Everything That I Know About Sonic the Hedgehog's Source Code

Clownacy · Apr 1, 2022

(This is another cross-post from my blog, duplicated here because it's relevant, and for preservation in case the blog ever disappears).

I've been meaning to write this for years:

To my understanding, not much is commonly known about the source code of the original Sonic the Hedgehog games. As someone who's been obsessed with the programming of these games for almost ten years, I believe that I know a lot more than most people do. Unfortunately, my memory is awful, and I'm not going to be a Sonic hacker forever, so I want to preserve this information however I can before it's lost again.

As of writing, the source code for the 'classic' Mega Drive Sonic the Hedgehog games has never been found. We do have an exhaustive list of disassemblies, however those do not capture all information that proper source code would give us. For example, while the logic of code is recovered by these disassemblies, the meaning of it might not be. Sometimes, the logic isn't all you need to understand code: it may do something that seems pointless or nonsensical, leaving nearby labels and comments to explain it fully. However, a disassembly cannot reproduce the original labels and comments: those are lost. Likewise, a disassembly cannot reproduce code that was never in the ROM to begin with, such as disabled (or "commented-out") prototype code. Because of this, a disassembly cannot truly replace source code.

However, small snippets of source code have surfaced over the years. The most obvious example I can think of is a fully-intact copy of a single source file (likely "EDIT.ASM") in Sonic 2's "Nick Arcade" prototype.

Sonic 2 "Nick Arcade" prototype's source file
Inside one of Sonic 2's prototypes is a fully intact copy of the source file responsible for the game's "edit mode" (commonly known as "debug mode"):
Code:
        addsym
        nolist
        include "equ.lib"
        include "macro.lib"
        list

        xref    colichgpat
        xref    ringpat,itempat,butapat,kanipat,hachipat,togepat
        xref    fishpat,fish2pat,mogurapat,shimapat2,jyamapat
        xref    musipat,sjumppat,kamerepat,arumapat,kagebpat,ballpat
        xref    firepat,fblockpat,signalpat,bobinpat,yoganpat,yogan2pat
        xref    usapat,yadopat,boxpat,bryukapat,daipat,break2pat,yogancpat
        xref    batpat,z5daipat,dai2pat,switch2pat,z4daipat
        xref    elevpat,pedalpat,steppat,funpat,sisoopat,hassyapat
        xref    brobopat,unipat,yaripat,udaipat,dai3pat,kazaripat,kassyapat
        xref    awapat,mizupat,boupat,benpat,fetamapat,mawarupat,hagurumapat
        xref    patapat,yukafpat,nokopat,dai4pat,doorpat,yukaepat,fire6pat
        xref    elepat,yukaipat,scolipat,imopat,savepat,bigringpat,btenpat
        xref    actionsub,actwkchk,frameout,playpat,dualmodesub
        xref    flicpat,usagipat,pengpat,azarpat,fbutapat,niwapat,risupat

        xref    kaitenpat,prodaipat,buranko0dpat
        xref    frntlitpat,gempat,wfallpat,pltfrmpat
        xref    takipat,banepat,dai00pat

        xref    redzpat,bfishpat,seahorsepat,horsepat
        xref    stegopat,wasppat,gatorpat,bbatpat,octpat,wfish2pat,snailpat

        xdef    edit

;------------------------------------------------------------------------------
edit:
        moveq   #0,d0
        move.b  editmode,d0
        move.w  edit_move_tbl(pc,d0.w),d1
        jmp     edit_move_tbl(pc,d1.w)
edit_move_tbl:
        dc.w    editinit-edit_move_tbl
        dc.w    editmove-edit_move_tbl
editinit:
        addq.b  #word,editmode
        move.w  scralim_up,editstack
        move.w  scralim_n_down,editstack2
        move.w  #$0000,scralim_up
        move.w  #$0720,scralim_n_down
        andi.w  #$07ff,playerwk+yposi
        andi.w  #$07ff,scra_v_posit
        andi.w  #$03ff,scrb_v_posit
        move.b  #0,patno(a0)
        move.b  #0,mstno(a0)
        cmpi.b  #spgamemd,gmmode
        bne.b   .jump0
*       move.b  #7-1,stageno
*       move.w  #$000,rotspd
*       move.w  #$000,rotdir
        moveq   #7-1,d0
        bra.b   .jump1
.jump0:
        moveq   #0,d0
        move.b  stageno,d0
.jump1:
        lea     edittbl,a2
        add.w   d0,d0
        adda.w  (a2,d0.w),a2
        move.w  (a2)+,d6
        cmp.b   editno,d6
        bhi.b   .jump
        move.b  #0,editno
.jump:
        bsr.w   editpatchg
        move.b  #12,edittimer
        move.b  #1,edittimer+1
editmove:
        moveq   #7-1,d0
        cmpi.b  #spgamemd,gmmode
        beq.b   .jump
        moveq   #0,d0
        move.b  stageno,d0
.jump:
        lea     edittbl,a2
        add.w   d0,d0
        adda.w  (a2,d0.w),a2
        move.w  (a2)+,d6
        bsr.w   editwalk
*       bsr.w   dirsprset
        jmp     actionsub
editwalk:
        moveq   #0,d4
        move.w  #1,d1
        move.b  swdata1+1,d4
        andi.w  #$0f,d4
        bne.b   .jump0
        move.b  swdata1,d0
        andi.w  #$0f,d0
        bne.b   .jump
        move.b  #12,edittimer
        move.b  #$0f,edittimer+1
        bra.w   .lend
.jump:
        subq.b  #1,edittimer
        bne.b   .jump1
        move.b  #1,edittimer
        addq.b  #1,edittimer+1
*       cmpi.b  #255,edittimer+1
        bne.b   .jump0
        move.b  #255,edittimer+1
.jump0:
        move.b  swdata1,d4
.jump1:
        moveq   #0,d1
        move.b  edittimer+1,d1
        addq.w  #1,d1
        swap    d1
        asr.l   #4,d1
        move.l  yposi(a0),d2
        move.l  xposi(a0),d3
        btst.l  #0,d4                   *swdata+0
        beq.b   .jump2
        sub.l   d1,d2                   *yposi
        bcc.b   .jump2
        moveq   #0,d2
.jump2:
        btst.l  #1,d4                   *swdata+0
        beq.b   .jump3
        add.l   d1,d2                   *yposi
        cmpi.l  #$7ff0000,d2
        bcs.b   .jump3
        move.l  #$7ff0000,d2
.jump3:
        btst.l  #2,d4                   *swdata+0
        beq.b   .jump4
        sub.l   d1,d3                   *xposi
        bcc.b   .jump4
        moveq   #0,d3
.jump4:
        btst.l  #3,d4                   *swdata+0
        beq.b   .jump5
        add.l   d1,d3                   *xposi
.jump5:
        move.l  d2,yposi(a0)
        move.l  d3,xposi(a0)
.lend:
        btst.b  #6,swdata1+0
        beq.b   .jump7
        btst.b  #5,swdata1+1            * c button check
        beq.b   .jump77
        subq.b  #1,editno
        bcc.b   .jump6
        add.b   d6,editno
        bra.b   .jump6
.jump77:
        btst.b  #6,swdata1+1
        beq.b   .jump7
        addq.b  #1,editno
        cmp.b   editno,d6
        bhi.b   .jump6
        move.b  #0,editno
.jump6:
        bra.w   editpatchg
.jump7:
        btst.b  #5,swdata1+1            * c button check
        beq.b   .jump8
        jsr     actwkchk
        bne.b   .worknai                ;z=0:ok z=1:no
        move.w  xposi(a0),xposi(a1)
        move.w  yposi(a0),yposi(a1)
        move.b  patbase(a0),actno(a1)
        move.b  actflg(a0),actflg(a1)
        move.b  actflg(a0),cddat(a1)
        andi.b  #$7f,cddat(a1)
        moveq   #0,d0
        move.b  editno,d0
        lsl.w   #3,d0
        move.b  4(a2,d0.w),userflag(a1)
        rts
.worknai:
.jump8:
        btst.b  #4,swdata1+1            * b button check
        beq.b   .jump9
        moveq   #0,d0
        move.w  d0,editmode
        move.l  #playpat,playerwk+patbase
        move.w  #$0780,playerwk+sproffset
        tst.w   dualmode                ; dual mode check
        beq.b   .end
        move.w  #$0780/2,playerwk+sproffset
.end:
        move.b  d0,playerwk+mstno
        move.w  d0,xposi+2(a0)
        move.w  d0,yposi+2(a0)
        move.w  editstack,scralim_up
        move.w  editstack2,scralim_n_down
        cmpi.b  #spgamemd,gmmode
        bne.b   .jump9
*       clr.w   rotdir
*       move.w  #$040,rotspd
*       move.l  #playpat,playerwk+patbase
*       move.w  #$0780,playerwk+sproffset
        move.b  #02,playerwk+mstno
        bset.b  #cd_ball,playerwk+cddat
        bset.b  #cd_jump,playerwk+cddat
.jump9:
        rts
editpatchg:
        moveq   #0,d0
        move.b  editno,d0
        lsl.w   #3,d0
        move.l  0(a2,d0.w),patbase(a0)
        move.w  6(a2,d0.w),sproffset(a0)
        move.b  5(a2,d0.w),patno(a0)
*       move.b  4(a2,d0.w),userflag(a0)
        bsr.w   dualmodesub
        rts

dcblw   macro   \1,\2,\3,\4,\5
        dc.l    (\1)*$1000000+(\2)
        dc.w    (\4)+(\5)*$100
        dc.w    (\3)
        endm

edittbl:
        dc.w    edit1tbl-edittbl
        dc.w    edit2tbl-edittbl
        dc.w    edit3tbl-edittbl
        dc.w    edit4tbl-edittbl
        dc.w    edit5tbl-edittbl
        dc.w    edit6tbl-edittbl
        dc.w    edit7tbl-edittbl
edit1tbl:
        dc.w    14
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   kani_act,kanipat,$0400,0,$00            ;3:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;4:
        dcblw   fish_act,fishpat,$0470,0,$00            ;5:
        dcblw   toge_act,togepat,$04a0,0,$00            ;6:
        dcblw   shima_act,shimapat2,$4000,0,$00         ;7:
        dcblw   jyama_act,jyamapat,$66c0,0,$00          ;8:
        dcblw   musi_act,musipat,$04e0,0,$00            ;9:
        dcblw   sjump_act,sjumppat,$04a8,0,$00          ;10:
        dcblw   kamere_act,kamerepat,$249b,0,$00        ;11:
        dcblw   kageb_act,kagebpat,$434c,0,$00          ;12:
        dcblw   save_act,savepat,$26bc,0,$01            ;13:
        dcblw   colichg_act,colichgpat,$26bc,0,$00      ;14:

edit2tbl:
edit3tbl:
;zone0d
        dc.w    07
        dcblw   ring_act,ringpat,$26bc,0,$00            ;01:
        dcblw   item_act,itempat,$0680,0,$00            ;02:
        dcblw   sjump_act,sjumppat,$04a8,0,$00          ;03:
        dcblw   colichg_act,colichgpat,$07bc,0,$00      ;04:
        dcblw   kaiten_act,kaitenpat,$e000,0,$00        ;05:
        dcblw   prodai_act,prodaipat,$e418,0,$00        ;06:
        dcblw   buranko_act,buranko0dpat,$2418,0,$08    ;07:

edit4tbl:
;zone00
        dc.w    18
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   save_act,savepat,$047c,0,$01            ;3:

        dcblw   colichg_act,colichgpat,$26bc,0,$00      ;6:
        dcblw   taki_act,takipat,$23ae,0,$00            ;7:
        dcblw   taki_act,takipat,$23ae,3,$02            ;7:
        dcblw   shima_act,dai00pat,$4000,0,$01          ;8:
        dcblw   shima_act,dai00pat,$4000,1,$0a          ;8:
        dcblw   toge_act,togepat,$2434,0,$00            ;10:
        dcblw   sisoo_act,sisoopat,$03ce,0,$00          ;9:

        dcblw   sjump_act,banepat,$045c,0,$80           ;3: banev
        dcblw   sjump_act,banepat,$0470,3,$90           ;3: baneh
        dcblw   sjump_act,banepat,$045c,6,$a0           ;3: banevr
        dcblw   sjump_act,banepat,$043c,7,$30           ;3: bane45
        dcblw   sjump_act,banepat,$043c,10,$40          ;3: bane45r

        dcblw   wasp_act,wasppat,$03e6,0,$00            ;25   ""    ""
        dcblw   snail_act,snailpat,$0402,0,$00          ;25   ""    ""
        dcblw   wfish2_act,wfish2pat,$041c,0,$00        ;21   ""    ""



        dcblw   redz_act,redzpat,$0500,0,$00            ;20: will change
        dcblw   bfish_act,bfishpat,$2530,0,$00          ;21   ""    ""
        dcblw   seahorse_act,horsepat,$2570,0,$00       ;22   ""    ""
        dcblw   skyhorse_act,horsepat,$2570,0,$00       ;23   ""    ""
        dcblw   stego_act,stegopat,$23c4,0,$00          ;24   ""    ""
        dcblw   wasp_act,wasppat,$032c,0,$00            ;25   ""    ""
        dcblw   gator_act,gatorpat,$2300,0,$00          ;26   ""    ""
        dcblw   bbat_act,bbatpat,$2350,0,$00            ;27   ""    ""
        dcblw   oct_act,octpat,$238a,0,$00              ;28   ""    ""

edit5tbl:
edit6tbl:
edit7tbl:
;zone08
        dc.w    15
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:

        dcblw   bgspr_act,frntlitpat,$e485,3,$21        ;3:
        dcblw   wfall_act,wfallpat,$e415,4,$04          ;4:
        dcblw   break_act,pltfrmpat,$4475,0,$00         ;5:
        dcblw   colichg_act,colichgpat,$26bc,0,$00      ;6:

        dcblw   redz_act,redzpat,$0500,0,$00            ;20: will change
        dcblw   bfish_act,bfishpat,$2530,0,$00          ;21   ""    ""
        dcblw   seahorse_act,horsepat,$2570,0,$00       ;22   ""    ""
        dcblw   skyhorse_act,horsepat,$2570,0,$00       ;23   ""    ""
        dcblw   stego_act,stegopat,$23c4,0,$00          ;24   ""    ""
        dcblw   wasp_act,wasppat,$032c,0,$00            ;25   ""    ""
        dcblw   gator_act,gatorpat,$2300,0,$00          ;26   ""    ""
        dcblw   bbat_act,bbatpat,$2350,0,$00            ;27   ""    ""
        dcblw   oct_act,octpat,$238a,0,$00              ;28   ""    ""

;------------------------------------------------------------------------------
        align
;------------------------------------------------------------------------------
        end


edit2tbl:
        dc.w    25
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;3:
        dcblw   fish2_act,fish2pat,$2486,0,$08          ;4:
        dcblw   mogura_act,mogurapat,$84a6,2,$00        ;5:
        dcblw   yari_act,yaripat,$03cc,0,$00            ;6:
        dcblw   yari_act,yaripat,$03cc,3,$02            ;7:
        dcblw   box_act,boxpat,$43de,0,$00              ;8:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;9:
        dcblw   toge_act,togepat,$051b,0,$00            ;10:
        dcblw   dai_act,udaipat,$43bc,0,$04             ;11:
        dcblw   dai3_act,dai3pat,$43e6,0,$01            ;12:
        dcblw   dai3_act,dai3pat,$43e6,1,$13            ;13:
        dcblw   dai3_act,dai3pat,$43e6,0,$05            ;14:
        dcblw   kazari_act,kazaripat,$443e,0,$00        ;15:
        dcblw   dai3_act,dai3pat,$43e6,2,$27            ;16:
        dcblw   dai3_act,dai3pat,$43e6,3,$30            ;17:
        dcblw   kassya_act,kassyapat,$03f6,0,$7f        ;18:
        dcblw   uni_act,unipat,$0467,0,$00              ;19:
        dcblw   awa_act,awapat,$8348,19,$84             ;20:
        dcblw   mizu_act,mizupat,$c259,2,$02            ;21:
        dcblw   mizu_act,mizupat,$c259,9,$09            ;22:
        dcblw   bou_act,boupat,$43de,0,$00              ;23:
        dcblw   ben_act,benpat,$4328,0,$02              ;24:
        dcblw   save_act,savepat,$26bc,0,$01            ;25:

*       dcblw   dai4_act,dai4pat,$41f0,4,$80            ;25:
edit3tbl:
        dc.w    18
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;3:
        dcblw   toge_act,togepat,$051b,0,$00            ;4:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;5:
        dcblw   mfire_act,firepat,$0345,0,$00           ;6:
        dcblw   fblock_act,fblockpat,$4000,0,$00        ;7:
        dcblw   myogan_act,yoganpat,$63a8,0,$00         ;8:
        dcblw   yogan2_act,yogan2pat,$63a8,0,$00        ;9:
        dcblw   box_act,boxpat,$42b8,0,$00              ;10:
        dcblw   yado_act,yadopat,$247b,0,$00            ;11:
        dcblw   bryuka_act,bryukapat,$42b8,0,$00        ;12:
        dcblw   dai_act,daipat,$02b8,0,$00              ;13:
        dcblw   break2_act,break2pat,$62b8,0,$00        ;14:
        dcblw   yoganc_act,yogancpat,$8680,0,$00        ;15:
        dcblw   bat_act,batpat,$04b8,0,$00              ;16:
        dcblw   imo_act,imopat,$24ff,0,$00              ;17:
        dcblw   save_act,savepat,$26bc,0,$01            ;18:
edit4tbl:
        dc.w    15
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   elev_act,elevpat,$4000,0,$00            ;3:
        dcblw   break2_act,break2pat,$44e0,2,$00        ;4:
        dcblw   shima_act,z4daipat,$4000,0,$00          ;5:
        dcblw   pedal_act,pedalpat,$4000,0,$00          ;6:
        dcblw   step_act,steppat,$4000,0,$00            ;7:
        dcblw   fun_act,funpat,$43a0,0,$00              ;8:
        dcblw   sisoo_act,sisoopat,$0374,0,$00          ;9:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;10:
        dcblw   mfire_act,firepat,$0480,0,$00           ;11:
        dcblw   bgspr_act,hassyapat,$44d8,0,$00         ;12:
        dcblw   brobo_act,brobopat,$0400,0,$00          ;13:
        dcblw   uni_act,unipat,$2429,0,$00              ;14:
        dcblw   save_act,savepat,$26bc,0,$01            ;15:
edit5tbl:
        dc.w    15
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   toge_act,togepat,$051b,0,$00            ;3:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;4:
        dcblw   aruma_act,arumapat,$04b8,0,$00          ;5:
        dcblw   signal_act,signalpat,$0000,0,$00        ;6:
        dcblw   bobin_act,bobinpat,$0380,0,$00          ;7:
        dcblw   kani_act,kanipat,$0400,0,$00            ;8:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;9:
        dcblw   yado_act,yadopat,$247b,0,$00            ;10:
        dcblw   shima_act,z5daipat,$4000,0,$00          ;11:
        dcblw   dai2_act,dai2pat,$4000,0,$00            ;12:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;13:
        dcblw   imo_act,imopat,$24ff,0,$00              ;14:
        dcblw   save_act,savepat,$26bc,0,$01            ;15:
edit6tbl:
        dc.w    29
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   brobo_act,brobopat,$0400,0,$00          ;3:
        dcblw   uni_act,unipat,$0429,0,$00              ;4:
        dcblw   imo_act,imopat,$22b0,0,$00              ;5:
        dcblw   buranko_act,fetamapat,$4391,2,$07       ;6:
        dcblw   haguruma_act,hagurumapat,$c344,00,$e0   ;7:
        dcblw   dai_act,daipat,$22c0,2,$28              ;8:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;9:
        dcblw   pata_act,patapat,$4492,0,$03            ;10:
        dcblw   pata_act,yukafpat,$04df,0,$83           ;11:
        dcblw   noko_act,nokopat,$43b5,0,$02            ;12:
        dcblw   break2_act,break2pat,$43f5,0,$00        ;13:
        dcblw   dai_act,daipat,$4460,3,$39              ;14:
        dcblw   dai4_act,dai4pat,$22c0,0,$00            ;15:
        dcblw   door_act,doorpat,$42e8,0,$00            ;16:
        dcblw   dai4_act,dai4pat,$22c0,1,$13            ;17:
        dcblw   noko_act,nokopat,$43b5,0,$01            ;18:
        dcblw   dai4_act,dai4pat,$22c0,1,$24            ;19:
        dcblw   noko_act,nokopat,$43b5,2,$04            ;20:
        dcblw   dai4_act,dai4pat,$22c0,1,$34            ;21:
        dcblw   yukae_act,yukaepat,$44c3,0,$00          ;22:
        dcblw   fire6_act,fire6pat,$83d9,0,$64          ;23:
        dcblw   fire6_act,fire6pat,$83d9,11,$64         ;24:
        dcblw   ele_act,elepat,$047e,0,$04              ;25:
        dcblw   yukai_act,yukaipat,$42f0,0,$00          ;26:
        dcblw   scoli_act,scolipat,$8680,0,$11          ;27:
        dcblw   buta_act,butapat,$2302,0,$04            ;28:
        dcblw   save_act,savepat,$26bc,0,$01            ;29:

*       dcblw   ring_act,playpat,$0780,50,$00           ;28:
*       dcblw   usa_act,usapat,$0448,0,$00              ;5:
*       dcblw   mawaru_act,mawarupat,$4348,16,$00       ;7:

edit7tbl:
        dc.w    02      *13
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   ring_act,ringpat,$26bc,8,$00            ;2:
*       dcblw   bobin_act,bobinpat,$0380,0,$00          ;2:
*       dcblw   usagi_act,flicpat,$05a0,0,$0a           ;3
*       dcblw   usagi_act,flicpat,$05a0,0,$0b           ;4
*       dcblw   usagi_act,flicpat,$05a0,0,$0c           ;5
*       dcblw   usagi_act,usagipat,$0553,0,$0d          ;6
*       dcblw   usagi_act,usagipat,$0553,0,$0e          ;7
*       dcblw   usagi_act,pengpat,$0573,0,$0f           ;8
*       dcblw   usagi_act,pengpat,$0573,0,$10           ;9
*       dcblw   usagi_act,azarpat,$0585,0,$11           ;10
*       dcblw   usagi_act,fbutapat,$0593,0,$12          ;11
*       dcblw   usagi_act,niwapat,$0565,0,$13           ;12
*       dcblw   usagi_act,risupat,$05b3,0,$14           ;13
This source code contains everything: code, comments, labels, and even disabled prototype code that we never knew even existed before. Notably, these labels give the internal names of enemies and objects used throughout the game, while the comments elaborate on the intended level order. The source code snippet even gives some insight into the exact assembler used to build the source code into a ROM.

That's not the only useful data in this prototype however...

Sonic 2 "Nick Arcade" prototype's symbol list
Starting at ROM address 0x418A8 is what appears to be a partial copy of the assembler's symbol table. Oddly, it doesn't appear to match the ROM, as labels that appear in the above source code are recorded in this symbol table at different addresses to where they are in the actual ROM. It can be assumed, based on this, that this symbol table is leftover from a previous execution of the assembler, rather than the one that produced the ROM that we have.

From roughly 0x418A8 to 0x47B14, the symbol table follows this format:

The first four bytes denote the length of the symbol identifier divided by four, and rounded up. That is to say, it denotes the number of longwords needed to hold the identifier. Notably, this length is stored in big-endian format.

The following longwords contain the label. Unused bytes are set to 00.

The following four bytes contain the value that is assigned to that symbol. This value is also in big-endian.

Here's an example:

00 00 00 02 65 64 69 74 69 6E 69 74 00 01 AB 12

The first four bytes are 00000002, indicating an identifier that is 2 longwords (or 8 bytes) long.

The next eight bytes are 65646974696E6974. When interpreted as ASCII, it is "editinit", which is one of the labels seen in the above source code.

The following four bytes are 0001AB12, which is the ROM address that was assigned to this label when the assembler that produced this symbol table was ran. In the ROM we have, however, "editinit" is located at 0001BABE.

Past 0x47B14, the format of the symbol table changes. Unfortunately, the entries don't seem to specify what each symbol's value is, instead containing what appears to be three pointers. This format continues to 0x50000, when actual game data resumes.

The symbol table begins again at 0x50A9C, but in another format that seems to just contain identifiers and pointers.

[EDIT: I'm a dummy: apparently you *can* extract meaningful data from the later parts of the symbol table, as someone else was able to and produce this massive list.]

While the later symbols don't contain any useful information, they are still useful for determining the original names of various bits of code. For example, the label 'random' is certainly what we've been calling 'RandomNumber' in the Sonic 2 disassembly. Additionally, 'bgmset' and 'soundset' are more than likely 'PlayMusic' and 'PlaySound'. What's notable about that last one is that it answers the question of whether 'PlayMusic' really was intended to play music, since sometimes it's used to play sounds instead, which caused people to question whether it actually was a dedicated music-playing function, or simply a generic 'play something' function.

One might be wondering why there's an intact source file and a partial symbol table in the middle of a ROM. Well, the space that this data occupies is what would normally be padding: towards the end of the ROM, the game's data is spaced-out for some reason, leaving big gaps. My theory is that whatever tool the devs were using to produce the final ROM simply malloc'd a huge buffer, and pasted data where it was needed, never initialising the unused space. This resulted in the unused space containing garbage data, leftover in memory from other programs.

This isn't the only time that symbol data appears in a Sonic game:

Sonic & Knuckles Collection's symbol list
Unfortunately, I can't comment too much on this due to not having a copy of Sonic & Knuckles Collection on hand. However, this game contains another instance of symbol data, inside its main EXE.

For the most complete set of symbols, however, one need not look further than...

Sonic CD's unstripped ELF files
Sonic Gems is a compilation of various emulated classic Sonic titles. Its version of Sonic CD, however, is not emulated: rather, it is a port of Sonic CD's PC port.

