Basic Questions and Answers Thread

Yeah, i know that I deleted the last post I did in this thread, but now i'm going to make a question about something else.

I'm trying to port the respawn feature from the sonic 1 prototype ( ). I know that 2 lines makes the code not work, but idk which. This is the code I have:

Code:

ReAppear:
        move.b    (v_jpadpress2).w,d0
        andi.b    #btnABC,d0
        beq.s    ReAppr_End
        andi.b    #btnA,d0
        bne.s    ReAppr_End
        move.b    #id_Walk,obAnim(a0)        ; Respawns you after a death
        subq.b    #4,obRoutine(a0)    ; The lines above seem to make the code do nothing
        move.w    $38(a0),obY(a0)
        move.w    #120,flashtime(a0)    ; set sonic to be invulnerable for 2 seconds

ReAppr_End:
        rts

If someone founds something else just tell me
(Also, the Sonic 1 Beta disassembly is cortesy of Filter)

 

88 in pure decimal equates to 58 in hex, which unless you have extended music slots it won’t work this way.

I know this is already old at this point, but still.

 

Yes, that is more or less what I said.

 

Where are the Z80 Banks locations from Knuckles Chaotix'? I may be stupid, but where are they exactly?

 

Try looking here.

 

But the location i am looking for is Midnight Greenhouse.

 

Look harder, it's the 5th entry in the list there.

 

How do i can loop a MIDI with "Sekaiju"?

 

How do i fix a black screen after adding the Sonic 2 Clone Driver into a clean dissasembly? i already tried to find some answers, but sadly none.

 

Yeah, when I took a look at it, I have noticed.. yeah, I forgot about that, since I think GitHub's version didn't have the $, thanks for pointing it out

 

So ever since I made the speed issues fixes in a Sonic 2 hack I'm doing, I got a black screen when I got to check it, then, after applying the Super Sonic bugs fixes, I've got an graphics bug issue that I've never noticed until I made the 14 continues bug fix (AKA the bug where the Oil Ocean Zone theme plays forever), the continue screen is fine when a continue is gotten, but getting two or more continues breaks the continue screen, leading to this:

Does anyone know how I can fix the continue screen and make it not look like this? I tried to look for some information about this, but unfortunately, none. Here's my current asm file, since I'm not sure what's causing the graphics bug issue
https://mega.nz/file/WHhgQBTY#25WoMA8df9YADriefwDMOpcDBjtHzmvMJJ9lWbaPevY

 

That's a bug in the Xenowhirl disassembly. Multiple parts of Sonic 2 were disassembled incorrectly, causing the game to break when you edit it. I know that there's also an object somewhere whose data was accidentally turned into code, but I can't remember which. That disassembly's 16 years old, so I recommend using something newer, like the Git disassembly.

 

Interestingly enough to me, I’ve used the 2007 Xenowhirl disassembly for Sonic 2 hacking for a while when I started hacking Sonic 2 up until I switched over to the GitHub disassembly as early as 2018 from what I remember because it’s more up to date. The main reason for that change was because of the music and sound pointers, which were hardcoded in the Xenowhirl disassembly but have changed to constants in the GitHub disassembly. Other than that, the GitHub disassembly is my main disassembly for Sonic 2 hacking.

 

Specific parts like the speed codes and the Super Sonic code in my case? Now that you say it, it now gets me thinking that the Xenowhirl disassembly is obsolete, I think that must be the main reason why the game itself breaks if specific code is edited, even if it's just for a bug fix. Well, time to move to the GitHub disassembly, I have no choice but to use it, since I don't want the graphics bug to happen

 

I need help to optimize the code for the invincibility music after breaking a Super monitor without the powerup in Sonic 3 & Knuckles to fix a bug where the invincibility music doesn't play at all if a Super monitor is broken and the player doesn't have invincibility.

Code:

Sonic 3
Monitor_Give_SuperSonic:
        addq.w    #1,(a2)
        addi.w    #50,(Ring_count).w
        move.b    #1,(Super_palette_status).w
        move.b    #$F,(Palette_timer).w
        move.b    #1,(Super_Sonic_Knux_flag).w
        move.w    #60,(Super_frame_count).w
        move.l    #Map_SuperSonic,(Player_1+mappings).w
        move.b    #$81,(Player_1+object_control).w
        move.b    #$1F,(Player_1+anim).w
        move.l    #Obj_SuperSonic_Stars,(Super_stars).w
        move.w    #$A00,(Max_speed).w
        move.w    #$30,(Acceleration).w
        move.w    #$100,