One might be wondering how a game written in Motorola 68000 assembly could have ever been ported to anything with a different CPU architecture. The answer to that is that its code was machine-converted from assembly to C. Notably, this process preserved the original labels, and possibly even the original comments.

Within the files of Sonic Gems, you can find a series of ELF files, which parallel the DLL files of Sonic CD's original PC port. What's special about these ELF files is that they are unstripped, containing huge amounts of symbol data.

When loaded into something like IDA or Ghidra, this symbol data is taken advantage of while disassembling or decompiling the code. This reverse-engineered code will have its original labels intact, giving a great look into the original source code. Unfortunately, the code you'll be looking at is the disassembled/decompiled output of PowerPC/MIPS assembly which was generated from C which was converted from 68k assembly. That is to say, it's hideous and practically unreadable. Still, if you're able to draw parallels between this code and the original 68k assembly, you effectively have a pre-labelled disassembly.

These ELF files also contain some debug data, such as the paths of various source files. I was able to extract a bunch of them back in 2018:

C:\project\GEMS\application\SonicCD\src\ps2\main\DLLMAIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ACTION.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ACTSET.C
C:\project\GEMS\application\SonicCD\src\ps2\main\DAI_K.C
C:\project\GEMS\application\SonicCD\src\ps2\main\DAI_RD1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\DIRCOL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\DUMMY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\EDIT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\EMIE1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\EMIE1CG.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ENEMY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\EQU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ET1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ETC.C
C:\project\GEMS\application\SonicCD\src\ps2\main\FCOL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\GAME.C
C:\project\GEMS\application\SonicCD\src\ps2\main\GOAL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\IO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ITEM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLAYER.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLAYPAT1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLAYSP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLAYSUB.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLCHG.C
C:\project\GEMS\application\SonicCD\src\ps2\main\RIDECHK.C
C:\project\GEMS\application\SonicCD\src\ps2\main\RING.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SCORE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SCRCHK.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPRING.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SUICIDE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TAKI.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TBL0.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TBL1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TREE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ZONE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\ZONETBL1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\ACT11A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\COL1A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV11A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL11A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KOWASI1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR11A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZURE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR11A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SHOOT1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SIKAKE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z11ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\BLOCK.C
C:\project\GEMS\application\SonicCD\src\ps2\main\LOADER2.C
C:\project\GEMS\application\SonicCD\src\ps2\main\BMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\COLI1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z11ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SAVE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\FRIEND1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\MOVIE1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\ACT11B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\COL1B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV11B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL11B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR11B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR11B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z11BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV11C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR11C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z11CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL11C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR11C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\COL1C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV11D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL11D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR11D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z11DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\COL1D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR11D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\ACT12A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV12A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL12A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR12A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\BRANKO1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR12A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z12ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z12ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV12B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL12B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR12B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR12B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z12BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV12C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL12C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR12C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR12C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z12CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV12D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL12D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\KUZUR12D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR12D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z12DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\ACT13C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV13C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\EDTBL13C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR13C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z13ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z13CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\BOSS_1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\DEV13D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\SCR13D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R1\Z13DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\BANPA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\BOBIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\BOBINB.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\COLI3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL31A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ET3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\FRIEND3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\GA3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\PLAYSP3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\POCKET.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\TOGEBL3A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\TRAP_R3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z31ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\MIRACLE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\COL3A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR31A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z31ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV31A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ACT31A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\MECASNC.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\MSNCCG.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\TENTOU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\KAMA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLPAT6.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\MOVIE3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ZONETBL3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ACT31B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\COL3B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV31B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL31B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z31BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR31B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\TOGEBL3B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\COL3C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV31C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL31C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z31CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR31C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\TOGEBL3D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\COL3D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV31D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL31D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z31DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR31D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV32A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL32A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z32ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z32ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR32A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ACT32A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV32B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL32B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z32BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR32B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV32C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL32C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z32CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR32C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV32D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL32D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z32DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR32D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ACT33C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV33C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\EDTBL33C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z33CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z33ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SIKAKE33.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\LIGHT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\STOPPER.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\BOSS_3.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\GATE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\ROLLPLAT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR33C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\DEV33D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\Z33DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R3\SCR33D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\ACT41A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\COL4A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\COLI4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\DEV41A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\EDTBL41A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\ET4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\SCR41A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\SCRCHK4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\SW4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\SWBLK4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\Z41ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\Z41ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\ZONETBL4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\GAME4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\PLAYSUB4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\AWA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\HARID4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\TOBIRA4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\HARIR4.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R4\WALLS.C
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C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV71D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR71D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z71DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR72A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z72ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV72A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z72ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV72B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR72B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z72BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV72C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR72C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z72CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV72D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR72D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z72DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR73C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\ACT73.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\EDTBL73.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z73ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\GAITOU73.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\WALL73.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\EMIE7.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z73CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV73C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\HARI73.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\EMIE7CG.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\BOSS_7.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\SCR73D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\DEV73D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R7\Z73DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\PLPAT8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\ACT81A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\COL8A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\COLI8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV81A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\EDTBL81.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR81A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z81ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z81ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\ZONETBL8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\TRAP_R81.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\KABUTO8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\KOMA8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SW8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\OKUSIESO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\TOBIRA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\KONBEA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCARAB.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\KUZURE8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\NOKOGIRI.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\PROPERA8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DAI8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\HACHI8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\ET8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\FRIEND8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\PISTON.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\HAGURUMA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCRCHK8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\COL8B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR81B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z81BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV81B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\COL8C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR81C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z81CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV81C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\COL8D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR81D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z81DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV81D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\PLAYSP8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\ACT82A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\EDTBL82.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\TRAP_R82.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z82ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z82ATBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\BEAM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SHUT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV82A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SHOOT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DANGO8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\LEGMECA8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\BIGBOM8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR82A.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\JETTOGE8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\PIPE8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV82B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR82B.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z82BTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV82C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR82C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z82CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV82D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR82D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z82DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\EDTBL83.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR83C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z83ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z83CTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\BOSS_8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV83C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\ACT83.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\EMIE8.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\KONBEA83.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\TRAP_R83.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\HOTA8C.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\DEV83D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\SCR83D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\Z83DTBL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\R8\HOTA8D.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\ACT_S.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\BACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\BMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\COLI_S.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\COMMON.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\DATA_S1.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\ENS.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\ETC_M.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\ETC_S.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\FADEIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\GAME.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\KAITEN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\PLS.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\SPM_EQU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\SPS_EQU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\SPECIAL\SIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\AVIGOOD\AVIGODDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\AVIGOOD\AVIGODEN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\AVIOPEN\AVIOPNDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\AVIOPEN\AVIOPNEN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTITEM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\BESTTIME\BESTSPRT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\COMMON\HMX_OEEACTL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\OPENING\OPNBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\OPENING\OPNDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\OPENING\OPNENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\OPENING\OPNGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\OPENING\OPNPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\ACTM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\ASCIISET.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\ASCMAP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\CHAMOV.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\DATA_M.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\ETC.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\FLASH.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\KAITEN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\LPLMAIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\PALET.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\PLM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\PLS.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\SPM_EQU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\PLANET\SPS_EQU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDEDIT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDFILE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDMENU.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SAVEDATA\SVDSPRT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\SOUNDTST\SNDSPRT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGITEM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\STAGETST\STGSPRT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\TA\TA.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\TA\FADEIN.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\TA\TACOLOR.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\TA\TAEACTRL.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\ACT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\BM_M.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\CHRSET.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\DATA_SP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\ETC_M.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\FADE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\GAME.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\IO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\SPM.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\THANKS\SPRMOVE.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDBMP.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDDO.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDENTRY.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDGRID.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDPALT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\TITLE\VISUALMD\VMDSPRT.C
C:\project\GEMS\application\SonicCD\src\ps2\main\WARP\WARP.C

This file list gives you a look at the layout of Sonic CD's source code. Notably, you can see 'EDIT.C', which is very likely the file that originally contained the code seen in Sonic 2's "Nick Arcade" prototype.

Sonic Gems isn't the only game to contain unstripped executables like this. For instance, The Legend of Zelda Collector's Edition contains an unstripped executable for its Nintendo 64 emulator (or "simulator", as it calls itself. Yeah, sure, Nintendo).

Yuji Naka's video
A few years back, Yuji Naka found some old footage of him working on Sonic 1 back in February 1990. In this video, he scrolls through a portion of the game's source code, giving us yet another sighting of authentic source code:

Sonic hackers looked into this footage, and were able to produce a transcription of the source code, 'FCOL3.ASM':
Code:
*cd_walk            equ 0*2
*cd_jump            equ 1*2
*cd_up              equ 2*2
*cd_down            equ 3*2

updotmax        equ -4
downdotmax      equ 4
jumpdotmax      equ 8

;sprvo          equ $1c
;sprho          equ $1d
;sprvs          equ $1e
;sprhs          equ $1f
;------------------------------------------------------------------------
;   foot colition
;
;col:
    move.w  yposi(a0),d4
    move.b  sprvo(a0),d1
    add.b   sprvs(a0),d1
    ext.w   d1
    add.w   d1,d4
    move.w  xposi(a0),d5
    move.b  sprho(a0),d1
    ext.w   d1
    add.w   d1,d5
    move.w  xspeed(a0),scrhithz
?loop:
    move.w  d4,d2
    move.w  d5,d3
    moveq   #0,d0
    move.b  sprhs(a0),d0
    tst.w   xspeed(a0)
    bpl.b   ?jump
*   btst.b  #cd_right,cddot(a0)
*   beq.b   ?jump
    neg.w   d0
?jump:
    add.w   d0,d3
    bsr.w   scdchk
    tst.w   d1
    beq.b   ?end
    bpl.b   ?down
?up:
    cmp.w   #updotmax,d1
    blt.b   ?nomove
    add.w   d1,yposi(a0)
?end:
    rts
?nomove:
    bsr.b   hoseihsub
    bra.b   ?loop
    move.w  #0,xspeed(a0)
    rts
?down:
    move.w  d1,d6
    swap    d6
?down2:
    move.w  d4,d2
    move.w  d6,d3
    moveq   #0,d0
    move.b  sprhs(a0),d0
    tst.w   xspeed(a0)
    bpl.b   ?jump3
*   btst    #cd_left,cddot(a0)
*   bne.s   ?jump3
    neg.w   d0
?jump3:
    add.w   d0,d3
    bsr.w   scdchk
    tst.w   d1
    beq.b   ?end2
    bpl.b   ?down1
?up2:
    cmp.w   #updotmax,d1
    blt.b   ?nomove2
Also visible in the footage was a brief glance of a partial file list:
Code:
                        ENEMY.ASM
            FCOL.ASM    FCOL.BAK
FCOL3.ASM   GAME.ASM    INT.ASM
LOGO.ASM    MACRO.LIB   MAIN.ASM
ML.EVT      ML.S28      OBJ¥
S           S.CMD       SCORE.ASM
SOUND¥      TR¥
Some of these filenames may seem familiar, as they survived into Sonic CD. Note that the items ending with the Yen symbol are actually directories, and not files.

This footage is also noteworthy for showing that Sonic 1 was developed on DOS. This is something that I'll come back to later.

Patent US5411272A
A tiny snippet of source code can be found in a patent that Sega filed around the time of Sonic 2's release. It contains two tables that are responsible for Emerald Hill Zone's spiral loops. While it's not all that insightful, it does give you a look at the original formatting of these tables, and how the data was grouped.

J2ME
The developers of the J2ME version of Sonic 1 appear to have had access to Sonic 1's source code, or at least its assets: this is evident through how its filenames reflect labels found in the original source code. For instance, 'scdtblwk.scd', matches the label 'scdtblwk' that is found in Sonic 2's "Nick Arcade" prototype.

Most notably, however, some of the files in this version appear to be 'raw', unprocessed versions of the data found in the ROM of the Mega Drive version. For example, there's an unused function in Sonic 2 that converts the collision data from a previously-unknown format to the format that is seen in the ROM itself, and it was discovered that the collision files in the J2ME version are in this mysterious format.

There are other file format oddities as well, such as block priority being stored in its own file, instead of being embedded in the chunk data. It's possible that this too is how the data was originally formatted, before being converted into its final form for inclusion in the ROM.

Assembler
So we have all this information about the source code itself, and the game's assets, but what about the development environment? Well, for starters, from the footage we saw earlier, we can tell that Sonic 1 was developed on DOS computers.

According to LazloPsylus, Sonic 1 was very evidently assembled with the 2500AD assembler, X68k, based partly on the fact that the syntax of the code snippet seen in Yuji Naka's footage is unusual, and unlikely to have built with any other assembler.

However, it does not appear that Sonic 2 was assembled with X68k, as the "Nick Arcade" source code snippet uses a different syntax. It's plausible that Sonic 2 was assembled with SN 68k, also known as asm68k, however the presence of an 'addsym' directive, which is not supported by asm68k, calls this into question.

Further complicating matters is something that I discovered while writing this very blog post: the "Nick Arcade" symbol table uses big-endian integers. DOS PCs are x86, and store their integers in little-endian. This suggests that Sonic 2 wasn't assembled on a DOS PC at all, unlike Sonic 1, and rather that it was assembled on a big-endian platform like a 68k-powered Macintosh. Another indication of this is that the "Nick Arcade" source snippet uses Unix-style line endings (0x0A), instead of DOS-style line endings (0x0D 0x0A).

There's some evidence to suggest that Sonic 2 used a different assembler between REV01 and REV02: cross-object-file function calls behave differently, 'dc.b' directives are automatically padded, some 'addi' and 'subi' instructions were optimised to 'addq' and 'subq' instructions, and some 'lea' instructions were unoptimised from PC-relative addressing to absolute long addressing. The cross-object-file behaviour of REV00 and REV01 matches that of the "Nick Arcade" prototype, so it can be assumed that Sonic 2 used the same assembler throughout development up until REV02.

Something I just discovered while writing this blog post is that Sonic 1's machine code is similar to Sonic 2 REV02: in code that is shared between Sonic 1 and Sonic 2, the same 'addi' and 'subi' instructions are 'addq' and 'subq' in both Sonic 1 and Sonic 2 REV02. Likewise, the same 'lea' instructions are unoptimised. With this in mind, it would appear that Sonic 2 was migrated back to X68k during the development of REV02, and it would continue to use this assembler as it was used to develop Sonic 3, Knuckles in Sonic 2, and the Mega Play arcade version of Sonic 2.

Sonic 2's source file boundaries
While we don't have an exact list of Sonic 2's source files, we do have a way of determining where its original source files began and ended: the assembler used by Sonic 2 before REV02 would resolve cross-object-file function calls in a clunky way, basically proxying them to little 'JmpTo' functions. To put it literally, a 'bsr' instruction that referenced a label which was outside of the current object file would instead branch to a single-instruction function that was appended to the end of the object file, which would itself jump to the 'bsr' instruction's original destination. Because these 'JmpTo' functions are inserted at the end of the object file, they can be used to tell where an object file (and thus a source file) ended.

From this, we can determine things like that the ring object (object 0x25), the scattered ring object (object 0x37), the big Special Stage ring object leftover from Sonic 1, and the Casino Night Zone ring prize object (object 0xDC) were all stored in the same source file.

Sonic 2 "Simon Wai" prototype's unassembled Kosinski file
Like the "Nick Arcade" prototype before it, Sonic 2's "Simon Wai" prototype includes another source code file. This one, however, is not entirely complete, but it contains more than enough useful information:
Code:
; 圧縮前 $8000  圧縮後 $2c00  圧縮率 34.4%  セル数 1024
   dc.b    $1d,$7f,$00,$ff,$f8,$7e,$04,$01,$fb,$02,$00,$03,$04,$05,$04,$80
   dc.b    $ff,$fa,$ff,$07,$54,$0b,$54,$0a,$50,$0c,$50,$ff,$8f,$0d,$54,$0f
   dc.b    $54,$0e,$50,$10,$50,$11,$52,$19,$52,$18,$ff,$ff,$fc,$1a,$52,$1b
   dc.b    $51,$8a,$51,$8b,$52,$1c,$02,$1e,$02,$1f,$02,$2a,$9f,$ff,$02,$2b
   dc.b    $01,$8c,$01,$8d,$f4,$1d,$02,$2c,$02,$2d,$01,$ff,$f4,$88,$01,$89
   dc.b    $01,$8e,$01,$8f,$02,$1a,$e4,$02,$2e,$02,$46,$c0,$2f,$e0,$ff,$1b
   dc.b    $ec,$fc,$dc,$00,$70,$02,$c4,$d4,$ee,$18,$02,$19,$01,$3f,$f6,$fd
   dc.b    $e4,$e6,$04,$2e,$04,$2d,$04,$9d,$fe,$77,$bd,$00,$be,$f9,$50,$31
   dc.b    $54,$30,$54,$2f,$7f,$f8,$56,$03,$56,$02,$56,$01,$05,$ff,$f0,$52
   dc.b    $1d,$52,$1e,$e1,$9f,$52,$1f,$fc,$50,$3e,$54,$3c,$56,$04,$54,$36
   dc.b    $09,$e0,$c4,$9c,$f8,$ea,$1a,$50,$48,$24,$41,$ba,$a4,$b2,$fc,$fc
   dc.b    $21,$9a,$f2,$80,$f6,$9c,$fc,$1d,$5e,$92,$68,$01,$8a,$01,$8b,$ee
   dc.b    $fc,$68,$f2,$fd,$d5,$fd,$ce,$f7,$f7,$80,$fd,$f0,$f8,$0f,$04,$35
   dc.b    $f0,$f8,$0d,$54,$3f,$54,$39,$7f,$fe,$54,$38,$01,$ff,$02,$00,$06
   dc.b    $00,$60,$1a,$54,$43,$54,$ff,$f3,$42,$55,$fe,$55,$fd,$55,$fc,$55
   dc.b    $fb,$54,$46,$a4,$1c,$ff,$11,$50,$49,$54,$44,$54,$52,$50,$51,$54
   dc.b    $50,$80,$b2,$12,$8e,$8f,$4e,$06,$fc,$f2,$f2,$3c,$90,$fa,$58,$5c
   dc.b    $80,$f8,$20,$60,$f8,$20,$40,$f3,$02,$0a,$02,$2c,$3c,$0b,$70,$40
   dc.b    $f6,$86,$2a,$54,$29,$52,$f4,$62,$f8,$11,$c0,$f1,$2a,$52,$2b,$bc
   dc.b    $f4,$fc,$1a,$62,$f1,$72,$6e,$f2,$f2,$78,$00,$16,$bd,$fe,$00,$17
   dc.b    $fc,$f8,$0c,$18,$00,$19,$fc,$f8,$0c,$e0,$f8,$2e,$54,$06,$54,$04
   dc.b    $50,$fb,$be,$08,$50,$09,$f8,$fe,$50,$12,$50,$13,$fc,$f8,$0b,$00
   dc.b    $14,$00,$15,$f7,$fc,$fc,$f8,$0c,$1e,$00,$1f,$fc,$f8,$0c,$20,$00
   dc.b    $21,$fc,$f4,$50,$f5,$f7,$07,$50,$f6,$50,$f7,$e8,$fe,$50,$f8,$50
   dc.b    $87,$52,$1b,$3c,$1f,$fd,$e0,$fc,$50,$f9,$50,$85,$40,$ae,$f1,$50
   dc.b    $fa,$50,$fb,$07,$e1,$50,$fc,$50,$8b,$f6,$86,$f1,$2a,$1c,$50,$2f
   dc.b    $b2,$8c,$50,$8d,$50,$8e,$24,$f1,$24,$ee,$0a,$24,$9a,$eb,$92,$f3
   dc.b    $7c,$f2,$0a,$f2,$e0,$ec,$af,$9f,$dc,$05,$6d,$ae,$ef,$60,$f2,$1a
   dc.b    $06,$25,$01,$89,$45,$94,$e4,$4e,$ed,$e0,$e8,$2a,$f3,$11,$ae,$e0
   dc.b    $f0,$c0,$28,$02,$29,$38,$f6,$00,$8c,$c0,$fd,$ce,$e4,$a0,$59,$44
   dc.b    $c0,$8d,$ce,$00,$ea,$bc,$e0,$0b,$a8,$d6,$fc,$1b,$dc,$e2,$f8,$f0
   dc.b    $68,$ec,$ea,$bd,$f8,$e5,$20,$f0,$15,$a0,$e8,$09,$20,$f0,$16,$50
   dc.b    $54,$0d,$20,$f5,$1b,$52,$1c,$92,$a0,$dc,$e4,$60,$e5,$a8,$6e,$e2
   dc.b    $80,$6e,$e4,$82,$28,$12,$fc,$4e,$e2,$80,$6e,$e2,$44,$ee,$e7,$fa
   dc.b    $00,$66,$8e,$fe,$56,$25,$51,$8c,$c0,$c2,$e4,$bc,$f0,$fe,$38,$02
   dc.b    $15,$d8,$80,$fc,$06,$f8,$9d,$59,$f0,$12,$02,$11,$02,$10,$80,$fc
   dc.b    $f6,$5a,$30,$fe,$e0,$ee,$13,$80,$2e,$52,$2f,$f9,$6d,$7f,$f5,$05
   dc.b    $f9,$02,$16,$00,$23,$00,$24,$e4,$f3,$f2,$f1,$80,$ea,$50,$2b,$20
   dc.b    $8c,$50,$76,$5a,$f3,$84,$51,$89,$40,$a0,$5c,$58,$60,$6e,$00,$f9
   dc.b    $11,$95,$ae,$f5,$1b,$5a,$f6,$6a,$e3,$6a,$fc,$02,$82,$e8,$10,$96
   dc.b    $ee,$ea,$47,$0f,$ce,$f2,$13,$02,$14,$76,$b2,$f2,$16,$02,$17,$44
   dc.b    $8c,$ee,$e4,$88,$ea,$33,$fa,$d4,$04,$23,$f2,$e4,$e6,$fc,$54,$27
   dc.b    $54,$4f,$e4,$94,$54,$93,$04,$92,$e0,$ea,$e4,$f2,$54,$af,$af,$85
   dc.b    $54,$97,$04,$98,$c6,$fd,$52,$f3,$54,$87,$54,$99,$bc,$fc,$ff,$ff
   dc.b    $00,$e8,$39,$50,$6b,$50,$6c,$50,$6d,$50,$73,$50,$74,$50,$75,$50
   dc.b    $76,$50,$ff,$8f,$77,$50,$78,$50,$79,$50,$15,$50,$7a,$50,$7b,$50
   dc.b    $7c,$5e,$51,$f8,$20,$ee,$12,$00,$13,$fc,$f8,$0c,$00,$e8,$0e,$08
   dc.b    $6e,$e2,$4d,$d2,$fc,$f2,$bc,$d2,$8a,$32,$ee,$f6,$60,$04,$f0,$fa
   dc.b    $22,$fa,$00,$23,$06,$5c,$32,$fc,$80,$f1,$26,$54,$25,$67,$c1,$50
   dc.b    $27,$f6,$58,$20,$80,$f2,$20,$60,$d1,$51,$55,$f1,$6d,$d8,$80,$f3
   dc.b    $cc,$f3,$28,$f1,$80,$f0,$09,$12,$dc,$2d,$a3,$04,$e1,$d8,$ea,$18
   dc.b    $84,$d6,$a0,$d8,$4f,$41,$80,$f4,$02,$25,$01,$24,$ae,$05,$c0,$80
   dc.b    $f4,$88,$23,$f0,$25,$92,$12,$05,$fa,$ab,$02,$d6,$e0,$ff,$92,$f3
   dc.b    $e0,$fc,$8a,$f1,$e0,$86,$a7,$88,$10,$88,$01,$f9,$01,$fa,$80,$5d
   dc.b    $21,$05,$fa,$60,$fc,$50,$28,$80,$fe,$e0,$e9,$fc,$2d,$1b,$94,$84
   dc.b    $bc,$c9,$52,$86,$c0,$ce,$64,$ea,$2a,$7c,$74,$19,$fa,$e9,$76,$d2
   dc.b    $58,$55,$05,$48,$01,$5d,$f9,$5e,$f2,$fc,$f4,$57,$05,$52,$85,$e9
   dc.b    $1b,$05,$49,$f4,$fe,$02,$d5,$ff,$f2,$f4,$f8,$09,$ff,$f8,$32,$32
   dc.b    $d6,$96,$ca,$ff,$d8,$38,$50,$39,$50,$3f,$a2,$49,$a2,$4a,$fc,$54
   dc.b    $ea,$fe,$7f,$af,$02,$0d,$02,$0e,$02,$0f,$06,$0d,$cc,$f8,$0a,$c1
   dc.b    $00,$c2,$bc,$f8,$0c,$d2,$f9,$f0,$f8,$2c,$c0,$e1,$f0,$07,$04,$05
   dc.b    $f1,$07,$51,$bf,$aa,$75,$50,$c1,$50,$c2,$54,$31,$a0,$c6,$ac,$da
   dc.b    $ee,$f5,$46,$f2,$aa,$20,$60,$f3,$e4,$f3,$dc,$de,$d2,$cc,$6e,$de
   dc.b    $d4,$52,$d8,$0c,$b2,$ac,$e2,$e8,$5c,$f3,$d8,$c8,$e2,$82,$b2,$20
   dc.b    $de,$34,$f3,$ec,$1a,$f2,$84,$db,$b8,$84,$6a,$e8,$fe,$c4,$b8,$c0
   dc.b    $b8,$49,$20,$fc,$c0,$b8,$10,$1b,$2d,$e8,$08,$f3,$00,$f1,$51,$fc
   dc.b    $da,$8a,$f2,$bd,$ae,$d7,$97,$01,$73,$06,$99,$fc,$fe,$98,$f6,$e4
   dc.b    $04,$0a,$fc,$f6,$f4,$9b,$7f,$46,$f6,$06,$9f,$02,$e2,$0a,$98,$0a
   dc.b    $f4,$e6,$38,$e9,$fe,$e3,$04,$00,$fa,$f4,$fc,$50,$f5,$93,$43,$e2
   dc.b    $06,$91,$02,$fe,$92,$f8,$f0,$07,$84,$98,$06,$96,$02,$fe,$b0,$f8
   dc.b    $91,$20,$06,$95,$f0,$c4,$fe,$9a,$8d,$87,$f8,$06,$9c,$f0,$e4,$02
   dc.b    $e5,$aa,$08,$fe,$02,$bc,$f8,$fa,$eb,$32,$50,$33,$50,$34,$9f,$ff
   dc.b    $50,$b4,$50,$b5,$50,$b6,$fc,$b7,$50,$b8,$50,$b9,$54,$e1,$fb,$b9
   dc.b    $f0,$fe,$ba,$f0,$bb,$f0,$bc,$68,$d2,$06,$19,$fc,$ff,$f4,$ae,$fc
   dc.b    $ad,$fc,$ac,$fc,$ab,$fc,$aa,$f0,$fc,$a6,$fc,$fb,$8b,$a5,$fc,$a4
   dc.b    $48,$d6,$30,$be,$3c,$a3,$3c,$a2,$38,$d0,$09,$c5,$56,$f0,$a1,$58
   dc.b    $c0,$0b,$f0,$a0,$f0,$f8,$0e,$9f,$40,$b0,$52,$58,$d5,$b5,$6e,$80
   dc.b    $f7,$58,$d5,$80,$f0,$0d,$f1,$72,$cc,$80,$f7,$01,$6d,$c0,$f8,$1e
   dc.b    $58,$45,$fd,$48,$f6,$bc,$fc,$c0,$c0,$ee,$9c,$ea,$18,$a1,$6d,$01
   dc.b    $4b,$f8,$48,$05,$55,$8e,$cc,$a6,$f0,$52,$05,$57,$d1,$a0,$05,$56
   dc.b    $ec,$38,$ea,$88,$a0,$32,$cb,$c0,$fe,$ec,$fe,$c6,$f0,$ec,$fe,$01
   dc.b    $1f,$02,$5d,$01,$ff,$bf,$0f,$01,$10,$02,$45,$02,$30,$02,$31,$c1
   dc.b    $da,$c2,$33,$c2,$32,$ff,$cf,$d2,$e2,$02,$34,$02,$35,$02,$32,$c1
   dc.b    $db,$c2,$3c,$02,$3d,$7f,$00,$f0,$47,$02,$36,$02,$37,$c1,$dc,$e0
   dc.b    $ea,$0e,$ff,$f0,$44,$ce,$c5,$d8,$c1,$d9,$02,$40,$02,$f0,$ff,$41
   dc.b    $f0,$c1,$d4,$c1,$d5,$c1,$d6,$c1,$d7,$02,$3e,$02,$ff,$3f,$3f,$02
   dc.b    $46,$c0,$c1,$c0,$c2,$c2,$3a,$c2,$3b,$02,$38,$02,$39,$01,$02,$d8
   dc.b    $f0,$d0,$c8,$02,$7e,$c0,$c4,$f8,$30,$01,$29,$01,$2a,$02,$44,$92
   dc.b    $d6,$aa,$c0,$a3,$aa,$80,$d3,$8b,$2e,$ca,$d3,$a0,$c9,$9a,$d2,$a4
   dc.b    $cd,$aa,$eb,$80,$cf,$a4,$cd,$66,$d2,$a8,$ce,$80,$d6,$04,$5e,$72
   dc.b    $ce,$60,$d5,$5d,$97,$f6,$54,$61,$54,$60,$e4,$fc,$ea,$52,$1c,$e0
   dc.b    $a9,$63,$54,$ff,$da,$62,$54,$67,$54,$66,$54,$65,$54,$64,$f2,$bc
   dc.b    $e0,$ac,$54,$e0,$a9,$7f,$e1,$51,$fb,$51,$fc,$51,$fd,$51,$fe,$80
   dc.b    $e8,$0f,$fc,$50,$ba,$5b,$50,$50,$bb,$50,$80,$e8,$14,$0c,$80,$e8
   dc.b    $0c,$f0,$80,$e8,$7b,$e0,$d8,$3f,$fd,$ef,$ec,$e9,$9a,$f2,$1e,$54
   dc.b    $9d,$54,$9c,$54,$90,$54,$8f,$92,$b7,$1c,$1f,$d5,$54,$8e,$54,$8d
   dc.b    $50,$50,$e0,$e8,$ba,$b2,$9e,$80,$9a,$aa,$aa,$1d,$9c,$bb,$c4,$da
   dc.b    $7c,$ea,$ba,$b2,$36,$db,$f8,$9d,$00,$be,$aa,$f4,$a0,$c8,$09,$8e
   dc.b    $a6,$0e,$a3,$92,$c6,$c0,$9a,$d4,$04,$24,$00,$c2,$ff,$5a,$32,$f0
   dc.b    $09,$e6,$54,$4f,$54,$4e,$54,$4d,$54,$4c,$54,$d5,$7e,$59,$54,$9c
   dc.b    $c3,$a8,$b1,$00,$ea,$1c,$80,$99,$57,$54,$56,$54,$5f,$11,$55,$60
   dc.b    $ff,$aa,$ea,$80,$9a,$a0,$fe,$06,$bc,$95,$54,$68,$d6,$5c,$d6,$12
   dc.b    $9c,$56,$dc,$e4,$9a,$ea,$84,$c4,$8f,$3f,$5c,$ac,$51,$09,$83,$f2
   dc.b    $62,$02,$63,$01,$88,$05,$7c,$a2,$f6,$51,$00,$91,$09,$24,$f2,$fc
   dc.b    $10,$25,$05,$64,$91,$f0,$96,$b2,$ee,$61,$1d,$92,$c1,$f2,$50,$91
   dc.b    $a8,$c2,$fc,$fe,$f0,$96,$ac,$b0,$f0,$48,$b1,$8d,$64,$e1,$20,$c3
   dc.b    $f0,$00,$9e,$8c,$aa,$92,$95,$78,$f2,$60,$f8,$09,$8e,$93,$92,$f3
   dc.b    $d1,$f5,$72,$90,$09,$1f,$36,$44,$ef,$00,$53,$40,$b1,$fa,$f1,$50
   dc.b    $4a,$ff,$ff,$50,$4b,$50,$4c,$50,$4d,$50,$4e,$50,$4f,$50,$55,$50
   dc.b    $56,$50,$57,$3d,$48,$50,$3d,$f8,$f5,$18,$50,$40,$f6,$fc,$f7,$2a
   dc.b    $a9,$2a,$20,$9a,$b6,$bb,$20,$90,$0a,$e8,$ee,$fe,$e8,$a4,$a4,$ff
   dc.b    $e4,$f4,$c6,$80,$de,$0e,$b5,$50,$46,$50,$47,$50,$48,$50,$3f,$c2
   dc.b    $3a,$50,$3b,$50,$42,$50,$43,$a0,$ff,$51,$5f,$55,$50,$52,$50,$44
   dc.b    $50,$45,$d8,$f1,$3c,$f2,$e4,$c3,$2e,$f8,$09,$a0,$8e,$95,$05,$a0
   dc.b    $fd,$80,$88,$0a,$e0,$ef,$0e,$b2,$c5,$ce,$55,$62,$00,$bb,$5c,$f8
   dc.b    $0a,$60,$f6,$5c,$8a,$3c,$5a,$2b,$2a,$d2,$fe,$01,$12,$a0,$09,$52
   dc.b    $f3,$f0,$5a,$f3,$8e,$fe,$30,$91,$f0,$b6,$f2,$ea,$8a,$32,$c0,$d1
   dc.b    $96,$fd,$2e,$bd,$f0,$b2,$fe,$12,$cb,$2c,$c0,$40,$fd,$0e,$a0,$5c
   dc.b    $8f,$be,$56,$a0,$a6,$4e,$a2,$51,$82,$b8,$09,$88,$a1,$53,$22,$b8
   dc.b    $2d,$c0,$82,$f5,$27,$f0,$f8,$0b,$a6,$b9,$c0,$81,$54,$34,$54,$33
   dc.b    $54,$32,$f0,$ed,$92,$40,$d1,$e0,$ea,$1a,$c0,$82,$54,$37,$c0,$81
   dc.b    $68,$68,$55,$72,$f2,$58,$aa,$81,$41,$00,$e0,$60,$8e,$b0,$0a,$c0
   dc.b    $80,$09,$7a,$b0,$0a,$bf,$28,$80,$c0,$40,$c0,$be,$cc,$a3,$cc,$00
   dc.b    $d8,$0a,$f0,$00,$d8,$0c,$8a,$ba,$f0,$00,$d8,$0c,$f0,$00,$d8,$0a
   dc.b    $88,$fe,$54,$b4,$7f,$fd,$cc,$f4,$f4,$bc,$f4,$bb,$f4,$ba,$f4,$80
   dc.b    $d1,$7c,$d1,$bf,$50,$c0,$f8,$ff,$fa,$aa,$f8,$ab,$f8,$ac,$f8,$ad
   dc.b    $f8,$ae,$d4,$91,$26,$b7,$f8,$b1,$f8,$fb,$dd,$b2,$f8,$b3,$16,$b0
   dc.b    $0b,$38,$af,$38,$b0,$30,$06,$b0,$0c,$38,$a9,$f0,$f8,$0e,$d6,$ed
   dc.b    $a8,$f0,$f8,$0e,$a7,$f0,$f8,$0d,$ff,$f8,$13,$f0,$d5,$f0,$f8,$0e
   dc.b    $d6,$f0,$f8,$0e,$d7,$fd,$ff,$05,$6e,$f2,$f8,$09,$f4,$d8,$f0,$d9
   dc.b    $55,$71,$55,$70,$55,$6f,$50,$dd,$7f,$7f,$f0,$de,$f0,$df,$f0,$e0
   dc.b    $f2,$18,$00,$f1,$72,$51,$73,$50,$ef,$f0,$d8,$f0,$ff,$f1,$f2,$00
   dc.b    $d9,$a2,$fe,$1f,$a1,$88,$7f,$70,$a1,$89,$a2,$2c,$a2,$2d,$a2,$1a
   dc.b    $f4,$f8,$c8,$67,$02,$59,$5d,$ef,$a0,$6c,$f0,$fe,$f2,$5a,$00,$d4
   dc.b    $9b,$f8,$4c,$2d,$00,$2e,$ac,$e8,$0a,$2f,$ff,$6d,$50,$30,$50,$31
   dc.b    $50,$36,$50,$37,$50,$3c,$40,$df,$1e,$40,$d9,$1b,$ad,$6a,$7c,$e7
   dc.b    $54,$e2,$8d,$88,$94,$f8,$d4,$a0,$8c,$92,$8e,$ee,$cb,$8f,$05,$19
   dc.b    $ee,$bf,$2a,$e2,$f4,$80,$88,$0a,$e6,$04,$14,$f2,$e0,$ba,$f6,$ee
   dc.b    $c0,$d3,$94,$f5,$e0,$c0,$d0,$15,$58,$85,$80,$84,$da,$
'Kosinski' is the nickname of a compression format used by various Mega Drive games, and this source file contains data compressed in this format. The header, when translated, says...
Code:
; Before compression $8000  After compression $2c00  Compression ratio 34.4%  Number of cells 1024
'Cells' refers to Mega Drive tile graphics, which are 32 bytes each. It doesn't make such sense in this context, since it's not tiles that are being compressed, but rather Aquatic Ruin Zone's level chunk data.

Anyway, what we can learn from this source file is that Kosinski-compressed data wasn't included into the ROM as binary data, but rather assembly data for the assembler to process. This is unusual, as every assembler that I've worked with supports including binary data directly, without requiring this odd shim.

Regardless, this assembly file also possibly indicates why Kosinski files are always padded to 0x10 bytes: each 'dc.b' directive in the source file is 0x10 values long, so perhaps the tool that produced this assembly file was unable to output a 'dc.b' that was less than 0x10 values long, and so it would instead output dummy 0 values until the 'dc.b' was 'full'.

Closing
Aaaaaaand... that's it. I think that's all I know about Sonic the Hedgehog's source code. Hopefully this information is of use to someone.

Devon · May 24, 2022

I've been digging through the Sonic 2 Nick Arcade and Sonic CD Gems collection symbols for a bit, among other things, and gathered a little collection of what certain labels were called in the source code:

Sonic 1 debug font = ascii

PlaySound = bgmset

PlaySound_Special = soundset

ClearScreen = scrinit

QueueDMATransfer = dmactrset

EniDec = mapdevr

RandomNumber = random

CalcSine = sinset

CalcAngle = atan

PalLoad1 = colorset

PalLoad2 = colorset2

PalPointers = colortbl

Pal_FadeFromBlack = fadein

Pal_FadeToBlack = fadeout

Pal_FadeFromWhite = flashin

Pal_FadeToWhite = flashout

PalCycle_Load = clchgctr

ChangeRingFrame = syspatchg

LevelSizeLoad = scr_set

DeformBgLayer = scroll

RunDynamicLevelEvents = scrchk

loadZoneBlockMaps = mapinit

LoadTilesAsYouMove = scrollwrt

LoadTilesFromStart = mapwrt

LoadCollisionIndexes = scdset

ConvertCollisionArray = scdcnv

BuildSprites = patset

DrawSprite = spatset

RunObjects = action

Obj_Index = act_tbl

DisplaySprite = actionsub

DeleteObject = frameout

MarkObjGone = frameoutchk

MarkObjGone_P1 = frameoutchkd

AnimateSprite = patchg

SingleObjLoad = actwkchk

SingleObjLoad2 = actwkchk2

TouchResponse = pcol

HurtCharacter = playdamageset

KillCharacter = playdieset

Sonic_ResetOnFloor = jumpcolsub

DebugMode = edit

JmpTbl_DbgObjLists = edittbl

SolidObject = hitchk

ObjectMoveAndFall = speedset

ObjectMove = speedset2

Obj79_SaveData = playsave

Obj79_LoadData = playload

AddPoints = scoreup

HudUpdate = scoreset

Hud_InitRings = ringinit

Hud_Base = scoreinit

AniArt_Load = efectwrt

LevelArtPointers = mapinittbl

ArtLoadCues = divdevtbl

SonicDynPLC = playwrtpat

Sonic 1 ColArray = scdtbl1/scdtbl

Sonic 1 ColArray2 = scdtbl2

Sonic 2 ColArray = scdtbl3

Sonic 2 ColArray2 = scdtbl4

Sonic 1 ColCurveMap = scddirtbl1

Sonic 2 ColCurveMap = scddirtbl2

Kos_Z80 (Sonic 1 PCM driver) = pcm_top (followed by pcm_end at the end)

Sonic 2 Nick Arcade objects (also referenced the leaked debug mode code):

Obj01/Sonic = play00

Obj02/Tails = fox (probably)

Obj03/Pathswapper = colichg

Obj06/EHZ corkscrew = sloop

Obj09/Sonic (special stage) = play01

Obj0B/Rotating CPZ floor = kaiten

Obj0C/Small CPZ platform = prodai

Obj10/Sonic (proto debug object) = play02

Obj12/HPZ emerald = gem

Obj13/HPZ waterfall = wfall

Obj14/HTZ seesaw = sisoo

Obj14/HTZ seesaw ball = sball

Obj18/Platform = shima

Obj1F/GHZ Crabmeat = kani

Obj21/HUD = score

Obj22/GHZ Buzz Bomber = hachi

Obj25/Ring = ring

Obj26/Monitor = item

Obj2B/GHZ Chopper = fish

Obj36/Spikes = toge

Obj38/Shield = baria

Obj38/Invincibility stars = muteki

Obj3B/GHZ purple rock = jyama

Obj3D/GHZ boss = boss1

Obj3E/Animal prison = masin

Obj41/Sonic 1 spring = sjump

Obj41/Sonic 2 spring = bane

Obj42/GHZ Newtron = kamere

Obj44/GHZ wall = kageb

Obj48/GHZ boss ball = btama

Obj49/EHZ waterfall = taki

Obj4A/Octopus = oct

Obj4B/Buzzer = wasp

Obj4C/Batbot = bbat/ba

Obj4D/Rhinobot = stego

Obj4E/Alligator bot = gator

Obj4F/Dinobot = redz

Obj50/Seahorse = seahorse

Obj51/Skyhorse = skyhorse

Obj52/Pirahna = bfish/bfish2/fish2

Obj54/Snail = snail

Obj55/Boss parent = bossba

Obj55/EHZ boss subtype = drillerguy

Obj56/Boss explosion = billbomb

Obj57/EHZ boss object 1 = bossdriller

Obj58/EHZ boss object 2 = driller

Obj79/Checkpoint = save

Obj8A/Sonic 1 credits = staff

Variables:

MainCharacter = playerwk

Camera_X_pos = scra_h_posit

Camera_Y_pos = scra_v_posit

Camera_BG_X_pos = scrb_h_posit

Camera_BG_Y_pos = scrb_v_posit

Camera_Min_Y_pos = scralim_up

Camera_Max_Y_pos = scralim_n_down

Camera_Min_Y_pos_Debug_Copy = editstack

Camera_Max_Y_pos_Debug_Copy = editstack2

Game_Mode = gmmode

Ctrl_1_Held = swdata1

Ctrl_1_Press = swdata1+1

Current_ZoneAndAct = stageno

Current_Zone = stageno

Current_Act = stageno+1

Debug_object = editno

Debug_Accel_Timer = edittimer

Debug_Speed = edittimer+1

v_ssrotate (Sonic 1) = rotspd

v_ssangle (Sonic 1) = rotdir

Object variables/SSTs:

id = actno

render_flags = actflg

art_tile = sproffset

mappings = patbase

x_pos = xposi

y_pos = yposi

x_vel = xspeed

y_vel = yspeed

mapping_frame = patno

anim = mstno

status = cddat

subtype = userflag

Other information:

Some of these other symbols were found in other data that hasn't been really properly documented out there yet. There's a whole section other symbols and even older code (I found an earlier version of the Emerald Hill boss and documented it here).

Mappings and DPLCs were definitely done in assembly, possibly by hand. Sprite mappings are generally labelled as "XXXXXpat", with labels for each sprite frame generally being labelled as "XXXXXspNN".

Tile data is labelled as "XXXXXcg".

Sonic 1 special stage maps are labelled as 'rotmaptblN"

Zones are referred to by their ID, not their name.

PLC lists are just labelled as "ddevNN".

There's a function that would load the Sonic 1 collision data if it was in Green Hill Zone, but it relies on how their development hardware worked, hence why it doesn't work in the build we have.

An object's main routine index table is labelled as "XXXXX_move_tbl".

An object's initialization routine is labelled as "XXXXXinit".

An object's main update routine is labelled as "XXXXXmove".

A common local label used when a free object slot was not found is ".worknai".

There's actually a reference to a totally scrapped boss that appeared to initially been made for Chemical Plant. Said symbols are "vacumeguy" and "bossvac".

Due to the nature of them using linking and XREFs, there's actually a couple of reused labels that are, of course, not exported.

Sonic CD developers called the functions that refer to the animals being deleted with a bad future set and the badniks being destroyed with a good future set as "friend_suicide" and "enemy_suicide" respectively. I know that English wasn't their native tongue, but I found it amusing.

Amy was called "emie" in Sonic CD's source code.

The "I'm outta here" in Sonic CD routine is just called "bye".

Of course, this isn't every symbol that's been leaked out, and I'm lacking on Sonic CD's for now, but it's a good chunk I have documented. This should be helpful on documenting the rest later on. A while ago, I did do a quick test of setting up every label in TouchResponse/pcol here. RAM and object variables aren't set up, though, just the code labels.

Devon · May 25, 2022

Just wanted to add that running a Sonic CD ELF file through objdump with the "-l" option while disassembling adds in the filenames and line numbers. The information is there.

Example:

Code:

813080c0 <action>:
action():
813080c0:       94 21 ff f0     stwu    r1,-16(r1)
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:40
813080c4:       7c 08 02 a6     mflr    r0
813080c8:       90 01 00 14     stw     r0,20(r1)
813080cc:       93 e1 00 0c     stw     r31,12(r1)
813080d0:       93 c1 00 08     stw     r30,8(r1)
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:44
813080d4:       3c 60 81 36     lis     r3,-32458
813080d8:       3b e3 c2 c4     addi    r31,r3,-15676
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:45
813080dc:       3b c0 00 00     li      r30,0
813080e0:       48 00 00 40     b       81308120 <action+0x60>
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:46
813080e4:       88 1f 00 00     lbz     r0,0(r31)
813080e8:       28 00 00 00     cmplwi  r0,0
813080ec:       41 82 00 2c     beq     81308118 <action+0x58>
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:53
813080f0:       7f e3 fb 78     mr      r3,r31
813080f4:       88 9f 00 00     lbz     r4,0(r31)
813080f8:       38 04 ff ff     addi    r0,r4,-1
813080fc:       54 05 10 3a     rlwinm  r5,r0,2,0,29
81308100:       3c 80 81 35     lis     r4,-32459
81308104:       38 04 42 70     addi    r0,r4,17008
81308108:       7c 80 2a 14     add     r4,r0,r5
8130810c:       81 84 00 00     lwz     r12,0(r4)
81308110:       7d 89 03 a6     mtctr   r12
81308114:       4e 80 04 21     bctrl
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:56
81308118:       3b de 00 01     addi    r30,r30,1
8130811c:       3b ff 00 44     addi    r31,r31,68
81308120:       2c 1e 00 80     cmpwi   r30,128
81308124:       41 80 ff c0     blt     813080e4 <action+0x24>
C:\project\GEMS\application\SonicCD\src\gc\main\ACTION.C:57
81308128:       83 e1 00 0c     lwz     r31,12(r1)
8130812c:       83 c1 00 08     lwz     r30,8(r1)
81308130:       80 01 00 14     lwz     r0,20(r1)
81308134:       7c 08 03 a6     mtlr    r0
81308138:       38 21 00 10     addi    r1,r1,16
8130813c:       4e 80 00 20     blr

Also, structure variables names are included in the .debug section, including the ones for objects, but I'm not quite sure how to get them extracted.
[IMG]

Devon · Jun 12, 2022

I know, double post and all, but if anyone would like to take a look at R11A's ELF file, extracted ".debug" section, and info generated from objdump, I have them here. The debug section appears to be nonstandard, and I'm not sure how I could go about figuring it out at all.

EDIT: lol figured it out

Devon · Jun 5, 2022

Took another dive into R11A.ELF and organized the symbols by section and filename:

Code:

main\ACTION.C
    .text
        action
        speedset_0
        speedset2
        actionsub
        frameout
        patset
        spatset

main\ACTSET.C
    .text
        flagwkclr
        actsetchk
        actsetinit
        actset
        tm_setchk
        actnoset
        actwkchk
        actwkchk2
        frameout_s
        frameout_s00
        frameout_s0

    .bss
        pAsetadr_dummy
        pAsetadr_w
        pAsetadrz_w

main\DAI_K.C
    .text
        dai_k
        dai_k_init
        dai_k_move
        k_move
        jumpchk_d

    .data
        k_daipat0
        k_daipat1
        k_daipat2
        k_daipat
        k_daichg0
        k_daichg
        dai_k_move_tbl
        pattbl_20

main\DAI_RD1.C
    .text
        dodai
        dodai_init
        dodai_move
        dodai_ud
        dodai_lr
        dodai_ride1
        dodai_ride2
        dodai_nA
        dodai_nB
        dodai_fix
        dodai_fal
        dodai_up
        dodai_upx
        dodai_rm
        dodai_lm
        dodai_sub
        dai_fout
        vfuta
        vfuta_init
        vfuta_move1
        vfuta_move2

    .data
        dai11a_pat1
        dai11a_pat2
        dai11a_pat3
        dai11a_pattbl
        dodai_acttbl
        dai_hstbl_13
        dai_mcnttbl_14
        dodai_mtype
        vfuta_pat0
        vfuta_pat1
        vfutapat
        vfuta_tbl
      
main\DIRCOL.C
    .text
        dircolm
        dircol
        dircol2
        dircol_d
        dircol_d3
        dircol_r
        dircol_r2
        dircol_r3
        dircol_l
        dircol_l2
        dircol_l3
        dircol_u
        dircol_u2
        dircol_u3
        emycol_u
        emycol_d
        emycol_d2
        emycol_d3
        dircolchk
        dircolchk1

main\DUMMY.C
    .text
        pa_set
        fadeout_s

main\EDIT.C
    .text
        edit

    .bss
        CKeyTogle

main\EMIE1.C
    .text
        emie1
        emie1_init
        emie1_matu
        emie1_dakii
        emie1_tobii
        emie1_tobim
        emie_play
        setdirect
        speedset
        speedsetx
        speedsety
        jumpchk_d_0
        pljumpset
        dakicheck
        empatchg
        emie1clrset
        emie1clrsetx
        heartset
        heart1
        heart1_init
        heart1_move

    .data
        em1_tbl
        emie1_clr
        ht1_tbl

main\EMIE1CG.C
    .data
        pat0
        pat1
        pat2
        pat3
        pat4
        pat5
        pat6
        pat7
        pat8
        pat9
        patA
        patB
        patC
        patD
        patE
        patF
        pat10
        emie1pat
        moji_pchg
        run_pchg
        kiss_pchg
        stnd2_pchg
        moji2_pchg
        kyoro_pchg
        em_pchg

main\ENEMY.C
    .text
        ene_ari
        ari_init
        ari_fall
        ari_move
        ene_chou
        chou_init
        chou_move
        ene_ka
        ka_init
        ka_move
        ka_turn
        ka_down
        ka_stop
        ene_kamemusi
        kamemusi_init
        kamemusi_fall
        kamemusi_move
        area
        kamemusi_stop
        kamemusi_stop1
        kamemusi_tama
        kamemusi_tama_init
        tama
        tama_init
        tama_move
        ene_tagame_a
        tagame_init
        tagame_wait
        tagame_wait1
        tagame_jump
        tagame_jump1
        ene_tama

    .data
        ari_pchg00
        ari_pchg01
        ari_pchg
        ari0
        ari1
        ari2
        ari3
        ari_pat
        chou_pchg00
        chou_pchg01
        chou_pchg
        chou1e
        chou2e
        chou3e
        chou1b
        chou2b
        chou3b
        e_chou_pat
        b_chou_pat
        pchg_e_0
        pchg_e_1
        pchg_e
        pchg_b_0
        pchg_b_1
        pchg_b
        ka1e
        ka2e
        ka3e
        ka4e
        ka5e
        ka1b
        ka2b
        ka3b
        ka4b
        ka5b
        b_ka_pat
        e_kamem_pchg00
        e_kamem_pchg01
        e_kamem_pchg
        b_kamem_pchg00
        b_kamem_pchg01
        b_kamem_pchg
        kamem_pat00e
        kamem_pat00b
        kamem_pat01
        kamem_pat02
        e_kamem_pat
        b_kamem_pat
        tama_pchg00
        tama_pchg
        tama_pat00
        tama_pat01
        tama_pat02
        tama_pat03
        tama_pat
        e_tagame_pchg00
        e_tagame_pchg01
        e_tagame_pchg
        b_tagame_pchg00
        b_tagame_pchg01
        b_tagame_pchg
        tagame_pat00
        tagame_pat01
        tagame_pat02
        tagame_pat03e
        tagame_pat04e
        tagame_pat05e
        tagame_pat03b
        tagame_pat04b
        tagame_pat05b
        tagame_pat06
        e_tagame_pat
        b_tagame_pat

main\EQU.C
    .bss
        ta_flag
        clrspflg_save
        flagworkcnt
        flagworkcnt2
        pl_suu
        main_play
        pl_air
        pltimeover_f
        plring_f2
        pl_suu_f
        plring_f
        pltime_f
        plscore_f
        plring
        plscore
        play_start
        start_flag
        plpower_b
        plpower_m
        plpower_s
        plpower_a
        plflag
        plflag_s
        plxposi_s
        plyposi_s
        plring_s
        pltime_s
        time_flag
        scralim_down_s
        scra_h_posit_s
        scra_v_posit_s
        scrb_h_posit_s
        scrb_v_posit_s
        scrc_h_posit_s
        scrc_v_posit_s
        scrz_h_posit_s
        scrz_v_posit_s
        waterposi_m_s
        water_flag_s
        waterflag_s
        plring_f2_s
        generate_flag
        plsubchg_flag
        enkeino
        projector_flag
        special_flag
        conbine_flag
        enecgflg
        emie3end
        extrascore
        markerno
        gf_flag
        chibi_s
        tv_flag
        edittimer
        time_stop
        sys_pattim
        sys_patno
        sys_pattim2
        sys_patno2
        sys_pattim3
        sys_patno3
        sys_pattim4
        sys_patno4
        sys_ringtimer
        editstack
        editstack2
        mapcheck
        blkno
        edit_user
        sysdirec
        prio_flag
        init_flag
        boss_sound
        shut_flag
        st6clrchg
        chibi_flag
        mapwrt_cnt
        startcolor
        colorcnt
        int_flg
        linkdata
        cltbladr
        ranum
        cgwrtcnt
        cgwrttim
        dmastack
        waterposi
        waterposi_m
        watermoveposi
        waterspeed
        water_flag
        waterflag
        waterflag2
        scralim_n_left
        scralim_n_right
        scralim_n_up
        scralim_n_down
        scralim_left
        scralim_right
        scralim_up
        scralim_down
        scrar_no
        scra_h_keep
        scra_v_keep
        scra_hz
        scra_vz
        scra_vline
        scrh_flag
        scrv_flag
        scra_h_count
        scra_v_count
        scrb_h_count
        scrb_v_count
        scrc_h_count
        scrc_v_count
        scrz_h_count
        scrz_v_count
        limmoveflag
        playpatno1
        kusya_flag
        plmaxspdwk
        pladdspdwk
        plretspdwk
        playpatno
        playwrtflag
        asetposi
        time_item
        backto_cnt
        scr_cnt
        demo_adr
        demo_cnt
        swbufcnt
        scra_hline
        bossflag
        bossstart
        loopmapno
        loopmapno2
        ballmapno
        ballmapno2
        watercoliflag
        waterstop
        mizuflag
        sekichyuflag
        plautoflag
        specflag
        dai2rmvflag
        emyscorecnt
        timebonus
        ringbonus
        bonus_f
        edplayflag
        ms_wflg
        lpKeepWork
        lpFadeFlag
        lpcolorwk4
        lpcolorwk3
        lpcolorwk2
        lpcolorwk
        switchflag
        waterdirec
        clchgtim
        clchgcnt
        plposiwkadr
        scdadr
        byecnt1
        byecnt0
        asetadrz2
        asetadrz
        asetadr2
        asetadr
        actset_rno
        dirstk
        scrflagz
        scrflagc
        scrflagb
        scrflaga
        scr_timer
        scr_die
        scroll_start
        zone_flag
        scrz_v_posit
        scrz_h_posit
        scrc_v_posit
        scrc_h_posit
        scrb_v_posit
        scrb_h_posit
        scra_v_posit
        scra_h_posit
        divdevwk
        cgchgtim
        cgchgcnt
        pauseflag
        intcnt
        hscroll
        vscroll
        swdata2
        swdata1
        swdata
        gmmode
        actwk
        lphscrollbuff
        playposiwk
        pbuffer
        hscrollwork
        flowwk
        blockwk
        pmapwk
        linework
        col_x
        col_y
        scrflagzw
        scrflagcw
        scrflagbw
        scrflagaw
        scrz_v_posiw
        scrz_h_posiw
        scrc_v_posiw
        scrc_h_posiw
        scrb_v_posiw
        scrb_h_posiw
        scra_v_posiw
        scra_h_posiw
        systemtimer
        editmode
        editno
        flowercnt
        flowerposi
        debugflag
        demoflag
        debugwork
        pltime
        stageno
        gametimer
        gameflag
        flagwork

main\ET1.C
    .text
        et
        m_init
        m_wait
        m_die
        m1wait
        a_hover

    .data
        tpat00
        tpat01
        tpat07
        tpat02
        tpat03
        tpat04
        tpat05
        tpat06
        pat_et
        tbl0sproffset
        tbl0
        pchg0
        pchg

main\ETC.C
    .text
        sinset
        atan_sonic

main\FCOL.C
    .text
        fcol
        fcol_d
        fcol_r
        fcol_u
        fcol_l
        scdend
        scdchk
        scdchk2
        scdend_r
        scdchk_r
        scdchk2_r
        scramapad
        dirchk
        scdcnv
        st_elseDataChk
        st_wackyDataChk
        st_starDataChk
        st_metalDataChk
        CCset
        CSset

main\GAME.C
    .text
        DLL_meminit
        DLL_memfree
        Print_Msg
        Get_vscroll
        Get_scra_h_posiw
        Get_scrb_h_posiw
        SetDebugFlag
        game
        game_init
        play_act_set
        scdset
        syspatchg
        back_to_cnt
        bye_cnt
        sdfdout
        sdfdin
        da_set
        main

    .data
        da_tbl_189

    .bss
        Interupt_Counter
        PauseIcon
        SetGrid
        EAsprset
        ClrSpriteDebug
        WaveRequest
        CDPlay
        CDPause
        ChangeTileBmp
        WaveAllStop
        sMemSet
        sMemCpy
        sRandom
        sPrintf
        sOutputDebugString
        sOpenFile
        sReadFile
        sCloseFile
        lpghWnd
        sGetFileSize

main\GOAL.C
    .text
        gene
        gene_init
        gene_move0
        gene_move1
        kira_set
        kira_move
        gene_coli
        bring2
        bring2init
        bring2move0
        bring2move1
        bigring
        bring_init
        bring_move0
        bring_move1
        bring_coli
        mosugu
        mosug_init
        mosug_move0
        mosug_move1
        offset_set
        goal
        goal_init
        goal_move0
        goal_move1
        goal_move2
        goal_move3

    .data
        gene_tbl
        bring2_tbl
        bigring_tbl
        mosugu_tbl
        goal_tbl

main\IO.C
    .text
        SWdataSet
        scrinit

main\ITEM.C
    .text
        timedisp
        td_init
        td_move
        t_item
        t_item_init
        t_item_move0
        t_item_move1
        t_item_move2
        flagwkadr
        ride_on_chk_i
        item
        iteminit
        itemmove
        itemmove2
        itemmove3
        itemget
        powerup_init
        item2
        item2init
        item2move
        item2die
        error_item

    .data
        itemchg0
        itemchg1
        itemchg2
        itemchg3
        itemchg4
        itemchg5
        itemchg6
        itemchg7
        itemchg8
        itemchg9
        itemchg
        ite00
        ite01
        ite02
        ite03
        ite04
        ite05
        ite06
        ite07
        ite08
        ite09
        ite0a
        ite0b
        ite0c
        ite0d
        ite0e
        ite0f
        ite10
        ite11
        ite12
        ite13
        itempat
        cor00
        cor01
        cor02
        cor03
        cor04
        cor05
        cor06
        cor07
        cor08
        cor09
        cor0a
        cor0b
        cor0c
        cor0d
        cor0e
        cor0f
        corepat

main\PLAYER.C
    .text
        bye_chk
        play00
        muteki_set
        play00init
        mizuki_set
        mapno_chk
        scr_h
        play00move
        playpowercnt
        playposiwkset
        plwaterchk
        playsave
        backto_chk
        play00walk
        play00jump
        ball00walk
        ball00jump
        chk11
        levermove
        lmovecol
        plwalk_l
        plwalk_r
        balllmove
        ballwalk_l
        ballwalk_r
        jumpmove
        limitchk
        ballchk
        ballset
        jumpchk
        jumpchk2
        keispd
        keispd2
        fallchk
        direcchg
        jumpcolchk
        jumpcolsub
        jumpcolsub0
        play00damage
        play00damage_sub
        play00die
        play00die_sub
        play00erase
        loopchk
        st7_x
        patchgmain
        patchgmain2
        playrunchg
        playrunchg2
        playrunchg3
        platetc_chg
        little_runchg
        little_patchg
        frip_spd

    .bss
        WaveClear
        Brake_Req
        Brake_Sw

main\PLAYPAT1.C
    .data
        pat00
        pat01
        pat02
        pat03
        pat04
        pat05
        pat06
        pat07
        pat08
        pat09
        pat0a
        pat0b
        pat0c
        pat0d
        pat0e
        pat0f
        pat10
        pat11
        pat12
        pat13
        pat14
        pat15
        pat16
        pat17
        pat18
        pat19
        pat1a
        pat1b
        pat1c
        pat1d
        pat1e
        pat1f
        pat20
        pat21
        pat22
        pat23
        pat24
        pat25
        pat26
        pat27
        pat28
        pat29
        pat2a
        pat2b
        pat2c
        pat2d
        pat2e
        pat2f
        pat30
        pat31
        pat32
        pat33
        pat34
        pat35
        pat36
        pat37
        pat38
        pat39
        pat3a
        pat3b
        pat3c
        pat3d
        pat3e
        pat3f
        pat40
        pat41
        pat42
        pat43
        pat44
        pat45
        pat46
        pat47
        pat48
        pat49
        pat4a
        pat4b
        pat4c
        pat4d
        pat4e
        pat4f
        pat50
        pat51
        pat52
        pat53
        pat54
        pat55
        pat56
        pat57
        pat58
        pat59
        pat5a
        pat5b
        pat5c
        pat5d
        pat5e
        pat5f
        pat60
        pat61
        pat62
        pat63
        pat64
        pat65
        pat66
        pat67
        pat68
        pat69
        pat6a
        pat6b
        pat6c
        pat6d
        pat6e
        pat6f
        pat70
        pat71
        pat72
        pat73
        pat74
        pat75
        pat76
        pat77
        pat78
        pat79
        pat7a
        pat7b
        pat7c
        pat7d
        pat7e
        pat7f
        pat80
        pat81
        pat82
        pat83
        pat84
        pat85
        pat86
        pat87
        pat88
        pat89
        pat8a
        pat8b
        pat8c
        pat8d
        pat8e
        pat8f
        pat90
        pat91
        pat92
        pat93
        pat94
        pat95
        pat96
        pat97
        pat98
        pat99
        pat9a
        pat9b
        pat9c
        pat9d
        pat9e
        pat9f
        pata0
        pata1
        pata2
        pata3
        pata4
        pata5
        pata6
        pata7
        pata8
        pata9
        pataa
        patab
        patac
        patad
        patae
        pataf
        patb0
        patb1
        patb2
        patb3
        patb4
        patb5
        patb6
        patb7
        patb8
        patb9
        patba
        patbb
        patbc
        patbd
        patbe
        patbf
        patc0
        patc1
        patc2
        patc3
        patc4
        patc5
        sncpat

main\PLAYSP.C
    .text
        playsp

main\PLAYSUB.C
    .text
        patchg
        playsave0
        marker
        marker_init
        marker_move0
        marker_move1
        marker_move2
        plairset
        tensuu_set
        tensuu0
        bakuha
        baku_init
        baku_move
        baku_die
        flower
        flow_init
        flow_move0
        flow_move1
        flow_sub
        flow_sub1
        flow_move2
        flow_move3
        mizukiri
        mizuki_init
        mizuki_move
        mizuki_move2
        futa
        ride_on_chk_f
        futa_init
        futa_move
        futa_move2
        futa_move3
        exit2_set
        col_chk
        exit2
        exit2_init
        exit2_move
        exit2_erase
        baria
        bariainit
        bariamove
        mutekimove
        backtomove
        muteki_sub
        actionsub0
        ball
        ball_init
        ball_move
        ball_ball
        ball_rd7
        ball_coli

    .data
        flowchg0
        flowchg1
        flowchg2
        flowchg3
        flowchg
        flo00
        flo01
        flo02
        flo03
        flo04
        flo05
        flo06
        flo07
        flow_pat

main\PLCHG.C
    .data
        plchg00
        plchg01
        plchg02
        plchg03
        plchg04
        plchg05
        plchg06
        plchg07
        plchg08
        plchg09
        plchg10
        plchg11
        plchg12
        plchg13
        plchg14
        plchg15
        plchg16
        plchg17
        plchg18
        plchg19
        plchg20
        plchg21
        plchg22
        plchg23
        plchg24
        plchg25
        plchg26
        plchg27
        plchg28
        plchg29
        plchg30
        plchg31
        plchg32
        plchg33
        plchg34
        plchg35
        plchg36
        plchg37
        plchg38
        plchg39
        plchg40
        plchg41
        plchg42
        plchg43
        plchg44
        plchg45
        plchg46
        plchg47
        plchg48
        plchg49
        plchg50
        plchg51
        plchg52
        plchg53
        plchg54
        plchg55
        plchg56
        plchg57
        playchg

main\RIDECHK.C
    .text
        ride_on_clr
        ride_on_set
        hitchk_u
        ridechk
        ride_on_chk
        hitchk
        hit_v
        hit_x
        push_set
        push_clr
        hit_y
        hit_yu
        hit_yu1
        hit_yu0
        hit_e
        side_coli
        hit_set
        hit_clr

main\RING.C
    .text
        ring
        ringinit_0
        ringmove
        ringget
        ringgetsub
        ringdie
        ringerase
        flyring
        flyringinit
        flyringmove
        flyringget
        flyringdie
        flyringerase

    .data
        ringsp0
        ringsp1
        ringsp2
        ringsp3
        ringsp4
        ringsp5
        ringsp6
        ringsp7
        ringsp8
        ringpat
        ringchg0
        ringchg1
        ringchg2
        ringchg

main\SCORE.C
    .text
        tensuu
        ten_init
        ten_move
        score
        score_init
        score_move
        scoreup
        scoreset
        ringinit
        scoreinit
        posiwrt
        bonuswrt
        ringwrt
        scorewrt
        scorewrt2
        posiwrt0
        playsuuwrt
        timewrt1
        timewrt
        timewrt0

    .data
        subtbl
        subtblh4
        tenpat0
        tenpat1
        tenpat2
        tenpat3
        tenpat4
        tenpat5
        tenpat
        scorepat0
        scorepat1
        scorepat2
        scorepat3
        scorepat
        scoreinittbl
        ringinittbl

main\SCRCHK.C
    .text
        scrchk
        zone1chk
        zone11chk
        zone12chk
        zone13chk
        zone3chk
        zone31chk
        zone33chk
        zone6chk
        zone5chk
        zone51chk
        zone53chk
        zone8chk
        zone81chk
        zone83chk
        zone4chk
        zone41chk
        zone42chk
        zone4chk
        zone7chk
        zone71chk
        zone72chk
        zone73chk
        bossclr_scr
        bossclr_scrset

main\SPRING.C
    .text
        iwa
        iwa_init
        iwa_move
        koma
        koma_init
        koma_move
        koma_move2
        spring_d
        spr_d_init
        spr_d_move
        spring
        sjumpinit
        ride_on_chk_s
        sjumpmove
        sjumpmove2
        sjumpmove3
        ride_on_chk_s1
        sdushmove
        sdushmove2
        sdushmove3
        ride_on_chk_s2
        sjump2move
        sjump2move2
        sjump2move3
        sjump3move
        sjump3move2
        sjump3move3

    .data
        spat00
        spat01
        spat02
        spat03
        spat04
        spat05
        spat06
        spat07
        spat08
        kpat00
        kpat01
        ipat00
        spat10
        spat11
        spat12
        spat13
        spat14
        spat15
        spat16
        spat17
        spat18
        springpat
        spring90pat
        spring45pat
        springpat2
        spring90pat2
        spring45pat2
        komapat
        iwapat
        springchg0
        springchg
        komachg0
        komachg
        sjump_move_tbl

main\SUICIDE.C
    .text
        enemy_suicide
        friend_suicide

main\TAKI.C
    .text
        taki
        taki_init
        taki_move
        jisin_set
        jisin

    .data
        shibukichg0
        shibukichg
        shibuki0
        shibuki1
        shibukipat
        taki_move_tbl

main\TBL0.C
    .data
        genechg0
        genechg1
        genechg
        genepat0
        genepat1
        genepat2
        genepat3
        genepat4
        genepat5
        genepat6
        genepat7
        genepat8
        genepat
        bringchg0
        bringchg
        bringpat0
        bringpat1
        bringpat2
        bringpat3
        bringpat
        bring2chg0
        bring2chg
        bring2pat0
        bring2pat1
        bring2pat2
        bring2pat3
        bring2pat4
        bring2pat5
        bring2pat6
        bring2pat7
        bring2pat
        goalchg0
        goalchg
        goalsp0
        goalsp1
        goalsp2
        goalsp3
        goalsp4
        goalsp5
        goalpat

main\TBL1.C
    .data
        bariachg0
        bariachg1
        bariachg2
        bariachg3
        bariachg4
        bariachg5
        bariachg6
        bariachg7
        bariachg8
        bariachg
        bar00
        bar01
        bar02
        bar03
        bar04
        bar05
        bar06
        bar07
        bar08
        bar09
        bar0a
        bar0b
        bar0c
        bariapat
        exit2chg0
        exit2chg1
        exit2chg2
        exit2chg
        exi00
        exi01
        exi02
        exi03
        exi04
        exi05
        exi06
        exit2pat
        futachg0
        futachg
        fut00
        fut01
        futapat
        mizukichg0
        mizukichg
        miz00
        miz01
        miz02
        mizukipat
        baku_chg0
        baku_chg1
        bakuchg
        bak00
        bak01
        bak02
        bak03
        bak04
        bak05
        bak06
        bakupat
        mkchg
        markerchg
        pat00_0
        pat01_0
        pat02_0
        pat03_0
        markerpat

main\TREE.C
    .text
        hoshi
        hoshi_init
        hoshi_move
        kasoku0
        k0_init
        k0_move
        kasoku
        kasoku_init
        kasoku_move

    .data
        hoshi_tbl
        k0_tbl
        kasoku_tbl
        hoshipat0
        hoshipat1
        hoshipat
        kasokuchg0
        kasokuchg1
        kasokuchg2
        kasokuchg
        kasokupat_a
        kasokupat_b
        kasokupat_c
        kasokupat_d
        kasokupat_e
        kasokupat_f
        kasokupat_g
        kasokupat_h
        kasokupat_i
        kasokupat_j
        kasokupat

main\ZONE.C
    .text
        over
        over_init
        over_move
        title
        title_init
        title_move0
        title_move1
        title_back0
        title_back1
        title_wait
        clear
        clear_init0
        clear_init
        clear_move0
        clear_move1
        clear_move2
        clear_wait

    .data
        game0
        game1
        gamepat
        time0
        time1
        timepat
        gotpat0
        gotpat1
        gotpat2
        gotpat3
        madepat0
        madepat1
        madepat2
        madepat3
        bonuspat
        bonuspat0
        gotpat
        gotpat_0
        madepat
        madepat_0
        cleartbl

    .bss
        ClearSountWait
        WaitCount

main\ZONETBL1.C
    .data
        titletbl
        titlepat0
        titlepat1
        titlepat2
        titlepat3
        titlepat4
        titlepat5
        titlepat6
        titlepat7
        titlepat8
        title_pat

main\R1\ACT11A.C
    .text
        noact

    .data
        act_tbl

main\R1\COL1A.C
    .text
        clchgctr
        colchg11a
        clchg_sub0
        fadein0
        fadein0_new
        fadein1
        fadein2
        fadeout_new
        fadeout1
        fadeout2
        flashin
        flashin_new
        flashin1
        flashin2
        flashout_new
        flashout1
        flashout2
        colorset
        colorset2
        colorset00
        FadeProc

    .data
        clst1_1a0
        clst1_1a1
        advacolor
        advacolor2
        gamecolor
        zone1colora0
        zone1colora1
        zone1colora
        colortbl
        col1a0cnt
        col1a0col
        col1a1cnt
        col1a1col
        col1a2cnt
        col1a2col
        col1a3cnt
        col1a3col
        col1a4cnt
        col1a4col
        col1a5cnt
        col1a5col

    .bss
        FadeCount

main\R1\DEV11A.C
    .data
        mapinittbl

main\R1\EDTBL11A.C
    .data
        edit_tbl

main\R1\KOWASI1.C
    .text
        kowasi
        m_init_0
        m_wait_0
        m_down

    .data
        spr_kowasi00
        spr_kowasi01
        spr_kowasi02
        spr_kowasi03
        spr_kowasi04
        spr_kowasi05
        spr_kowasi06
        spr_kowasi07
        spr_kowasi08
        spr_kowasi09
        spr_kowasi0a
        spr_kowasi0b
        spr_kowasi0c
        spr_kowasi0d
        pat_kowasi

main\R1\KUZUR11A.C
    .data
        pata00
        patbase_kuzure_a
        tbla00
        tbla
        patc00
        patc01
        patc02
        patc03
        patc04
        patc05
        patc06
        patc
        patb00
        patb01
        patb02
        patb03
        patb04
        patbase_kuzure_b
        tblb00
        tblb01
        tblb02
        tblb03
        tblb04
        tblb
        patd00
        patd01
        patd02
        patd03
        patd04
        patd05
        patd

main\R1\KUZURE.C
    .text
        kuzureru_tikei
        acta_init
        acta_check
        actb_wait
        actb_down
        actb_init_a
        actb_init_b

main\R1\SCR11A.C
    .text
        enecginit
        divdevset
        scr_set
        playposiset
        scrbinit
        scroll
        scroll_h
        scrh_move
        right_check
        left_check
        scroll_v
        sv_move_main
        sv_move_main1
        sv_move_main2
        sv_move_sub2
        sv_move_sub
        sv_move_minus
        scrv_up_ch
        sv_move_plus
        scrv_down_ch
        scrv_move
        scrollb_v
        scrollb_h
        scrollc_h
        scrollz_h
        scrollwrt
        scrollwrtb
        hblockwrt
        hblockwrt1
        vblockwrt
        blockwrt
        mapadrset
        mapadrset1
        mapadrset99
        mapadrset2
        block_wrt
        block_chk
        vramadrset
        vramadrset1
        vramadrset0
        vramadrset99
        scr11a_test
        mapwrt
        mapwrt2
        mapwrt3
        mapwrt_z81a
        mapwrt_sub
        mapinit
        mapset

    .data
        z81awrttbl
        vblockwrtbtbl
        mapwrt_tbl

main\R1\SHOOT1.C
    .text
        kage
        kage_init
        kage_move
        ana
        kage1_init
        kage1_move0
        kage1_move1
        kage1_chk
        kage1_clr
        shooter
        shooterinit
        shootermove
        shootermove2
        shootermove3
        shooterspdset
        mspd_set

    .data
        kag00
        kag01
        kagepat
        ana00
        kage1pat
        shooterposi_0
        shooterposi_1
        shooterposi_2
        shooterpositbl
      
main\R1\SISAKE.C
    .text
        colli_pl_sikake_d
        colli_pl_sikake
        tobita1
        tobita_init
        tobita_stop_r
        tobita_stop_l
        tobita_ride_r
        tobita_ride_l
        tobita_yure_r
        tobita_yure_l
        hariyama
        hari_init
        hari_normal

    .data
        tobita1chg0
        tobita1chg1
        tobita1chg2
        tobitastop1
        tobitastop2
        tobita1chg
        tobita_a
        tobita_b
        tobita_c
        tobita_r_a
        tobita_r_b
        tobita_r_c
        tobita1_pat
        pat0_0
        hari12pat

main\R1\Z11ACT.C
    .data
        dummyarea
        asettbl
        asettblz

main\BLOCK.C
    .text
        block
        block_init
        block_move
        block_move2
        block_move3
        block_move4
        block_move5
        block_move6
        block_ride
        ride_on_chk_b

    .data
        block_tbl
        blockchg0
        blockchg1
        blockchg2
        blockchg
        block0
        block1
        block2
        block3
        block4
        block5
        blockpat

main\LOADER2.C
    .text
        ShortSWAP
        GetRoundStr
        ReadBlockMap
        ReadScrolMap
        soundset

    .data
        SeToWavTbl

main\BMP.C
    .bss
        SprBmp

main\R1\COLI1.C
    .text
        pcol
        CollitblDataXchk
        CollitblDataYchk
        ColliHitChk
        pcolitem
        pcolnomal
        pcolplay2
        pcolplay
        pcole
        playdamagechk
        playdamageset
        playdieset
        pcolspecial
        eggman_chk
        yago
        main_attack

    .data
        escoretbl
        colitbl

    .bss
        bCarry

main\R1\Z11ATBL.C
    .data
        scddirtbl
        scdtblwk
        scdtblwk2
        zone1scd
        mapwka
        mapwkb

main\SAVE.C
    .text
        playloadb
        playload

main\R1\FRIEND1.C
    .text
        t_roll
        rev_h
        set_sproffset
        friend
        t_init
        t_move
        t_movie
        p_init
        p_move
        p_movie

    .data
        pchg00
        pchg01
        pchg10
        pchg0_0
        pchg1
        spr_flicky1
        spr_flicky2
        spr_ricky1
        spr_ricky2
        spr_ricky3
        spr_ricky4
        spr_friend0
        spr_ricky5
        pat_friend0
        pat_friend1
        tbl0sproffset
      
main\R1\MOVIE1.C
    .text
        move1
        die
        mm_init
        mm_wait
        mm_die
        m_baku
        mm1wait
        sub
        s_init
        s_move

    .data
        movie1_pchg00
        movie1_pchg01
        movie1_pchg
        spr_movie1
        spr_movie2
        spr_movie3
        spr_movie4
        spr_movie5
        spr_movie0
        pat_movie
        tbl0_0

Code:

main\ACTION.C
    RunObjects
    ObjectMoveAndFall
    ObjectMove
    DisplaySprite
    DeleteObject
    BuildSprites
 
main\ACTSET.C
    ObjectsManager
    SingleObjLoad
    SingleObjLoad2
    MarkObjGone
 
main\DAI_K.C
    Spinning Platform
 
main\DAI_RD1.C
    Platform
    Vertical flapping door
 
main\DIRCOL.C
    CalcRoomInFront
    CalcRoomOverHead
    CheckFloorDist
    ObjCheckFloorDist
    CheckRightWallDist
    ObjCheckRightWallDist
    CheckCeilingDist
    ObjCheckCeilingDist
    CheckLeftWallDist
    ObjCheckLeftWallDist
 
main\DUMMY.C
    Routine to set object's tile ID
    Routine to fade out music
 
main\EDIT.C
    DebugMode
 
main\EMIE1.C
    Amy
 
main\EMIE1CG.C
    Amy mappings and animations
 
main\ENEMY.C
    Anton
    Pata-Bata
    Mosqui
    Kamemusi
    Tamabboh(?)
    Taga-Taga
 
main\EQU.C
    Level variables
 
main\ET1.C
    Robot generator
 
main\ETC.C
    CalcSine
    CalcAngle
 
main\FCOL.C
    AnglePos
    Find_Tile
    FindFloor
    FindWall
    ConvertCollisionArray
 
main\GAME.C
    Main level routine
    Routine to spawn player
    LoadCollisionIndexes
    ChangeRingFrame
    Routine to update time warp timer
    Routine to update bored timer
    Routine to pause music
    Routine to unpause music
    Routine to play level music
 
main\GOAL.C
    Flower capsule
    Big ring
    Goal post
    Signpost
 
main\IO.C
    ReadJoypads
    ClearScreen
 
main\ITEM.C
    Monitor/Time post
 
main\PLAYER.C
    Sonic
 
main\PLAYPAT1.C
    Sonic mappings
 
main\PLAYSP.C
    Routine for handling special level collision
 
main\PLAYSUB.C
    AnimateSprite
    Checkpoint
    ResumeMusic
    Test badnik
    Explosion
    Flower
    Spin tunnel waterfall splash
    Spin tunnel door
    Spin tunnel door splash
    Powerup (shield, invincibility stars, time warp stars)
    Spin tunnel tag
 
main\PLCHG.C
    Sonic animations
 
main\RIDECHK.C
    SolidObject
 
main\RING.C
    Ring
    Lost rings from getting hurt
 
main\SCORE.C
    HUD object
    AddPoints
    HudUpdate
    Hud_InitRings
    HudBase
 
main\SCRCHK.C
    RunDynamicLevelEvents
 
main\SPRING.C
    Moving spring with wheel object
    Spring object
 
main\SUICIDE.C
    Time zone checks for animals and badniks
 
main\TAKI.C
    Scrapped waterfall effect
    Scrapped earthquake effect
 
main\TBL0.C
    Flower capsule animations and mappings
    Big ring animations and mappings
    Signpost animations and mappings
 
main\TBL1.C
    Powerup animations and mappings
    Spin tunnel door splash animations and mappings
    Spin tunnel door animations and mappings
    Spin tunnel waterfall splash animations and mappings
    Explosion animations and mappings
    Checkpoint animations and mappings
 
main\TREE.C
    3D star plant
    3D loop/ramp booster
 
main\ZONE.C
    Game over
    Title card
    End results card
 
main\ZONETBL1.C
    Title card mappings
 
main\R1\ACT11A.C
    Null object
    ObjectIndex
 
main\R1\COL1A.C
    PalCycle_Load
    Pal_FadeFromBlack
    Pal_FadeToBlack
    Pal_FadeFromWhite
    Pal_FadeToWhite
    PalLoad_ForFade
    PalLoad_Now
 
main\R1\DEV11A.C
    LevelArtPointers
    ArtLoadCues(?)
 
main\R1\EDTBL11A.C
    JmpTbl_DbgObjLists
 
main\R1\KOWASI1.C
    Breakable wall
 
main\R1\KUZUR11A.C
    Collapsing platform mappings
 
main\R1\KUZURE.C
    Collapsing platform
 
main\R1\SCR11A.C
    Routine to initialize object graphics
    LoadPLC
    LevelSizeLoad
    InitCameraValues
    DeformBgLayer
    ScrollHoriz
    ScrollVerti
    Bg_Scroll_Y
    BGScroll_Block1
    BGScroll_Block2
    BGScroll_Block3
    LoadTilesAsYouMove
    DrawBlocks_LR
    DrawBlocks_TB
    DrawBlock
    GetBlock
    Routine to place a block at a position
    Routine to check if a block is on screen
    CalcBlockVRAMPos
    DrawInitialBG
    loadZoneBlockMaps
    loadLevelLayout
 
main\R1\SHOOT1.C
    Hollow log background
    Sonic shaped hole
    Hidden spin tunnel
 
main\R1\SISAKE.C
    Springboard
    Spikes
 
main\R1\Z11ACT.C
    Object layout data
 
main\BLOCK.C
    Small platform
 
main\LOADER2.C
    Gems Collection specific loading routines
    PlaySound
 
main\R1\COLI1.C
    TouchResponse
 
main\R1\Z11ATBL.C
    ColCurveMap
    ColArray
    ColArray2
    Level collision data
    Level layout data
 
main\SAVE.C
    Routine for loading data saved at checkpoint
    Routine for loading data saved in time travel
 
main\R1\FRIEND1.C
    Animal
 
main\R1\MOVIE1.C
    Metal Sonic projector

Devon · May 15, 2023

I would like to add something regarding ROM sections.

I've been taking a look at Sonic Jam, and I realized that each game has been split up into different files. In Sonic 1's case, there's "AC.SN1", "ACTTBL.SN1" (also ACTTBL_E.SN1" and "ACTTBL_N.SN1", because Jam has different difficulty settings), "DATA.SN1", and "TBL.SN1". "AC" is the game code, "DATA" holds compressed graphics, tilemaps, and stage blocks/chunks. "TBL" holds collision data, uncompressed graphics, and stage layouts (including special stages), and "ACTTBL" holds object layouts.

I then took a look at the disassembly, and I noticed that the padding between sections corresponds to how the game was split up in Jam.

"DATA" starts off with the Sega Logo graphics, and in the original ROM, you can see the padding placed before said graphics.
Code:
       rept $300
           dc.b   $FF
       endm
Nem_SegaLogo:   binclude   "artnem/Sega Logo (JP1).bin" ; large Sega logo
           even
The last piece of data in the "DATA" file is the graphics for the logo in the ending, and look at that, another piece of padding right after it in the original ROM:
Code:
Nem_EndStH:   binclude   "artnem/Ending - StH Logo.bin"
       even

       if Revision=0
       rept $104
       dc.b $FF           ; why?
       endm
       else
       rept $40
       dc.b $FF
       endm
       endif
After this bit of padding is the stage collision data, which so happens to be the "TBL" section
Code:
       if Revision=0
       rept $104
       dc.b $FF           ; why?
       endm
       else
       rept $40
       dc.b $FF
       endm
       endif
; ---------------------------------------------------------------------------
; Collision data
; ---------------------------------------------------------------------------
AngleMap:   binclude   "collide/Angle Map.bin"
       even
CollArray1:   binclude   "collide/Collision Array (Normal).bin"
       even
       ...
The last bit of data in the "TBL" file is the graphics for the special stage ring, and in the original ROM, you can see another bit of padding placed after it:
Code:
Art_BigRing:   binclude   "artunc/Giant Ring.bin"
       even

       align   $100
And after that are the stage object layouts, aka "ACTTBL":
Code:
       align   $100

; ---------------------------------------------------------------------------
; Sprite locations index
; ---------------------------------------------------------------------------
ObjPos_Index:
       ; GHZ
       dc.w ObjPos_GHZ1-ObjPos_Index, ObjPos_Null-ObjPos_Index
       dc.w ObjPos_GHZ2-ObjPos_Index, ObjPos_Null-ObjPos_Index
       dc.w ObjPos_GHZ3-ObjPos_Index, ObjPos_Null-ObjPos_Index
       dc.w ObjPos_GHZ1-ObjPos_Index, ObjPos_Null-ObjPos_Index
The "ACTTBL" file ends with the last object layout, and, of course, in the original ROM, after that is some more padding:
Code:
ObjPos_Null:   dc.b $FF, $FF, 0, 0, 0,   0

       if Revision=0
       rept $62A
       dc.b $FF
       endm
       else
       rept $63C
       dc.b $FF
       endm
       endif
Which is then followed by the sound driver after.

So, based on this info, you can see that the original game had multiple ROM sections: the code ("AC"), compressed graphics, tilemaps, and stage blocks and chunks ("DATA"), stage collision, layouts (both regular and special stages), and uncompressed graphics ("TBL"), stage object layouts ("ACTTBL"), and then finally the sound driver and data. This is why such "useless" padding exists. Each section was aligned.

Sonic 2 works similarly, but it also adds the "RINGACT" (ring layouts) and "TBL2" (additional compressed graphics, placed between the sound driver + drum samples and music + SFX data) sections.

Devon · Sep 14, 2023

So, I was taking a look at the Sonic 2 patent, and I saw this (fyi, yes I know this isn't anything new, but there's just some things I feel like pointing out for the sake of this thread)

The patent has some pretty interesting things to note. Objects are indeed called sprites, with its structure of variables in RAM being a "sprite status table", which definitely shows where we got that name from. Stuff related to graphics and animation line up with the official variables names as well. The patent also goes into detail about how the corkscrew, pathswapping mechanism, and 2 player mode work, including detail on how the teleportation/swap monitor works.

From what I can tell, 16x16 blocks are referred to as "graphics (path) blocks", which its associated collision IDs referring to "collision blocks". Chunks don't seem to be referenced, since with collision and path swapping, that all happens on the block level, not the chunk level, so chunks are irrelevant in this case. The loop used to demonstrate the system is basically just a generic image referred to as just an "overlay path". As such, the sectioning shown in these images are on the block level.

Here's this tidbit from how the corkscrew works I wanna quickly mention. (sloop = the corkscrew in EHZ, called a "shuttle loop")

The "ride flag" that it refers to is bit 3 in the status SST ($22) for player 1, or bit 4 for player 2. And sure enough, the corkscrew object (Obj06) makes use of this flag to indicate that the player is running on it. Not quite sure why they refer to it or the "hit" flag as separate bytes, though.

Devon · Dec 31, 2024

Devon said: ↑

ArtLoadCues = divdevtbl
Click to expand...

Okay, so this is my guess for what "div" means here. Maybe it means "divide", since the main function is to effectively split graphics data into chunks that are loaded gradually as the game plays, as to avoid freezing the entire game just to load new graphics.

Devon · Jan 1, 2025

So, those unused variables related to camera scrolling in Sonic 1 and Sonic CD. I have their official names right here, taken from Sonic Gems Collection:

scrar_no = 0xFFF730 / v_unused1

Set to first word in stage's boundary data, which is always 4, but could be changed on a per stage basis

scra_h_keep = 0xFFF732 / v_limitleft

Set to the initial stage's left boundary + 0x240

scrh_flag = 0xFFF740 / v_unused

Cleared on initialization

scrv_flag = 0xFFF741 / v_unused

Cleared on initialization

scr_die = 0xFFF746 / v_unused

Cleared on initialization

scr_timer = 0xFFF748 / v_unused1

Cleared on initialization

I think it's also worth reminding that scra_v_line (0xFFF73E / v_lookshift), the variable that tracks the camera's vertical focal point (for looking up and down), is set to the last word in the stage's boundary data, which is always 0x60, but could be changed on a per stage basis. Makes me wonder what they were planning...

Devon · Jan 2, 2025

Devon said: ↑

scrh_flag = 0xFFF740 / v_unused

Cleared on initialization

scrv_flag = 0xFFF741 / v_unused

Cleared on initialization

Click to expand...

I took a look at the prototype Sonic 1 code, and these 2 do have some functionality. scrh_flag is set if the left and right stage boundaries are the same, and scrv_flag is set if the top and bottom stage boundaries are the same.

While the stage is running, they get checked each frame. If scrh_flag is set, it jumps to loc_4258, and then comes back around to check scrv_flag, which jumps to loc_4276 if set, and then comes back around again to continue the scrolling function.

loc_4258 simply just slowly scrolls the camera towards the left boundary's position.

loc_4276 does the same thing, but vertically, and with the top boundary (plus 0x20, I assume this is might have been related to old HUD code that displayed on the top 32 pixels of the screen? There is unused code that draws a chain of life icons on the window plane, but it does it on the bottom 32 pixels of the screen instead...).

Perhaps this is some sort of auto-scroll functionality that ended up getting removed in the final game? Interesting how it can basically do that for each individual axis, and not just none or both at the same time. And no, this code was not reused for later games that do have auto-scrolling.

Devon · Jan 2, 2025

So, what's up with background Z in the Sonic 1 prototype? Let's start from the top

So, there's a bit of code for testing something related to H-BLANK interrupts. If we look at its code, not only can we see that it affects the H-BLANK interrupt position, but it also shifts "scrz_v_posit", or background Z's Y position. This is the only part in the prototype in which scrz_v_posit is directly manipulated.

Let's take a look at scrz_h_posit, background Z's X position and its relation to stage drawing. There are 3 functions related to drawing backgrounds: scrollwrtb, scrollwrtc, and scrollwrtz. scrollwrtb and scrollwrtc are used, but scrollwrtz is completely unreferenced. scrollwrtb and scrollwrtc call the normal VDP command calculation function vramadrset, but scrollwrtz calls an alternate function that is called vramadrset2. The difference between them is that vramadrset is for writing to VRAM range 0xC000-0xFFFF, while vramadrset2 is for writing to VRAM range 0x8000-0xBFFF.

scrollwrtz's functionality is that it draws a stack of 3 blocks on either the left or right side of the screen, with the Y position being calculated from scrz_v_posit. The way it calculates this Y position explains the inverted movement of its value as seen in watercnt.

On top of this, there is also an unused function for initializing background Z's drawing. What's notable is that it too uses vramadrset2, and unlike the drawing update function, this actually has a little setup code that gives a bit extra information.

As established before, background Z's drawing range is always 3 blocks high, and on initialization, it draws 3 rows of blocks at the bottom of the screen. But, the most interesting part to me is the 2nd line, where d2 is set to 0x6000. So, with it using vramadrset2, that means the calculated VDP command is set to affect VRAM address range 0x8000-0xBFFF. d2 is used in the drawing code to effectively pick out which segment in that address range to work with. The foreground uses 0x4000, which means starting with 0xC000 when using vramadrset, and the background uses 0x6000, which means starting from 0xE000.

In this case, with d2 being 0x6000, this means background Z's segment affects range 0xA000-0xAFFF.

So, now let's take a look at the unused H-BLANK interrupt handler. Here, it changes the VRAM address of the plane B and the sprite table. The stuff with the sprite table doesn't seem to effectively do anything, as it just resets the address to the same default value that it always has and loads from the same standard sprite table buffer as used throughout the game. It probably would have evolved in some way. Regardless, it does lead me to believe that background Z object sprites would have overridden the general game sprites, too.

However, I would like to point out that plane B's address gets set to... 0xA000! The same base address used for background Z drawing! Now it makes sense why scrz_v_posit was used for the H-BLANK interrupt positioning function.

And look here, during initialization, the H-BLANK interrupt counter is set to around 3 blocks above the bottom of the screen, much like how 3 rows of blocks are drawn at the bottom of the screen for background Z!

The only other tidbits that can be explored from here are the fact that background Z's X and Y position get stored into a couple of unused variables (presumably meant to be used while swapping out plane B's address), the option for certain objects to scroll along background Z (and also B and C) and an unfinished implementation of a background Z specific object layout manager. With the last one, all it was programmed to do was continually spawn objects whose X positions are less than (scrz_h_posit + 0x200) & 0xFF80.

So, from what can be gathered here, background Z was going to be this separate plane, whose graphics are drawn in 3 block tall segments, and was designed to override plane B via H-BLANK interrupt at whatever Y position it is set to (scrz_v_posit). I could not tell you for certain what exactly it's for, especially since this was clearly left unfinished, but yeah.

Devon · Jan 3, 2025

So, as it is documented, source code for the debug mode was found in the Sonic 2 Nick Arcade prototype. Some people have already noticed already, but Sonic 1's debug item lists are actually at the bottom, past the "end" directive (minus the one for Green Hill, but that's already normally in the ROM, so...), so if you want more Sonic 1 symbols, here you go:

Code:

edit1tbl:
        dc.w    14
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   kani_act,kanipat,$0400,0,$00            ;3:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;4:
        dcblw   fish_act,fishpat,$0470,0,$00            ;5:
        dcblw   toge_act,togepat,$04a0,0,$00            ;6:
        dcblw   shima_act,shimapat2,$4000,0,$00         ;7:
        dcblw   jyama_act,jyamapat,$66c0,0,$00          ;8:
        dcblw   musi_act,musipat,$04e0,0,$00            ;9:
        dcblw   sjump_act,sjumppat,$04a8,0,$00          ;10:
        dcblw   kamere_act,kamerepat,$249b,0,$00        ;11:
        dcblw   kageb_act,kagebpat,$434c,0,$00          ;12:
        dcblw   save_act,savepat,$26bc,0,$01            ;13:
        dcblw   colichg_act,colichgpat,$26bc,0,$00      ;14:

        -----

edit2tbl:
        dc.w    25
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;3:
        dcblw   fish2_act,fish2pat,$2486,0,$08          ;4:
        dcblw   mogura_act,mogurapat,$84a6,2,$00        ;5:
        dcblw   yari_act,yaripat,$03cc,0,$00            ;6:
        dcblw   yari_act,yaripat,$03cc,3,$02            ;7:
        dcblw   box_act,boxpat,$43de,0,$00              ;8:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;9:
        dcblw   toge_act,togepat,$051b,0,$00            ;10:
        dcblw   dai_act,udaipat,$43bc,0,$04             ;11:
        dcblw   dai3_act,dai3pat,$43e6,0,$01            ;12:
        dcblw   dai3_act,dai3pat,$43e6,1,$13            ;13:
        dcblw   dai3_act,dai3pat,$43e6,0,$05            ;14:
        dcblw   kazari_act,kazaripat,$443e,0,$00        ;15:
        dcblw   dai3_act,dai3pat,$43e6,2,$27            ;16:
        dcblw   dai3_act,dai3pat,$43e6,3,$30            ;17:
        dcblw   kassya_act,kassyapat,$03f6,0,$7f        ;18:
        dcblw   uni_act,unipat,$0467,0,$00              ;19:
        dcblw   awa_act,awapat,$8348,19,$84             ;20:
        dcblw   mizu_act,mizupat,$c259,2,$02            ;21:
        dcblw   mizu_act,mizupat,$c259,9,$09            ;22:
        dcblw   bou_act,boupat,$43de,0,$00              ;23:
        dcblw   ben_act,benpat,$4328,0,$02              ;24:
        dcblw   save_act,savepat,$26bc,0,$01            ;25:

*       dcblw   dai4_act,dai4pat,$41f0,4,$80            ;25:
edit3tbl:
        dc.w    18
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;3:
        dcblw   toge_act,togepat,$051b,0,$00            ;4:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;5:
        dcblw   mfire_act,firepat,$0345,0,$00           ;6:
        dcblw   fblock_act,fblockpat,$4000,0,$00        ;7:
        dcblw   myogan_act,yoganpat,$63a8,0,$00         ;8:
        dcblw   yogan2_act,yogan2pat,$63a8,0,$00        ;9:
        dcblw   box_act,boxpat,$42b8,0,$00              ;10:
        dcblw   yado_act,yadopat,$247b,0,$00            ;11:
        dcblw   bryuka_act,bryukapat,$42b8,0,$00        ;12:
        dcblw   dai_act,daipat,$02b8,0,$00              ;13:
        dcblw   break2_act,break2pat,$62b8,0,$00        ;14:
        dcblw   yoganc_act,yogancpat,$8680,0,$00        ;15:
        dcblw   bat_act,batpat,$04b8,0,$00              ;16:
        dcblw   imo_act,imopat,$24ff,0,$00              ;17:
        dcblw   save_act,savepat,$26bc,0,$01            ;18:
edit4tbl:
        dc.w    15
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   elev_act,elevpat,$4000,0,$00            ;3:
        dcblw   break2_act,break2pat,$44e0,2,$00        ;4:
        dcblw   shima_act,z4daipat,$4000,0,$00          ;5:
        dcblw   pedal_act,pedalpat,$4000,0,$00          ;6:
        dcblw   step_act,steppat,$4000,0,$00            ;7:
        dcblw   fun_act,funpat,$43a0,0,$00              ;8:
        dcblw   sisoo_act,sisoopat,$0374,0,$00          ;9:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;10:
        dcblw   mfire_act,firepat,$0480,0,$00           ;11:
        dcblw   bgspr_act,hassyapat,$44d8,0,$00         ;12:
        dcblw   brobo_act,brobopat,$0400,0,$00          ;13:
        dcblw   uni_act,unipat,$2429,0,$00              ;14:
        dcblw   save_act,savepat,$26bc,0,$01            ;15:
edit5tbl:
        dc.w    15
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   toge_act,togepat,$051b,0,$00            ;3:
        dcblw   sjump_act,sjumppat,$0523,0,$00          ;4:
        dcblw   aruma_act,arumapat,$04b8,0,$00          ;5:
        dcblw   signal_act,signalpat,$0000,0,$00        ;6:
        dcblw   bobin_act,bobinpat,$0380,0,$00          ;7:
        dcblw   kani_act,kanipat,$0400,0,$00            ;8:
        dcblw   hachi_act,hachipat,$0444,0,$00          ;9:
        dcblw   yado_act,yadopat,$247b,0,$00            ;10:
        dcblw   shima_act,z5daipat,$4000,0,$00          ;11:
        dcblw   dai2_act,dai2pat,$4000,0,$00            ;12:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;13:
        dcblw   imo_act,imopat,$24ff,0,$00              ;14:
        dcblw   save_act,savepat,$26bc,0,$01            ;15:
edit6tbl:
        dc.w    29
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   item_act,itempat,$0680,0,$00            ;2:
        dcblw   brobo_act,brobopat,$0400,0,$00          ;3:
        dcblw   uni_act,unipat,$0429,0,$00              ;4:
        dcblw   imo_act,imopat,$22b0,0,$00              ;5:
        dcblw   buranko_act,fetamapat,$4391,2,$07       ;6:
        dcblw   haguruma_act,hagurumapat,$c344,00,$e0   ;7:
        dcblw   dai_act,daipat,$22c0,2,$28              ;8:
        dcblw   switch2_act,switch2pat,$0513,0,$00      ;9:
        dcblw   pata_act,patapat,$4492,0,$03            ;10:
        dcblw   pata_act,yukafpat,$04df,0,$83           ;11:
        dcblw   noko_act,nokopat,$43b5,0,$02            ;12:
        dcblw   break2_act,break2pat,$43f5,0,$00        ;13:
        dcblw   dai_act,daipat,$4460,3,$39              ;14:
        dcblw   dai4_act,dai4pat,$22c0,0,$00            ;15:
        dcblw   door_act,doorpat,$42e8,0,$00            ;16:
        dcblw   dai4_act,dai4pat,$22c0,1,$13            ;17:
        dcblw   noko_act,nokopat,$43b5,0,$01            ;18:
        dcblw   dai4_act,dai4pat,$22c0,1,$24            ;19:
        dcblw   noko_act,nokopat,$43b5,2,$04            ;20:
        dcblw   dai4_act,dai4pat,$22c0,1,$34            ;21:
        dcblw   yukae_act,yukaepat,$44c3,0,$00          ;22:
        dcblw   fire6_act,fire6pat,$83d9,0,$64          ;23:
        dcblw   fire6_act,fire6pat,$83d9,11,$64         ;24:
        dcblw   ele_act,elepat,$047e,0,$04              ;25:
        dcblw   yukai_act,yukaipat,$42f0,0,$00          ;26:
        dcblw   scoli_act,scolipat,$8680,0,$11          ;27:
        dcblw   buta_act,butapat,$2302,0,$04            ;28:
        dcblw   save_act,savepat,$26bc,0,$01            ;29:

*       dcblw   ring_act,playpat,$0780,50,$00           ;28:
*       dcblw   usa_act,usapat,$0448,0,$00              ;5:
*       dcblw   mawaru_act,mawarupat,$4348,16,$00       ;7:

edit7tbl:
        dc.w    02      *13
        dcblw   ring_act,ringpat,$26bc,0,$00            ;1:
        dcblw   ring_act,ringpat,$26bc,8,$00            ;2:
*       dcblw   bobin_act,bobinpat,$0380,0,$00          ;2:
*       dcblw   usagi_act,flicpat,$05a0,0,$0a           ;3
*       dcblw   usagi_act,flicpat,$05a0,0,$0b           ;4
*       dcblw   usagi_act,flicpat,$05a0,0,$0c           ;5
*       dcblw   usagi_act,usagipat,$0553,0,$0d          ;6
*       dcblw   usagi_act,usagipat,$0553,0,$0e          ;7
*       dcblw   usagi_act,pengpat,$0573,0,$0f           ;8
*       dcblw   usagi_act,pengpat,$0573,0,$10           ;9
*       dcblw   usagi_act,azarpat,$0585,0,$11           ;10
*       dcblw   usagi_act,fbutapat,$0593,0,$12          ;11
*       dcblw   usagi_act,niwapat,$0565,0,$13           ;12
*       dcblw   usagi_act,risupat,$05b3,0,$14           ;13

Devon · Jan 4, 2025

So, in Sonic 1 (and also Sonic 2 Nick Arcade, where I got these symbols from), there's a label called "golepat" at the same location as other labels for various special stage blocks, right after the table that defines each block and its graphics. Now, I do believe that the signpost object was called "gole", and its sprite data was probably called "golepat"... so what's up with this one? My theory is that it's just some XDEF/XREF dickery happening here. For those not in the know, the Genesis Sonic games were built using an assembler and linker, and when you have a linker, source files are assembled/compiled individually, and then linked together to make the built program. An "XDEF" marks a symbol as visible to other modules when linking, and an "XREF" tells the assembler that the symbol being referenced comes from another module. In the case of this set of sprite data, what I am thinking is that there is a proper XDEF of the signpost version of "golepat" that can be XREF'd as desired, but here, I believe that the source file that holds the special stage sprite data and tables has its own contained "golepat" symbol specifically to be assigned with the rest of those other labels, and doesn't use an XREF to use the one from the signpost module.

There are other examples of this sort of thing. For example, the ring object's initialization routine is called "ringinit", but so is the function that initializes the HUD's ring counter graphics. The leftover Chopper badnik's animation data is called "fishchg", but so is "bfish"'s. The stegosaurus badnik has a function called "checksonic", but so does the alligator badnik. The Emerald Hill boss has a function called "checkshoot", but so does the Buzzer badnik. Hell, in Sonic CD, Amy has her own version of "speedset", which is normally a global function that updates an object's movement, and also applies gravity, but in Amy's case, her own personal version just calls 2 separate functions called "speedsetx" and "speedsety", which just updates her movement, but on separate axes, and are also only visible to her.

Last thing I will mention is that one of the other labels for the same set of sprites is called "warppat"... one of the blocks that uses it is the "W" block. Make of this info how you will.

Also, here's what I think each label is supposed to represent:
zonepat = unused ZONE blocks
warppat = unused W block
sprevpat = R (reverse) block
golepat = GOAL block
derupat = red/white ghost/gate block
sp1uppat = unused 1-UP block
sphashpat = red/white solid block
koukapat = emerald sparkle
breakpat = diamond block
spuppat = UP block
spdownpat = DOWN block
metpat = ????????? (prototype leftover maybe?)

Devon · Jan 9, 2025

Bump, because I got this to share, from the Sonic 2 Nick Arcade ROM:
Code:
--------------------------------------------------------------------------
 Related assembler work data located around the assembled code (before?)
--------------------------------------------------------------------------
5410C - sisoo (assembler work)
546F8 - wasp (assembler work)
557B8 - seahorse, skyhorse (assembler work)
56424 - redz (assembler work)
5669C - wfish2 (assembler work)
56CCC - gator (assembler work)
57644 - bbat (assembler work)
57FF8 - oct (assembler work)
59304 - bossdriller, driller, drillerguy (assembler work)
5A12C - snail (assembler work)
5A718 - boss1, btama (assembler work)
5B1FC - staff (assembler work)
5C0B0 - bossba, billbomb (assembler work)
--------------------------------------------------------------------------
5C570 - staff (tail end of assembler work)
5D000 - bossba, billbomb (assembler work)
--------------------------------------------------------------------------
5D781 - edit (source code)
--------------------------------------------------------------------------
60BE0 - Title screen logo mappings (tail end of data)
60C20 - Title screen background mappings 1 (old version?)
60EF8 - I have NO clue
--------------------------------------------------------------------------
62230 - pcol (assembler work)
62C48 - masin (assembler work)
65260 - sprscr, sprscractcnt, scrwkchk, scrcnt, sprmapset (assembler work)
66548 - efectwrt, efectmove, efectblockset (assembler work)
67894 - play01 (assembler work)
68464 - edit (assembler work)
69464 - score, scoreup, scoreset (assembler work)
6B5C4 - mapinittbl, divdevtbl (assembler work)
--------------------------------------------------------------------------
Basically, a good chunk of the second "symbol table" is actually just scrap assembler work data for various source files. Any pointers listed as "assembler work" will point to assembled 68000 code, with related assembler data nearby (I think it's right before the assembled code). I did also find a tilemap at 0x60C20 that is meant to go with the title screen that doesn't match any other data in the ROM, or even like Sonic 1. It's also larger than the data that did get used for the ROM.

But yeah, with this, you can find even more symbols, and also even earlier code! I did previously go through this and restored the earlier Emerald Hill boss with the weird janky bobbing animation that's handled by a small table:

I also noticed that the earlier version of "efectwrt" found in this ROM segment actually calls the unused function for shifting Chemical Plant's background (called efectmove). I'll probably comb through more later, but if anyone would like to, I absolutely encourage anyone to take a look for themselves. You will need to go through the assembler work data in order to apply patches to the assembled 68000 code, but it can be reconstructed, as I have shown above.

Devon · Jan 5, 2025

So, I went ahead and extracted the older version of assembled code and assembler/linker data scraps that can be found in the second symbol table of Sonic 2 Nick Arcade. The data provided seems to be late into the build process, seeing as the assembled code already have their addresses resolved. Code and scrap work data are split out, and I did attempt to organize the scrap work data go with the modules they are supposed to go to.

The scrap work data is made up of the following in this order:

Symbols located inside the module

Symbol XDEFs (symbols marked as visible to other modules)

Symbol XREFs (symbols referenced from other modules)

The first one is simple, it's basically just a table of symbols and their offsets within the module. The last 2 are a bit more complex, but pretty easy to understand. You can differentiate them from the first one based on how much more info is packed with the symbol names.

To find the XDEFs within the module, first go to the symbol name you wanna find, then scan back like 4 bytes, and then you'll find the offset.

To find the XREFs within the module, first, go to the symbol name you wanna find. Then, you scan back past the list of longwords whose values are > 0x400000. From there, you will find the list of offsets, whose format is very simple: it starts with a count, and then it lists each offset in the module for that symbol.

Symbol name lengths are stored in units of 4 bytes and are padded out accordingly (i.e. "sisoo", 5 characters, is padded to 8, with its length set to 8/4, or 2).

I'm currently going through this myself and disassembling the code, while also figuring out the rest of the symbols that can be found here, and I do plan on posting my work on GitHub. But, if you wanna take a look for yourself, go crazy. I also made a couple of corrections to my address table for this ROM segment, as I accidentally left out the first 4 bytes in a couple of assembled code modules.

Devon · Jan 6, 2025

Presenting... an updated Sonic 2 Nick Arcade symbol dump!

Turns out that the one that's easily accessible online, particularly on TCRF, is incomplete! I went ahead and went through the ROM myself and filled in the blanks the best I could. I also managed to figure out where certain parts of got cut-out, which allowed me to even correct an error or two. I did manage to find a couple more addresses at those cut-out spots, but they did not have names. However, through some pattern recognition, I was able to figure them out, except for one, which is 0x13606 (appears somewhere around (before?) kaiten).

One interesting thing I found was that there's actually 2 versions of the "bossba" assembler/linker scrap work data hidden in the ROM. While the code is the same, the pointers are slightly different. As such, I've also updated their symbols as to document both versions. On top of that, I also found a section that contained several "JmpTo" instructions in groups at 0x4EA8C, which appears to have been created for yet another earlier build with slight address differences. Through further pattern recognition, I was able to find that one of them was for "actchkwk2", which is actually one of the symbols that was affected by the "bossba" thing, so it gets 3 unique values! Unfortunately, I could not figure out the names for 0x18A82 and 0x19A3C, as there's simply not enough context for them (both of them are in their own individual groups, all by themselves).

Without further ado... enjoy!

Code:

bossvac             000000 (dummied out)
vacumeguy           000000 (dummied out)
explode             000000 (dummied out)
ascii               0004E8
bgmset              0012F6
soundset            0012FC
dmactrset           0013A0
mapdevr             00170E
random              002AF0
sinset              002B16
atan                002DAE
burankoposiset      007D6A
burankoposiset2     007DAE
burankopat          007EAE
buranko0dpat        007EDA
ballpat             007F4A
shimapat2           0084AE
dai00pat            008556
pltfrmpat           008C64
frntlitpat          008E04
kanipat             009C84
hachipat            009FC2
ringgetsub          00A236
ringpat             00A54A
itempat             00ABF0
fishpat             00B11E
togepat             00C17E
jyamapat            00C202
speedset            00C706
speedset2           00C732
actionsub           00C758
frameoutchk         00C7AE
frameoutchkd        00C81A
frameout            00C88E
patchg              00C89C
spatsetsub          00CB26
dualmodesub         00CFC2
dualmodesub2        00CFDE
ringcolchk          00D2F0
actwkchk            00DAA2
actwkchk2           00DAB8 | 00DAB0 | 00DAC8
sjumppat            00E0B4
banepat             00E12C
kamerepat           00E4A8
kagebpat            00E640
goleset             00E80A
musipat             00EA80
atariridesub        00EB1C
ridechksub_t        00EEC0
jumpcolsub          00FDCC
patchgmain          00FF82
playwrt             01029A
emycol_d            0128C6
savepat             012D74
bobinpat            013002
colichg             01349C
.jump$zdba          0134B6
.frameoutd2$zdba    0134BE
.frameout$zdba      0134D4
.frameout2$zdba     0134E6
colichg_move_tbl    0134EA
colichgmove         01352A
.loop$ceba          013556
.jump2$ceba         013594
.jump3$ceba         0135A2
.jump4$ceba         0135C0
.end2$ceba          0135D0
.end1$ceba          0135D4
.end$ceba           0135E0
colichgtbl          0135E2
colichgpat          013602
kaiten              01364C
kaiten_move_tbl     01365A
kaiteninit          013660
kaiteninit2         0136B4
kaitenmove          0136C2
.jump1$rdba         0136DA
.jump2$rdba         0136E0
kaitenmove2         0136EC
.jump3$sdba         013706
.jump4$sdba         01371E
kaitenchg           013722
kaitenchg0          013726
kaitenchg1          01372E
kaitenpat           013736
kaitensp0           013740
kaitensp1           01374A
kaitensp2           013754
kaitensp3           01375E
kaitensp4           013768
prodai              013774
prodai_move_tbl     013782
prodaiinit          013786
prodaimove          0137E6
.jump0$vdba         013806
.jump$vdba          013824
.jump2$vdba         013834
.jump3$vdba         013838
.jump4$vdba         01384A
prodaipat           01385E
prodaisp0           013860
gem                 013874
gem_move_tbl        013882
geminit             013886
gemmove             0138AE
gemfoutchk          0138C2
gempat              0138DA
gemsp00             0138DC
wfall               0138F0
wfall_move_tbl      0138FE
wfallinit           013904
.sub$rdba           01396C
.worknai$rdba       0139AE
.end$rdba           0139B0
wfallmove           0139CA
.jump$sdba          0139E2
.jump2$sdba         0139FC
.jump5$sdba         013A14
.jump4$sdba         013A1C
.jump3$sdba         013A34
wfallmove2          013A54
wfallpat            013A6C
wfallsp19           013AA4
wfallsp00           013AA6
wfallsp01           013AB0
wfallsp02           013AC2
wfallsp03           013AD4
wfallsp04           013AEE
wfallsp05           013B08
wfallsp06           013B2A
wfallsp07           013B4C
wfallsp08           013B76
wfallsp09           013BA0
wfallsp10           013BD2
wfallsp11           013C04
wfallsp12           013C3E
wfallsp13           013C78
wfallsp14           013CBA
wfallsp15           013CFC
wfallsp16           013D46
wfallsp17           013D46
wfallsp18           013D46
wfallsp20           013D58
wfallsp21           013D62
wfallsp22           013D6C
wfallsp23           013D7E
wfallsp24           013D90
wfallsp25           013DAA
wfallsp26           013DC4
wfallsp27           013DE6
sloop               013E08
.frameoutd$wdba     013E1E
.frameout$wdba      013E32
sloop_move_tbl      013E38
sloopinit           013E3C
sloopmove           013E46
.sub$zdba           013E54
.left$zdba          013E7C
.right$zdba         013E8A
.jump$zdba          013E96
.plrideon$zdba      013EAE
.left2$zdba         013EBC
.right2$zdba        013ECA
.jump0$zdba         013ED6
.end$zdba           013EEC
.rideon$zdba        013EEE
.jumps$zdba         013EF6
.jump1$zdba         013F18
.jump2$zdba         013F24
sloopdirtbl         013F56
slooptbl            013F8A
sisoo               01412C
sisoo_move_tbl      014152
sisooinit           01415E
.worknai$feba       0141B8
.jump$feba          0141C6
sisoomove           0141CC
.rideon$geba        0141D8
.jump$geba          0141EC
.jump2$geba         0141F4
.jump3$geba         014210
.jump4$geba         014218
.jump44$geba        014222
.noride$geba        014226
.jump5$geba         014242
.jump6$geba         01424A
.jump7$geba         01424A
.jump8$geba         014262
sisooride           01427E
sisoosub            014280
.jump$ieba          014294
sisoosub2           01429C
.jump2$ieba         01429C
.jump3$jeba         0142A8
.end$jeba           0142C6
sballinit           0142C8
.jump$keba          014328
sballwait           014328
.jump$leba          01433C
.jump3$leba         014362
.jump2$leba         014378
.jump4$leba         01437E
.jump0$leba         01439C
sballmove           0143BC
.up$meba            0143C2
.end$meba           0143D8
.down$meba          0143DA
.jump0$meba         0143FA
.jump$meba          014418
.jump1$meba         014434
.jump2$meba         014442
.jump3$meba         01444E
.sub$meba           014450
sballtbl            014480
sisootbl            01448A
sisootbl2           0144BB
sisoopat            0144EC
sisoosp0            0144F4
sisoosp1            014536
sballpat            014578
sballsp0            01457C
sballsp1            01457C
water               014588
water_move_tbl      014596
waterinit           01459A
watermove           0145C2
.jump0$ceba         0145E4
.jump1$ceba         0145F4
.jump2$ceba         0145F4
waterpattbl         014614
waterpat            014654
watersp0            014660
watersp1            01467A
watersp2            014694
watersp3            0146AE
watersp4            0146E0
watersp5            014712
taki                014744
taki_move_tbl       014752
takiinit            014756
takimove            014790
.frameoutd$oeba     0147AA
.jump$oeba          0147DC
.end$oeba           0147EE
takipat             0147F6
takisp00            0147FE
takisp01            014810
takisp02            014882
takisp03            014884
stego               0148D0
stego_move_tbl      0148DE
stegoinit           0148E2
.end$pdba           014930
stegomove           014932
stegomove_tbl       01494E
stego_0             014952
.jump$sdba          014974
stego_1             014976
.end$tdba           01499A
.jump2$tdba         01499C
checksonic          0149C0
.lft$udba           0149CA
.out$udba           0149E4
.out0$udba          0149E6
.rt$udba            0149F4
.out1$udba          014A10
stegochg            014A1E
stegochg00          014A24
stegochg01          014A32
stegochg02          014A35
stegopat            014A3A
stegosp00           014A4A
stegosp01           014A74
stegosp02           014A9E
stegosp03           014AC8
stegosp04           014AF2
stegosp05           014B1C
stegosp06           014B46
stegosp07           014B68
bfish2              014BA0
bfish               014BA0
fish2_move_tbl      014BAE
fish2init           014BB4
fish2move           014C2C
.jump$ydba          014C2C
.skip$zdba          014C38
.jump$zdba          014C5A
fish2jump           014C9C
.level$aeba         014CF4
.below$aeba         014D08
.join$aeba          014D22
waterspeedset       014D4C
.sub$beba           014D80
.cnt$beba           014D88
fishchg             014D9A
fishchg0            014DA2
fishchg1            014DA6
fishchg2            014DAA
fishchg3            014DAE
bfish2pat           014DB2
bfishpat            014DB2
fish1sp0            014DBA
fish1sp1            014DC4
fish1sp2            014DCE
fish1sp3            014DD8
redz                014DF8
redz_move_tbl       014E06
redzinit            014E0C
.end$pdba           014E60
redzmove            014E62
.frameout$qdba      014E92
.frameout2$qdba     014EA4
redzmove_tbl        014EA8
redz_0              014EAC
.jump$sdba          014ECE
redz_1              014ED0
.end$tdba           014EEA
.jump2$tdba         014EEC
redzdie             014F04
redzchg             014F08
redzchg0            014F0C
redzchg1            014F0F
redzpat             014F16
redzsp0             014F1C
redzsp1             014F26
redzsp2             014F30
seahorse            014F5C
seahorse_move_tbl   014F6A
seahorseinit        014F76
.worknai$vdba       01502E
seahorsemove        01502E
seahorsemove_tbl    015054
seahorsewings       01505A
seahorseshot        015084
seahorseswim        01509A
seahorsefloat       0150AC
seahorseattack      0150BA
chkshot             0150CC
.end$deba           0150D8
.makeshot$deba      0150DA
.ok$deba            01513A
.worknai$deba       015146
chkatkdone          015148
.end$eeba           01516E
chkatack            015170
.toleft$feba        01519E
.toright$feba       0151AE
.edge$feba          0151BC
.end$feba           0151D6
chkfloat            0151D8
.vel$geba           0151F4
.end$geba           0151F8
chkfltdone          0151FA
.end$heba           015216
.down$heba          015218
fixwings            01522C
.normal$ieba        01525C
shotdrops           015266
hitground           01527C
.end$keba           015296
oilslip             0152A2
updatoil            0152A6
.end$oeba           0152E2
.done$oeba          0152E4
landedyet           0152F2
.end$peba           015330
chkflip             015332
.jump$qeba          01534E
chkhit              015350
.loop$reba          01535A
.left$reba          0153B8
.r1$reba            0153C6
.worknai$reba       0153CC
.out$reba           0153EE
.end$reba           0153F2
horsechg            0153F4
seahorsechg0        015404
seahorsechg1        015407
horsechg2           01540F
seahorsechg3        015415
seahorsechg4        015419
seahorsechg5        01541C
skyhorsechg0        01541F
skyhorsechg1        015423
horsepat            01542C
seahorsesp00        015446
seahorsesp01        015460
seahorsesp02        01546A
seahorsesp03        015474
seahorsesp04        015496
horsesp05           0154B8
horsesp06           0154C2
horsesp07           0154CC
horsesp08           0154D6
skyhorsesp00        0154E0
skyhorsesp01        015502
skyhorsesp02        015524
skyhorsesp03        01554E
skyhorse            015578
skyhorse_move_tbl   015586
skyhorseinit        015592
skyhorsemove        0155F0
skyhorsemove_tbl    015610
skyhorseshot        015614
skyhorsefly         015628
skyhorseattack      01563E
shotstatus          015654
.done$bgba          015668
getposition         01567A
.toleft$cgba        01569A
.setbehind$cgba     0156A2
.next$cgba          0156A6
.above$cgba         0156C6
.out$cgba           0156CA
chkshoot            0156CC
.end$dgba           0156F0
makeshot            0156F2
.ok$egba            01574E
.worknai$egba       01575A
seeksonic           01575C
.above$fgba         015768
.speed$fgba         015784
.below$fgba         01578C
.negspeed$fgba      0157A8
.end$fgba           0157B0
.out$fgba           0157BA
wasp                0157E0
wasp_move_tbl       0157F2
waspshot            0157FA
waspafterb          01580C
.cnt$feba           01581E
waspinit            015844
.done$geba          0158E6
waspmove            0158E8
waspmove_tbl        015904
waspfly             015908
.here$jeba          015926
.end$jeba           01592C
.here2$jeba         01592E
checkshoot          01594A
.cnt$keba           015960
.toleft$keba        01597A
.sht$keba           015982
.out$keba           015996
waspshoot           015998
.done$leba          0159AC
.here$leba          0159B2
.out$leba           015A16
waspchg             015A18
waspchg00           015A20
waspchg01           015A23
waspchg02           015A27
waspchg03           015A2B
wasppat             015A34
waspsp00            015A42
waspsp01            015A54
waspsp02            015A6E
waspsp03            015A88
waspsp04            015A92
waspsp05            015A9C
waspsp06            015AA6
oct                 015AC8
oct_move_tbl        015AD6
octshot             015ADE
.cnt$pdba           015AE8
octeye              015AFA
octinit             015B06
.end$rdba           015B64
octmove             015B6C
octmove_tbl         015B88
octstand            015B90
.done$udba          015BAE
octfly              015BB0
.end$vdba           015BD0
octshoot            015BD2
.end0$wdba          015C38
.end$wdba           015C9C
.out$wdba           015C9E
octleave            015CA4
.cnt$xdba           015CB2
octchg              015CBA
octchg00            015CC0
octchg01            015CC3
octchg02            015CC8
octpat              015CCC
octsp00             015CDA
octsp01             015CEC
octsp02             015D06
octsp03             015D20
octsp04             015D3A
octsp05             015D44
octsp06             015D4E
bbat                015D78
bat_move_tbl        015D86
batinit             015D8C
batmove             015DCA
batmove_tbl         015DEA
setposi             015DF0
seekchk             015E0A
.end$xdba           015E36
batattack           015E38
fixme               015E58
.end$zdba           015E6A
attackchk           015E6C
.cnt$aeba           015E90
.end$aeba           015EB6
.gone$aeba          015EB8
.norm$aeba          015EC4
direcchg            015ED8
.end$beba           015EF0
.rt$beba            015EF2
.done$beba          015F06
moveset             015F36
bathover            015F56
.end$deba           015F8C
batflap             015F8E
.end$eeba           015F98
batseek             015F9A
.here$feba          015FC8
.cnt$feba           015FE0
batchg              015FE2
batchg00            015FEA
batchg01            015FEE
batchg02            015FFD
batchg03            01600E
bbatpat             016016
batsp00             016034
batsp01             016056
batsp02             016078
batsp03             01609A
batsp04             0160BC
batsp05             0160D6
batsp06             0160F8
batsp07             01611A
batsp08             01613C
batsp09             01615E
batsp10             016178
batsp11             016192
batsp12             0161AC
batsp13             0161BE
batsp14             0161D0
gator               016200
gator_move_tbl      01620E
gatorinit           016212
.end$pdba           016260
gatormove           016262
gatormove_tbl       01627E
gator_0             016282
.jump$sdba          0162A4
gator_1             0162A6
.end$tdba           0162C4
.jump2$tdba         0162C6
checksonic          0162DE
.lft$udba           0162E8
.rt$udba            0162F8
.set$udba           016306
.out$udba           01630E
gatorchg            016316
gatorchg00          01631C
gatorchg01          016324
gatorchg02          016327
gatorpat            016330
gatorsp00           016348
gatorsp01           01636A
gatorsp02           01638C
gatorsp03           0163AE
gatorsp04           0163D0
gatorsp05           0163F2
gatorsp06           016414
gatorsp07           016436
gatorsp08           016458
gatorsp09           01647A
gatorsp10           01649C
gatorsp11           0164BE
wfish2              0164F8
wfish_move_tbl      01650A
wfishinit           01650E
wfishmove           016548
.jump$beba          016570
.jump2$beba         016592
wfishchg            016594
wfishchg0           01659A
wfishchg1           01659E
wfishchg2           0165A2
wfish2pat           0165A6
fishsp0             0165AA
fishsp1             0165C4
snail               0165F8
snail_move_tbl      01660A
snailinit           016614
.out1$deba          016694
.cnt$deba           0166A6
snailmove           0166AC
.jump$eeba          0166D8
chkcharge           0166F4
.toleft$feba        016712
.toright$feba       01671C
.doit$feba          016724
.done$feba          016736
makeafb             016738
.out$geba           016790
afbupdate           016792
.cnt$heba           0167BA
snailturn           0167CC
updateparts         016804
snailchg            01682C
snailchg0           016830
snailchg1           016834
snailpat            016838
snailsp0            01683E
snailsp1            016850
snailsp2            016862
bossdriller         016890 | 016888
bossdrillmove_tbl   01689E
moveonscreen        0168AA
.done$oeba          0168C2
joincar             0168D0
join_tbl            0168DE
joinland            0168E2
.joined$reba        0168F4
joinadjust          016908
movecar             01692C
tbl                 01696C
deathstart          016970
.jump$veba          016978
.end$veba           0169A4
deathdrop           0169A6
flyaway             0169C0
flyaway_tbl         0169D2
initrotors          0169D8
takeoff             016A4C
.end$afba           016A64
runaway             016A66
.out$bfba           016A7A
checkflip           016A7C
.off$cfba           016A8C
.done$cfba          016A9C
checkhit            016A9E
.jump$dfba          016AC8
.jump1$dfba         016AD6
.jump2$dfba         016AE4
.die$dfba           016AE6
driller             016B00
driller_tbl         016B0E
growrotors          016B18
sticktoboss         016B3C
stick_tbl           016B4A
normal              016B4E
.cnt$ofba           016B72
retract             016B98
.done$pfba          016BB4
carbody             016BC2
tiremove            016C04
tiremove_tbl        016C12
tiresit             016C1A
tireroll            016C38
.cnt$ufba           016C5A
tireexplode         016C70
tirebounce          016CA0
.end$wfba           016CBE
drill               016CC2
.cnt$xfba           016D10
.movedrill$xfba     016D22
.cnt3$xfba          016D30
checkshoot          016D42
.chkset$yfba        016D4C
.right$yfba         016D56
.left$yfba          016D60
.set$yfba           016D6A
makewheels          016D72
.worknai1$zfba      016DE6
.worknai2$zfba      016E5A
.worknai3$zfba      016ECE
.worknai4$zfba      016F2A
drillerguy          016F2C | 016F24
.worknai$cgba       016F70
.worknai2$cgba      016FD0
bosshelichg         016FD2
bosshelichg0        016FD8
bosshelichg1        016FDC
bosshelichg2        016FF2
bosshelipat         01700C
bosshelisp00        01701A
bosshelisp01        017024
bosshelisp02        01704E
bosshelisp03        017078
bosshelisp04        017092
bosshelisp05        0170AC
bosshelisp06        0170C6
bossdrillchg        0170E0
bossdrillchg0       0170E6
bossdrillchg1       0170EB
bossdrillchg2       0170EF
bossdrillpat        0170F4
bossdrillsp0        017104
bossdrillsp1        01711E
bossdrillsp2        017128
bossdrillsp3        017132
bossdrillsp4        01713C
bossdrillsp5        017146
bossdrillsp6        017150
bossdrillsp7        01715A
bossba              017194 | 01718C
bossba_move_tbl     0171A2 | 01719A
bossbainit          0171AC | 0171A4
.cnt$geba           0171F8 | 0171F0
.cnt2$geba          01725C | 017254
.worknai$geba       0172B0 | 0172A8
bossbaappendage     0172C2 | 0172BA
bossbamove          0172CA | 0172C2
bossbamove_tbl      017300 | 0172F8
bossbatop           017308 | 017300
afbtbl              017336 | 01732E
bossafb             01733A | 017332
.cnt$neba           017378 | 017370
.jump$neba          017382
.hurt$neba          01738E | 017386
.here$neba          01739C | 017394
bosssm              0173D8 | 0173D0
.jump$oeba          01741A
billbomb            01741E | 017416
billbomb_tbl        01742C | 017424
billbombinit        017430 | 017428
billbombmove        017468 | 017460
.jump$seba          017482 | 01747A
bossafbpat          017486 | 01747E
afbsp00             01748A | 017482
afbsp01             017494 | 01748C
bosssmpat           01749E | 017496
smbsp00             0174A6 | 01749E
smbsp01             0174B0 | 0174A8
smbsp02             0174BA | 0174B2
smbsp03             0174C4 | 0174BC
billbombpat         0174CE | 0174C6
bossbmsp00          0174DC | 0174D4
bossbmsp01          0174E6 | 0174DE
bossbmsp02          0174F0 | 0174E8
bossbmsp03          0174FA | 0174F2
bossbmsp04          017504 | 0174FC
bossbmsp05          01750E | 017506
bossbmsp06          017518 | 017510
bossbachg           017522 | 01751A
bossbachg1          017526 | 01751E
bossbachg2          017529 | 017521
bossbapat           01752E | 017526
bossbasp00          017534 | 01752C
bossbasp01          017556 | 01754E
bossbasp02          017578 | 017570
staff               0175A8
staff_move_tbl      0175B6
staff_init          0175BA
staff_move          017628
.jump$ndba          017628
staffpat            01762E
staffsp00           017644
staffsp01           0176B6
staffsp02           017738
staffsp03           01778A
staffsp04           01784C
staffsp05           0178EE
staffsp06           0179C0
staffsp07           017A7A
staffsp08           017B74
staffsp09           017BEE
staffsp10           017C30
boss1               017CC4
boss1_move_tbl      017CD2
boss1tbl            017CDA
boss1init           017CE0
.loop$kdba          017CEA
.jump$kdba          017CF2
.worknai$kdba       017D38
boss1move           017D50
boss1move_tbl       017D82
boss1_0             017D90
boss_ysub           017DAC
.end$ndba           017DAC
.jump$odba          017DF4
.jump1$odba         017E02
.jump2$odba         017E10
.die$odba           017E12
bossbomb            017E26
.worknai$pdba       017E68
.jump$pdba          017E68
speedset_m          017E6A
boss1_1             017E90
.worknai$rdba       017ED6
.end$rdba           017EDC
boss1_2             017EE0
.jump$sdba          017F0A
.jump2$sdba         017F16
boss1_3             017F1A
.jump2$tdba         017F26
.end$tdba           017F3C
boss1_4             017F40
.jump$udba          017F4A
.end$udba           017F70
boss1_5             017F72
.falling$vdba       017F7A
.turn$vdba          017F82
.rise_up$vdba       017F88
.go_up$vdba         017FA0
.fire$vdba          017FA8
.exit$vdba          017FB6
boss1_6             017FBE
.jump$wdba          017FD8
.jump2$wdba         017FDE
.frameout$wdba      017FE6
boss1oyaji          017FEE
.pass0$xdba         018008
.pass1$xdba         018010
.pass2$xdba         01801A
.jump$xdba          018024
.jump0$xdba         018038
.frameout$xdba      01803A
boss1fire           018040
.jump0$ydba         018060
.jump$ydba          01806C
.frameout$ydba      01806E
boss1sub            018074
btama               0180AE
btama_move_tbl      0180BC
btamainit           0180C6
.loop$jeba          0180F6
.jump$jeba          018132
.worknai$jeba       01815C
btamalentbl         018188
btamamove           01818E
.loop$leba          01819A
.jump$leba          0181B4
.jump2$leba         0181CE
.jump3$leba         0181DA
btamamove2          0181EE
btamasub            0181FE
.pass$neba          018210
.jump$neba          01823A
btamakusari         01823C
.jump$oeba          018252 | 017412
btamatama           018258
.jump0$peba         018262
.jump$peba          01828A
boss1chg            018290
boss1chg0           0182A8
boss1chg1           0182AB
boss1chg2           0182AF
boss1chg3           0182B3
boss1chg4           0182B7
boss1chg5           0182BB
boss1chg6           0182BF
boss1chg7           0182C3
boss1chg8           0182C6
boss1chg9           0182CA
boss1chg10          0182CE
boss1chg11          0182D1
boss1pat            0182DC
boss1sp0            0182F6
boss1sp1            018328
boss1sp2            01833A
boss1sp3            01834C
boss1sp4            018366
boss1sp5            018380
boss1sp6            01839A
boss1sp7            0183B4
boss1sp8            0183D6
boss1sp9            0183E0
boss1sp10           0183EA
boss1sp11           0183EC
boss1sp12           0183FE
boss2pat            018410
boss2sp0            018420
boss2sp1            01842A
boss2sp2            01843C
boss2sp3            018446
boss2sp4            018450
boss2sp5            01845A
boss2sp6            01847C
boss2sp7            01848E
masin               0184AC
.frameout$edba      0184D2
masin_move_tbl      0184D8
masintbl            0184E8
masininit           0184F8
.end$hdba           018544
masinmove           018546
.jump$idba          018564
.jump2$idba         01857A
masinswitch         018582
.jump$jdba          0185E8
masinbomb           0185EA
masincenter         0185EA
masincenter2        0185EA
.worknai$mdba       018628
.jump$mdba          018628
.end$mdba           01862E
.bombend$mdba       018630
.lp$mdba            018656
.no_work_left$mdba  018680
masinusagi          018682
.pass$ndba          0186B6
.worknai$ndba       0186C0
.jump$ndba          0186C0
.end$ndba           0186D0
masinclear          0186D2
.lp$odba            0186DC
.end$odba           0186F2
masinchg            0186F4
masinchg0           0186F8
masinchg1           0186F8
masinpat            0186FC
masinsp0            01870A
masinsp1            018744
masinsp2            01874E
masinsp3            018780
masinsp4            01878A
masinsp5            01879C
masinsp6            0187A6
pcol                0187B0
.jump0$ldba         0187DA
.loop$ldba          0187E8
.jump$ldba          0187EE
.colitbl$ldba       0187FA
.jump2$ldba         018842
.jump3$ldba         018864
.jump4$ldba         01886A
.jump5$ldba         018882
.atari$ldba         018888
pcolitem            0188A2
.ring$mdba          0188B0
.ringe$mdba         0188C0
.item$mdba          0188C2
.item2$mdba         0188EE
.iteme$mdba         018900
pcolnomal           018902
.jump$ndba          01891A
.jump4$ndba         018942
.jump0$ndba         018944
.jump5$ndba         01895C
.jump6$ndba         018976
.jump3$ndba         018986
.jump1$ndba         01899C
.jump2$ndba         0189A4
escoretbl           0189AC
pcolplay2           0189B4
pcolplay            0189BA
pcolend             0189C0
pcole               0189C4
playdamageset       0189CE
.worknai$tdba       0189F6
.damage$tdba        0189F6
.jump0$tdba         018A2C
.jump$tdba          018A3A
.jump2$tdba         018A60
.end$tdba           018A66
.die$tdba           018A6A
playdieset          018A72
.jump2$udba         018AC0
.end$udba           018AC6
pcolspecial         018ACA
.imo$vdba           018AEC
.yado$vdba          018AF0
.yado1$vdba         018B0A
.yado2$vdba         018B16
.yado3$vdba         018B1A
.yado4$vdba         018B1E
.bobin$vdba         018B22
.bobin2$vdba        018B2E
.bou$vdba           018B34
sprscr              018B48
.loop$ndba          018B98
.loop2$ndba         018BBA
sprscre             018BDC
sprscrset           018BDC
.loop$pdba          018C06
.loop2$pdba         018C0A
.jump$pdba          018C62
.end$pdba           018C82
sprscractcnt        018C8A
.loop$qdba          018C9E
.jump2$qdba         018CC2
.jump4$qdba         018CDE
.jump5$qdba         018D20
.jump3$qdba         018D4A
scractofftbl        018E34
scrwkchk            018EB4
.loop$sdba          018EBE
.jump$sdba          018EC8
scrcnt              018ECA
.loop$tdba          018ED4
.jump$tdba          018EE2
scracttbl           018EEA
scr_ring            018F02
.end$vdba           018F2A
.jump$vdba          018F2A
scr_ringtbl         018F2C
scr_bobin           018F32
.jump$xdba          018F5E
.end$xdba           018F60
scr_bobintbl        018F62
scr_1up             018F68
.end$zdba           018F90
.jump$zdba          018F90
scr_1uptbl          018F92
scr_revers          018F98
.jump$beba          018FC4
.end$beba           018FC6
scr_reverstbl       018FC8
scr_houseki         018FCE
.jump$deba          019006
.end$deba           019006
scr_housekitbl      019008
scr_break           01900E
.jump$feba          01903A
.end$feba           01903A
scr_breaktbl        01903C
sprmapsettbl        019046
sprplaypositbl      01905E
sprmapset           019076
.jump$jeba          01908E
.loop0$jeba         0190A4
.jump0$jeba         0190AC
.jump2$jeba         0190B0
.loop$jeba          0190DC
.loop1$jeba         0190F0
.loop2$jeba         0190F2
scrpatset           019100
.loop$keba          01910E
scrcntclr           019120
.loop$leba          01912A
scrpattbl           019132
metpat              019306
sprevpat            019306
zonepat             019306
derupat             019306
sp1uppat            019306
golepat             019306
warppat             019306
golesp0             01930C
golesp1             019312
derusp2             019318
sphashpat           01931A
koukapat            01931A
breakpat            01931A
koukasp0            019322
sphashsp0           019322
koukasp1            019328
sphashsp1           019328
koukasp2            01932E
koukasp3            019334
spuppat             01933A
spupsp0             01933E
spupsp1             019344
spdownpat           01934A
spdownsp0           01934E
spdownsp1           019354
hous0pat            01935A
hous1pat            01935E
hous2pat            019362
sphoussp0           019366
sphoussp1           01936C
sphoussp2           019372
sphoussp3           019378
play01              019380
.jump$neba          01938E
play01_move_tbl     01939C
play01init          0193A4
play01move          0193E4
.jump5$qeba         0193F8
play01move_tbl      01941C
play01walk          019420
play01jump          01942E
play01sub           01943A
splevermove         019460
.jump5$veba         01946C
.jump6$veba         019478
.right$veba         01948A
.right2$veba        019494
.left$veba          01949A
.left2$veba         0194A4
.jump7$veba         0194A8
.jump$veba          0194F2
spplwalk_l          0194F8
.left$weba          019506
.left2$weba         019514
.right$weba         01951A
.right2$weba        019522
spplwalk_r          019528
.right$xeba         019534
.right2$xeba        019542
.left$xeba          019548
.left2$xeba         019550
.rightcol$xeba      019554
spjumpchk           019556
.end$yeba           019598
spjumpchk2          01959A
.end$zeba           0195B4
playscr             0195B6
.jump$afba          0195CE
.jump2$afba         0195DE
play01gole          0195E0
.jump0$bfba         0195F4
.jump$bfba          019612
play01gole2         019634
.end$cfba           019640
rotspdset           019656
.jump2$dfba         0196B0
.jump3$dfba         0196C6
.jump4$dfba         0196D4
spcol               0196E8
spcol2              0196E8
spcolsub            019730
.end$gfba           019744
.jump2$gfba         019746
spcol_ev            019752
spcolsub_ev         01978C
.worknai$ifba       0197A0
.jump$ifba          0197C4
.jump2$ifba         0197C8
.worknai2$ifba      0197DC
.jump3$ifba         0197F2
.worknai3$ifba      01980C
.jump33$ifba        01982A
.jump4$ifba         019838
.jump5$ifba         019844
.jump6$ifba         019858
derusub             01985C
.loop1$jfba         01986C
.loop2$jfba         01986E
.jump$jfba          019878
.end$jfba           019886
bobinchk            01988E
.jmp$kfba           0198A0
.jmp2$kfba          0198AC
.jump$kfba          0198AE
.worknai$kfba       01991C
.jump2$kfba         019926
.jump3$kfba         01993C
.jump33$kfba        019966
.jump4$kfba         019970
.jump44$kfba        01999A
.jump5$kfba         0199A4
.worknai2$kfba      0199CC
.jump6$kfba         0199DA
.jump66$kfba        0199F2
.jump666$kfba       019A12
.worknai3$kfba      019A16
.end$kfba           019A20
.jump7$kfba         019A20
play02              019A22
efectwrt            019A2C
.end$wdba           019A4A
efecttbl            019A4C
efstagea            019A8C
efstageb            019A8C
efstagec            019A8C
efstagee            019A8C
efstagef            019A8C
efstage1            019A8C
efstage5            019A8C
efstage6            019A8C
efstage7            019A8C
efstage9            019A8C
efstage0            019A8E
efstaged            019A90
efstage2            019A90
efstage3            019A90
efstage4            019A90
efstage8            019A90
.loop$neba          019A96
.jump$neba          019AAC | 01737A
.jump1$neba         019ABA
.jump2$neba         019ADC
.jump3$neba         019AE6
efecttbl0           019AF8
efecttbl3           019AF8
efecttbl4           019B56
efecttbl8           019B56
efecttbl1           019B82
efecttbl2           019B82
efecttbl5           019B82
efecttbl6           019B82
efecttbl7           019B82
efecttbl9           019B82
efecttbla           019B82
efecttblb           019B82
efecttblc           019B82
efecttbld           019B82
efecttble           019B82
efecttblf           019B82
efectmove           019BEA
.end$efba           019BF2
.jump$efba          019BF4
.sub$efba           019C24
.loop$efba          019C28
efectblockset       019CBE
.loop$ffba          019CE0
.end$ffba           019CE6
.loop2$ffba         019CE8
efectblocktbl       019D00
zone00pcblk         019D20
zone03pcblk         019D20
zone0apcblk         019D5C
zone0bpcblk         019D5C
zone0cpcblk         019D5C
zone0epcblk         019D5C
zone0fpcblk         019D5C
zone09pcblk         019D5C
zone07pcblk         019D5C
zone01pcblk         019D5C
zone05pcblk         019D5C
zone06pcblk         019D5C
zone0dpcblk         019E9A
zone02pcblk         019E9A
zone08pcblk         019F7E
zone04pcblk         019F7E
score               01A074
score_move_tbl      01A082
score_init          01A086
score_move          01A0B4
.jump0$udba         01A0CE
.jump$udba          01A0D8
.jump2$udba         01A0EE
scorepat            01A0F8
scoresp0            01A100
scoresp1            01A152
scoresp2            01A1A4
scoresp3            01A1F6
scoreup             01A248
.jump$aeba          01A260
.jumpus$aeba        01A288
.jump0$aeba         01A288
scoreset            01A28A
.jump$beba          01A2B2
.jump1$beba         01A2BE
.jump2$beba         01A2D2
.jump3$beba         01A30E
.jump4$beba         01A32E
.jump5$beba         01A33C
.jump6$beba         01A364
.timeover$beba      01A366
scoreset2           01A37C
.jump1$ceba         01A38C
.jump2$ceba         01A3A0
.jump3$ceba         01A3B0
.jump4$ceba         01A3BE
.jump5$ceba         01A3E6
ringinit            01A3E8
scoreinit           01A3FC
scoreinitsub        01A418
.loop$feba          01A41C
.loop1$feba         01A42C
.jump$feba          01A432
.loop2$feba         01A438
.spaceset$feba      01A438
scoreinittbl        01A444
ringinittbl         01A450
posiwrt             01A454
hexwrtw             01A47C
.loop$jeba          01A484
.jump$jeba          01A496
.jump5$jeba         01A4AC
ringwrt             01A4B4
scorewrt            01A4BE
scorewrt2           01A4C6
.loop$meba          01A4CC
.jump2$meba         01A4D0
.jump3$meba         01A4D8
.jump4$meba         01A4E2
.jump5$meba         01A510
contwrt             01A51C
.loop$neba          01A53A
.jump2$neba         01A53E
.jump3$neba         01A546
subtbl              01A574
subtbl4             01A57C
subtbl3             01A580
subtbl2             01A584
subtbl1             01A588
timewrt1            01A58C
timewrt             01A594
timewrt0            01A59A
.loop$veba          01A5A0
.jump2$veba         01A5A4
.jump3$veba         01A5AC
.jump4$veba         01A5B6
bonuswrt            01A5EC
.loop$weba          01A5F8
.jump2$weba         01A5FC
.jump3$weba         01A604
.jump4$weba         01A60E
.jump5$weba         01A638
.jump7$weba         01A63E
.loop2$weba         01A640
playsuuwrt          01A64C
.loop$xeba          01A664
.jump2$xeba         01A66C
.jump3$xeba         01A674
.jump4$xeba         01A67E
.jump5$xeba         01A682
.jump6$xeba         01A698
.jump7$xeba         01A6A4
.loop2$xeba         01A6AA
scorewrtcg          01A6B6
playsuucg           01A9B6
edit                01AB00
edit_move_tbl       01AB0E
editinit            01AB12
.jump0$ydba         01AB58
.jump1$ydba         01AB5E
.jump$ydba          01AB78
editmove            01AB88
.jump$zdba          01AB98
editwalk            01ABB0
.jump$aeba          01ABDA
.jump0$aeba         01ABF2
.jump1$aeba         01ABF6
.jump2$aeba         01AC16
.jump3$aeba         01AC2C
.jump4$aeba         01AC38
.jump5$aeba         01AC40
.lend$aeba          01AC48
.jump77$aeba        01AC64
.jump6$aeba         01AC7C
.jump7$aeba         01AC80
.worknai$aeba       01ACC4
.jump8$aeba         01ACC4
.end$aeba           01ACEC
.jump9$aeba         01AD1E
editpatchg          01AD20
edittbl             01AD40
edit1tbl            01AD4E
edit2tbl            01ADC0
edit3tbl            01ADC0
edit4tbl            01ADFA
edit5tbl            01AED4
edit6tbl            01AED4
edit7tbl            01AED4
mapinittbl          01AF58
divdevtbl           01AFC8
ddev00              01B008
ddev01              01B028
ddev02              01B03C
ddev03              01B044
ddev04              01B04C
ddev05              01B084
ddev06              01B08C
ddev08              01B08C
ddev14              01B08C
ddev10              01B0AC
ddev11              01B0E4
ddev12              01B0F8
ddev13              01B12A
ddev07              01B15C
ddev09              01B15C
ddev15              01B15C
ddev16              01B170
ddev17              01B178
ddev18              01B1B0
ddev19              01B1C4
ddev20              01B1C4
ddev21              01B1C6
ddev22              01B1D4
ddev23              01B1E2
ddev24              01B1F0
ddev25              01B1FE
ddev26              01B20C
ddev27              01B21A
ddev28              01B21C
ddev29              01B21E
ddev30              01B220
ddev31              01B222
scddirtbl1          020000
scddirtbl2          020100
scdtbl              020200
scdtbl1             020200
scdtbl2             021200
scdtbl3             022200
scdtbl4             023200
zone1scd            024200
zone1scdb           02439A
zone4scd            024534
zone4scdb           024834
zone6scd            024B34
zone3scd            024B34
zone2scd            024B34
zone6scdb           024E34
zone3scdb           024E34
zone2scdb           024E34
zone5scd            025134
zone5scdb           025434
rotmaptbl0          025734
rotmaptbl1          0259AE
rotmaptbl2          025DC0
rotmaptbl3          02611C
rotmaptbl4          0265F6
rotmaptbl5          026AA6
efect00acg          026D98
efect00bcg          026E18
efect00ccg          026E98
efect00dcg          026F18
efect00ecg          026F98
efect08acg          027098
efect08bcg          027498
efect0dacg          027798
efect0dbcg          027898
efect0dccg          027B98
efect0ddcg          027C58
efect0decg          027D18
efect0dfcg          027DD8
efect0dgcg          027F58
efect0dhcg          028198
zonemaptbl          028218
zone1_1a            0282C0
zone1_2a            0283B2
zone1_3a            02847A
zone1_3b            02859C
zone1_2b            02859C
zone1_1b            02859C
zone4_1a            0285BE
zone4_2a            028DC0
zone4_3a            0295C2
zone4_4a            029DC4
zone4_4b            02A5C6
zone4_3b            02A5C6
zone4_2b            02A5C6
zone4_1b            02A5C6
zone7_4a            02A5D0
zone6_4a            02A5D0
zone3_4a            02A5D0
zone2_4a            02A5D0
zone1_4a            02A5D0
zone7_3a            02A5D0
zone6_3a            02A5D0
zone3_3a            02A5D0
zone2_3a            02A5D0
zone7_2a            02A5D0
zone6_2a            02A5D0
zone3_2a            02A5D0
zone2_2a            02A5D0
zone7_1a            02A5D0
zone6_1a            02A5D0
zone3_1a            02A5D0
zone2_1a            02A5D0
zone5_4a            02ADD2
zone5_3a            02ADD2
zone5_2a            02ADD2
zone5_1a            02ADD2
zone7_4b            02B5D4
zone6_4b            02B5D4
zone3_4b            02B5D4
zone2_4b            02B5D4
zone1_4b            02B5D4
zone7_3b            02B5D4
zone6_3b            02B5D4
zone3_3b            02B5D4
zone2_3b            02B5D4
zone7_2b            02B5D4
zone6_2b            02B5D4
zone3_2b            02B5D4
zone2_2b            02B5D4
zone7_1b            02B5D4
zone6_1b            02B5D4
zone3_1b            02B5D4
zone2_1b            02B5D4
zone5_4b            02B666
zone5_3b            02B666
zone5_2b            02B666
zone5_1b            02B666
zone7_4z            02B6B0
zone6_4z            02B6B0
zone5_4z            02B6B0
zone4_4z            02B6B0
zone3_4z            02B6B0
zone2_4z            02B6B0
zone1_4z            02B6B0
zone7_3z            02B6B0
zone6_3z            02B6B0
zone5_3z            02B6B0
zone4_3z            02B6B0
zone3_3z            02B6B0
zone2_3z            02B6B0
zone1_3z            02B6B0
zone7_2z            02B6B0
zone6_2z            02B6B0
zone5_2z            02B6B0
zone4_2z            02B6B0
zone3_2z            02B6B0
zone2_2z            02B6B0
zone1_2z            02B6B0
zone7_1z            02B6B0
zone6_1z            02B6B0
zone5_1z            02B6B0
zone4_1z            02B6B0
zone3_1z            02B6B0
zone2_1z            02B6B0
zone1_1z            02B6B0
bigringcg           02B6B4
asettbl             040000
asettbl10           040096
asettbl11           0403A8
asettbl12           040798
asettbl20           040C8A
asettbl21           040C90
asettbl23           040C96
asettbl22           040C96
kassya10            040C9C
kassya11            040CCE
kassya20            040D00
kassya21            040D32
kassya30            040D64
kassya31            040DAE
asettbl30           040DEC
asettbl31           040E5E
asettbl32           040E64
asettbl40           040E6A
asettbl41           041080
asettbl42           0412AE
asettbl50           0412B4
asettbl51           0413BC
asettbl52           0413C2
asettbl60           0413C8
asettbl61           0413CE
asettbl62           0413D4
beltc10             0413E6
beltc11             041418
beltc12             04144A
beltc13             04147C
beltc14             0414AE
beltc15             0414E0
asettbl70           041518
asettbl70z          041674
asettbl60z          041674
asettbl10z          041674
asettbl50z          041674
asettbl40z          041674
asettbl30z          041674
asettbl20z          041674
ringacttbl          050000
ringact11           050030
ringact12           05017A
ringact13           0502A4
ringact21           0503CE
ringact22           05045C
ringact23           0504BA
ringact80           050538
ringact00           0506AA
ringact01           05080C
ringact02           05099A
ringact03           05099C
sound               071B4C
pcm_top             072E7C
pcm_end             0745DC
playcg              080000
playpat             0914C0
ply000              09160E
ply001              091610
ply002              091632
ply003              091644
ply004              09166E
ply005              091698
ply006              0916C2
ply007              0916E4
ply008              091706
ply009              091718
ply010              09172A
ply011              09173C
ply012              09175E
ply013              091780
ply014              091792
ply015              0917A4
ply016              0917BE
ply017              0917D8
ply018              0917F2
ply019              091814
ply020              091836
ply021              091850
ply022              09186A
ply023              091884
ply024              09189E
ply025              0918C0
ply026              0918EA
ply027              091914
ply028              091936
ply029              091958
ply030              09197A
ply031              09199C
ply032              0919BE
ply033              0919E8
ply034              091A0A
ply035              091A2C
ply036              091A4E
ply037              091A68
ply038              091A7A
ply039              091A8C
ply040              091A9E
ply041              091AB8
ply042              091AD2
ply043              091AEC
ply044              091AFE
ply045              091B10
ply046              091B22
ply047              091B34
ply048              091B4E
ply049              091B70
ply050              091B92
ply051              091BBC
ply052              091BDE
ply053              091C00
ply054              091C22
ply055              091C44
ply056              091C66
ply057              091C88
ply058              091CAA
ply059              091CCC
ply060              091CEE
ply061              091D00
ply062              091D12
ply063              091D24
ply064              091D36
ply065              091D48
ply066              091D5A
ply067              091D6C
ply068              091D7E
ply069              091D90
ply070              091DA2
ply071              091DB4
ply072              091DC6
ply073              091DD8
ply074              091DEA
ply075              091DFC
ply076              091E0E
ply077              091E20
ply078              091E32
ply079              091E44
ply080              091E56
ply081              091E68
ply082              091E7A
ply083              091E8C
ply084              091E9E
ply085              091EB0
ply086              091EC2
ply087              091ED4
ply088              091EE6
ply089              091EF8
ply090              091F0A
ply091              091F1C
ply092              091F2E
ply093              091F40
ply094              091F52
ply095              091F64
ply096              091F76
ply097              091F88
ply098              091F9A
ply099              091FAC
ply100              091FBE
ply101              091FD0
ply102              091FE2
ply103              091FF4
ply104              092006
ply105              092018
ply106              09202A
ply107              09203C
ply108              09204E
ply109              092058
ply110              092062
ply111              09206C
ply112              092076
ply113              092080
ply114              09208A
ply115              092094
ply116              09209E
ply117              0920A8
ply118              0920B2
ply119              0920BC
ply120              0920D6
ply121              0920F0
ply122              09210A
ply123              092124
ply124              092146
ply125              092168
ply126              09218A
ply127              0921A4
ply128              0921AE
ply129              0921B8
ply130              0921D2
ply131              0921EC
ply132              092206
ply133              092220
ply134              092232
ply135              092244
ply136              092256
ply137              092268
ply138              09228A
ply139              09229C
ply140              0922B6
ply141              0922D0
ply142              0922E2
ply143              0922F4
ply144              092306
ply145              092318
ply146              09233A
ply147              09235C
ply148              09237E
ply149              092398
ply150              0923B2
ply151              0923D4
ply152              0923EE
ply153              092410
ply154              092432
ply155              09244C
ply156              092466
ply157              092480
ply158              092492
ply159              09249C
ply160              0924AE
ply161              0924C8
ply162              0924E2
ply163              0924FC
ply164              09250E
ply165              092520
ply166              09253A
foxcg               09254C
playwrtpat          09DA4C
plwpat              09DA4C
plw000              09DB9A
plw001              09DB9C
plw002              09DBA6
plw003              09DBAC
plw004              09DBB8
plw005              09DBC4
plw006              09DBD0
plw007              09DBDA
plw008              09DBE4
plw009              09DBEA
plw010              09DBF0
plw011              09DBF6
plw012              09DC00
plw013              09DC0A
plw014              09DC10
plw015              09DC16
plw016              09DC1E
plw017              09DC26
plw018              09DC2E
plw019              09DC38
plw020              09DC42
plw021              09DC4A
plw022              09DC52
plw023              09DC5A
plw024              09DC62
plw025              09DC6C
plw026              09DC78
plw027              09DC84
plw028              09DC8E
plw029              09DC98
plw030              09DCA2
plw031              09DCAC
plw032              09DCB6
plw033              09DCC2
plw034              09DCCC
plw035              09DCD6
plw036              09DCE0
plw037              09DCE8
plw038              09DCEE
plw039              09DCF4
plw040              09DCFA
plw041              09DD02
plw042              09DD0A
plw043              09DD12
plw044              09DD18
plw045              09DD1E
plw046              09DD24
plw047              09DD2A
plw048              09DD32
plw049              09DD3C
plw050              09DD46
plw051              09DD52
plw052              09DD5C
plw053              09DD66
plw054              09DD70
plw055              09DD7A
plw056              09DD84
plw057              09DD8E
plw058              09DD98
plw059              09DDA2
plw068              09DDAC
plw064              09DDAC
plw060              09DDAC
plw069              09DDB2
plw065              09DDB2
plw061              09DDB2
plw070              09DDB8
plw066              09DDB8
plw062              09DDB8
plw071              09DDBE
plw067              09DDBE
plw063              09DDBE
plw080              09DDC4
plw076              09DDC4
plw072              09DDC4
plw081              09DDCA
plw077              09DDCA
plw073              09DDCA
plw082              09DDD0
plw078              09DDD0
plw074              09DDD0
plw083              09DDD6
plw079              09DDD6
plw075              09DDD6
plw092              09DDDC
plw088              09DDDC
plw084              09DDDC
plw093              09DDE2
plw089              09DDE2
plw085              09DDE2
plw094              09DDE8
plw090              09DDE8
plw086              09DDE8
plw095              09DDEE
plw091              09DDEE
plw087              09DDEE
plw104              09DDF4
plw100              09DDF4
plw096              09DDF4
plw105              09DDFA
plw101              09DDFA
plw097              09DDFA
plw106              09DE00
plw102              09DE00
plw098              09DE00
plw107              09DE06
plw103              09DE06
plw099              09DE06
plw108              09DE0C
plw109              09DE10
plw110              09DE14
plw111              09DE18
plw112              09DE1C
plw113              09DE20
plw114              09DE24
plw115              09DE28
plw116              09DE2C
plw117              09DE30
plw118              09DE34
plw119              09DE38
plw120              09DE40
plw121              09DE48
plw122              09DE50
plw123              09DE58
plw124              09DE62
plw125              09DE6C
plw126              09DE76
plw127              09DE7E
plw128              09DE82
plw129              09DE86
plw130              09DE8E
plw131              09DE96
plw132              09DE9E
plw133              09DEA6
plw134              09DEAC
plw135              09DEB2
plw136              09DEB8
plw137              09DEBE
plw138              09DEC8
plw139              09DECE
plw140              09DED6
plw141              09DEDE
plw142              09DEE4
plw143              09DEEA
plw144              09DEF0
plw147              09DEF6
plw145              09DEF6
plw146              09DF00
plw149              09DF06
plw148              09DF06
plw150              09DF0E
plw151              09DF18
plw152              09DF20
plw153              09DF2A
plw154              09DF34
plw155              09DF3C
plw156              09DF44
plw157              09DF4C
plw158              09DF52
plw159              09DF56
plw160              09DF5C
plw161              09DF64
plw162              09DF6C
plw163              09DF74
plw164              09DF7A
plw165              09DF80
plw166              09DF88
bariacg             09DF8E
mutekicg            09E114
stopfxcg            09E1FC
spinsfxcg           09E3FC
exit2cg             09ED3C
foxpat              09FB3C
foxsp000            09FC46
foxsp001            09FC48
foxsp002            09FC5A
foxsp003            09FC6C
foxsp004            09FC7E
foxsp005            09FC90
foxsp006            09FC9A
foxsp007            09FCA4
foxsp008            09FCB6
foxsp009            09FCC8
foxsp010            09FCD2
foxsp011            09FCDC
foxsp012            09FCE6
foxsp013            09FCF0
foxsp014            09FCFA
foxsp015            09FD14
foxsp016            09FD2E
foxsp017            09FD48
foxsp018            09FD62
foxsp019            09FD7C
foxsp020            09FD96
foxsp021            09FDB0
foxsp022            09FDCA
foxsp023            09FDE4
foxsp024            09FDFE
foxsp025            09FE18
foxsp026            09FE32
foxsp027            09FE4C
foxsp028            09FE66
foxsp029            09FE80
foxsp030            09FE9A
foxsp031            09FEB4
foxsp032            09FECE
foxsp033            09FEE8
foxsp034            09FF02
foxsp035            09FF1C
foxsp036            09FF36
foxsp037            09FF50
foxsp038            09FF6A
foxsp039            09FF7C
foxsp040            09FF96
foxsp041            09FFA8
foxsp042            09FFC2
foxsp043            09FFD4
foxsp044            09FFEE
foxsp045            0A0000
foxsp046            0A001A
foxsp047            0A002C
foxsp048            0A003E
foxsp049            0A0050
foxsp050            0A0062
foxsp051            0A0074
foxsp052            0A0086
foxsp053            0A00A0
foxsp054            0A00BA
foxsp055            0A00D4
foxsp056            0A00EE
foxsp057            0A0108
foxsp058            0A0122
foxsp061            0A013C
foxsp059            0A013C
foxsp060            0A0156
foxsp062            0A0170
foxsp063            0A018A
foxsp064            0A01A4
foxsp065            0A01BE
foxsp066            0A01D8
foxsp067            0A01F2
foxsp068            0A020C
foxsp069            0A0226
foxsp070            0A0240
foxsp071            0A024A
foxsp072            0A0254
foxsp073            0A025E
foxsp074            0A0268
foxsp075            0A0272
foxsp076            0A027C
foxsp077            0A0286
foxsp078            0A0290
foxsp079            0A029A
foxsp080            0A02A4
foxsp081            0A02AE
foxsp082            0A02B8
foxsp083            0A02C2
foxsp084            0A02CC
foxsp085            0A02D6
foxsp086            0A02E0
foxsp087            0A02EA
foxsp088            0A02F4
foxsp089            0A02FE
foxsp090            0A0310
foxsp091            0A0322
foxsp092            0A032C
foxsp093            0A0336
foxsp094            0A0340
foxsp095            0A0352
foxsp096            0A0364
foxsp097            0A036E
foxsp098            0A0378
foxsp099            0A0382
foxsp100            0A0394
foxsp101            0A03A6
foxsp102            0A03B8
foxsp103            0A03CA
foxsp104            0A03DC
foxsp105            0A03EE
foxsp106            0A0400
foxsp107            0A0412
foxsp108            0A041C
foxsp109            0A042E
foxsp110            0A0440
foxsp111            0A0452
foxsp112            0A0464
foxsp113            0A0476
foxsp114            0A0488
foxsp115            0A049A
foxsp116            0A04AC
foxsp117            0A04B6
foxsp118            0A04C0
foxsp119            0A04D2
foxsp120            0A04DC
foxsp121            0A04E6
foxsp122            0A04F0
foxsp123            0A04FA
foxsp124            0A0504
foxsp125            0A050E
foxsp126            0A0518
foxsp127            0A0522
foxsp128            0A0534
foxsp129            0A0546
foxsp130            0A0550
foxsp131            0A055A
foxsp132            0A0564
foxwrtpat           0A056E
foxw000             0A0678
foxw001             0A067A
foxw002             0A0680
foxw003             0A0686
foxw004             0A068C
foxw005             0A0692
foxw006             0A0696
foxw007             0A069A
foxw008             0A06A0
foxw009             0A06A6
foxw010             0A06AA
foxw011             0A06AE
foxw012             0A06B2
foxw013             0A06B6
foxw014             0A06BA
foxw015             0A06C2
foxw016             0A06CA
foxw017             0A06D2
foxw018             0A06DA
foxw019             0A06E2
foxw020             0A06EA
foxw021             0A06F2
foxw022             0A06FA
foxw023             0A0702
foxw024             0A070A
foxw025             0A0712
foxw026             0A071A
foxw027             0A0722
foxw028             0A072A
foxw029             0A0732
foxw030             0A073A
foxw031             0A0742
foxw032             0A074A
foxw033             0A0752
foxw034             0A075A
foxw035             0A0762
foxw036             0A076A
foxw037             0A0772
foxw038             0A077A
foxw039             0A0780
foxw040             0A0788
foxw041             0A078E
foxw042             0A0796
foxw043             0A079C
foxw044             0A07A4
foxw045             0A07AA
foxw046             0A07B2
foxw047             0A07B8
foxw048             0A07BE
foxw050             0A07C4
foxw051             0A07CA
foxw052             0A07D0
foxw053             0A07D8
foxw054             0A07E0
foxw055             0A07E8
foxw056             0A07F0
foxw057             0A07F8
foxw058             0A0800
foxw061             0A0808
foxw059             0A0808
foxw060             0A0810
foxw062             0A0818
foxw063             0A0820
foxw064             0A0828
foxw065             0A0830
foxw066             0A0838
foxw067             0A0840
foxw068             0A0848
foxw069             0A0850
foxw070             0A0858
foxw071             0A085C
foxw072             0A0860
foxw129             0A0864
foxw073             0A0864
foxw130             0A0868
foxw074             0A0868
foxw131             0A086C
foxw075             0A086C
foxw132             0A0870
foxw076             0A0870
foxw077             0A0874
foxw078             0A0878
foxw079             0A087C
foxw080             0A0880
foxw081             0A0884
foxw082             0A0888
foxw083             0A088C
foxw084             0A0890
foxw085             0A0894
foxw086             0A0898
foxw087             0A089C
foxw088             0A08A0
foxw089             0A08A4
foxw090             0A08AA
foxw091             0A08B0
foxw092             0A08B4
foxw093             0A08B8
foxw095             0A08BC
foxw094             0A08BC
foxw096             0A08C2
foxw097             0A08C6
foxw098             0A08CA
foxw099             0A08CE
foxw100             0A08D4
foxw101             0A08DA
foxw102             0A08E0
foxw103             0A08E6
foxw104             0A08EC
foxw105             0A08F2
foxw106             0A08F8
foxw107             0A08FE
foxw108             0A0902
foxw109             0A0908
foxw112             0A090E
foxw110             0A090E
foxw111             0A0914
foxw114             0A091A
foxw113             0A091A
foxw115             0A0920
foxw116             0A0926
foxw117             0A092A
foxw118             0A092E
foxw119             0A0934
foxw120             0A0938
foxw121             0A093C
foxw122             0A0940
foxw123             0A0944
foxw124             0A0948
foxw125             0A094C
foxw126             0A0950
foxw127             0A0954
foxw128             0A095A
logocg              0A0960
logomap             0A0DD0
titleamap           0A0ECC
titlebmap           0A1024
titlecg             0A12FC
titlespcg           0A2CA6
greencg             0A37EA
burankocg           0A3834
hashicg             0A394E
movecg              0A3A3A
tamacg              0A3A82
togehcg             0A3C20
togehcg2            0A3E34
jyamacg             0A3F60
brkabecg            0A408E
kagebcg             0A412C
fire00cg            0A418C
moekasucg           0A42C4
taki00cg            0A43D2
fball00cg           0A44D8
hashi00cg           0A4626
cablecarcg          0A46FE
door00cg            0A49F2
cso00cg             0A4A6A
brig08cg            0A4C02
falls08cg           0A4D7A
gem08cg             0A50DC
pltfrm08cg          0A534E
frntlite08cg        0A540E
cork08cg            0A564A
kemuri0dcg          0A57E4
dai0dcg             0A5904
nami0dcg            0A5BF0
swichcg             0A5D60
banevcg             0A5E38
banehcg             0A5F54
bane45cg            0A601E
scorecg             0A61F2
playnocg            0A62FA
ringcg              0A6410
itemcg              0A6504
togecg              0A692E
tencg               0A697E
savecg              0A6A58
gatorcg             0A6AFE
waspcg              0A6EA0
bbatcg              0A7086
octcg               0A73DC
stegocg             0A76FC
redzcg              0A7AF8
billfishcg          0A7ECE
seahorsecg          0A83C6
bballcg             0A8814
mamabubcg           0A8AAA
bubblercg           0A8CD6
snailcg             0A8EF8
sandcrabcg          0A90F4
bfishcg             0A9476
bossbacg            0A9682
zdbcg               0A9DBE
bossbmcg            0AA31C
bossafbcg           0AA9A4
bosssmcg            0AAA22
boss00cg            0AAB08
bosshcg             0AB2F4
butacg              0AB3E8
kanicg              0AB7A8
hachicg             0ABC96
bakuhacg            0AC03C
moguracg            0AC224
fishcg              0AC90E
fish2cg             0ACB76
arumacg             0ACE00
musicg              0AD324
kamerecg            0AD5AE
yadocg              0ADBCC
batcg               0ADFB4
usacg               0AE2B0
brobocg             0AE4F8
unicg               0AE790
imocg               0AE96E
zonecg              0AEAFC
yararecg            0AF10A
overcg              0AF770
jumpcg              0AF902
jump2cg             0AFA04
golecg              0AFAE0
ebigringcg          0AFF5C
btencg              0B00D0
contcg              0B03D2
sdsoniccg           0B0682
usagicg             0B08BC
niwacg              0B0A14
pengcg              0B0B70
azarcg              0B0CEC
fbutacg             0B0E08
fliccg              0B0F3E
risucg              0B1078
zone00blk           0B11D4
zone00cg            0B2174
zone00map           0B4FAC
zone08blk           0BCFAC
zone08cg            0BE58C
zone08pccg          0C129A
zone08map           0C140E
zone0dblk           0C940E
zone0dcg            0CA3AE
zone0dpccg          0CCD56
zone0dmap           0CCFB2
zone1blk            0D4FB2
zone1cg             0D5DB2
enkeicg             0D936E
zone1map            0DA9CE
scdtblwk            FE0000
scdtblwk2           FE2000
scddirtbl           FE4000

For those curious, these are the new symbols that I extracted. I do recall seeing a few of these being discussed on various pages, but I don't think I've seen it properly documented, so here you go:

Code:

bossvac             000000 (dummied out)
vacumeguy           000000 (dummied out)
explode             000000 (dummied out)
burankoposiset      007D6A
burankoposiset2     007DAE
burankopat          007EAE
buranko0dpat        007EDA
ballpat             007F4A
shimapat2           0084AE
fishpat             00B11E
speedset            00C706
frameoutchk         00C7AE
frameoutchkd        00C81A
dualmodesub         00CFC2
dualmodesub2        00CFDE
ringcolchk          00D2F0
kamerepat           00E4A8
musipat             00EA80
ridechksub_t        00EEC0
jumpcolsub          00FDCC
emycol_d            0128C6
zone1scd            024200
zone1scdb           02439A
zone4scd            024534
zone4scdb           024834
zone6scd            024B34
zone3scd            024B34
zone2scd            024B34
zone6scdb           024E34
zone3scdb           024E34
zone2scdb           024E34
zone5scd            025134
zone5scdb           025434
efect08acg          027098
zone1_1a            0282C0
zone1_2a            0283B2
zone1_3a            02847A
zone1_3b            02859C
zone1_2b            02859C
zone1_1b            02859C
zone4_1a            0285BE
zone4_2a            028DC0
zone4_3a            0295C2
zone4_3b            02A5C6
zone4_2b            02A5C6
zone4_1b            02A5C6
zone7_3a            02A5D0
zone6_3a            02A5D0
zone3_3a            02A5D0
zone2_3a            02A5D0
zone7_2a            02A5D0
zone6_2a            02A5D0
zone3_2a            02A5D0
zone2_2a            02A5D0
zone7_1a            02A5D0
zone6_1a            02A5D0
zone3_1a            02A5D0
zone2_1a            02A5D0
zone5_3a            02ADD2
zone5_2a            02ADD2
zone5_1a            02ADD2
zone7_3b            02B5D4
zone6_3b            02B5D4
zone3_3b            02B5D4
zone2_3b            02B5D4
zone7_2b            02B5D4
zone6_2b            02B5D4
zone3_2b            02B5D4
zone2_2b            02B5D4
zone7_1b            02B5D4
zone6_1b            02B5D4
zone3_1b            02B5D4
zone2_1b            02B5D4
zone5_3b            02B666
zone5_2b            02B666
zone5_1b            02B666
zone7_2z            02B6B0
zone6_2z            02B6B0
zone5_2z            02B6B0
zone4_2z            02B6B0
zone3_2z            02B6B0
zone2_2z            02B6B0
zone1_2z            02B6B0
zone7_1z            02B6B0
zone6_1z            02B6B0
zone5_1z            02B6B0
zone4_1z            02B6B0
zone3_1z            02B6B0
zone2_1z            02B6B0
zone1_1z            02B6B0
kassya10            040C9C
kassya11            040CCE
kassya20            040D00
kassya21            040D32
kassya30            040D64
kassya31            040DAE
beltc10             0413E6
beltc11             041418
beltc12             04144A
beltc13             04147C
beltc14             0414AE
beltc15             0414E0
asettbl50z          041674
asettbl40z          041674
asettbl30z          041674
sound               071B4C
playcg              080000
plwpat              09DA4C
spinsfxcg           09E3FC
foxsp127            0A0522
foxwrtpat           0A056E
foxw000             0A0678
foxw001             0A067A
foxw002             0A0680
foxw003             0A0686
foxw004             0A068C
foxw005             0A0692
foxw006             0A0696
foxw007             0A069A
foxw008             0A06A0
foxw009             0A06A6
foxw010             0A06AA
foxw011             0A06AE
foxw012             0A06B2
foxw013             0A06B6
foxw014             0A06BA
foxw015             0A06C2
foxw016             0A06CA
foxw017             0A06D2
foxw018             0A06DA
foxw019             0A06E2
foxw020             0A06EA
foxw021             0A06F2
foxw022             0A06FA
foxw023             0A0702
foxw024             0A070A
foxw025             0A0712
foxw026             0A071A
foxw027             0A0722
foxw028             0A072A
foxw029             0A0732
foxw030             0A073A
foxw031             0A0742
foxw032             0A074A
foxw033             0A0752
foxw034             0A075A
foxw035             0A0762
foxw036             0A076A
foxw037             0A0772
foxw038             0A077A
foxw039             0A0780
foxw040             0A0788
foxw041             0A078E
foxw042             0A0796
foxw043             0A079C
foxw044             0A07A4
foxw045             0A07AA
foxw046             0A07B2
foxw047             0A07B8
foxw048             0A07BE
logomap             0A0DD0
titleamap           0A0ECC
titlebmap           0A1024
titlecg             0A12FC
tamacg              0A3A82
togehcg2            0A3E34
moekasucg           0A42C4
fball00cg           0A44D8
cablecarcg          0A46FE
octcg               0A73DC
seahorsecg          0A83C6
butacg              0AB3E8
kanicg              0AB7A8
hachicg             0ABC96
bakuhacg            0AC03C
fish2cg             0ACB76
yadocg              0ADBCC
batcg               0ADFB4
brobocg             0AE4F8
zone00blk           0B11D4
zone08blk           0BCFAC
zone08pccg          0C129A
zone0dblk           0C940E
zone0dcg            0CA3AE
zone1blk            0D4FB2
scdtblwk            FE0000
scddirtbl           FE4000

Devon · Jan 7, 2025

So, I managed to track a couple more labels from the Sonic CD Gems Collection decompilation, related to stage data.

Sonic CD calls the pointer to chunk data "pmapwk", and calls the buffer for block data "blockwk". This actually checks out with the Sonic 2 labels. For example, Emerald Hill's blocks are called "zone00blk" and its chunks are called "zone00map". I do think it's possible that the "p" in "pmapwk" stands for "pointer" in Sonic CD, since the palette buffer is called "lpcolorwk", and the horizontal scroll buffer is called "lphscrollbuff", and they all point to memory located outside of the core game code:
Code:
  pmapwk = (unsigned short*)**pBufTbl++;
  lpcolorwk = (PALETTEENTRY*)**pBufTbl++;
  lpcolorwk2 = (PALETTEENTRY*)**pBufTbl++;
  lpcolorwk3 = (PALETTEENTRY*)**pBufTbl++;
  lpcolorwk4 = (PALETTEENTRY*)**pBufTbl++;
  lphscrollbuff = (int_union*)**pBufTbl++;
Confusingly, Sonic CD also refers to the foreground layout buffer as "mapwka", and the background layout buffer as "mapwkb". In Sonic 2, the labels for the actual data in ROM are just "zoneZ_AL", with "Z" being the zone number (GHZ = "1"), "A" being the act number (act 1 = "1"), and "L" being the layer type ("a" = foreground, "b" = background). GHZ1's foreground data is called "zone1_1a", for example. The index table for these layouts is called "zonemaptbl".

Personally, I think the chunk buffer is called "mapwk", with "mapwka" and "mapwkb" referring to the layouts, considering they are arrays of chunk IDs. I don't think it's unheard of, honestly, because there's "waterflag", the flag for when the water palette takes up the entire screen, and then "water_flag", the water events routine ID.

Devon · Apr 26, 2025

Devon said: ↑

metpat = ????????? (prototype leftover maybe?)
Click to expand...

I have a hunch on what this could be. In Sonic 2 Nick Arcade, a good chunk of the special stage graphics were removed, including the sprite data for the walls, because they were grouped with the graphics data in Sonic 1. However, the sprite table for the special stage still includes the entries for the walls, except they all point to where "goalpat" and co. are instead. So, I think "metpat" refers to the walls, with the data removed, and its label moved in with the rest of the block sprites.

Also...

I present, an extraction of scraps of earlier code from the Sonic 2 Nick Arcade prototype ROM, including linker work data, with disassemblies, using official symbol names where possible.

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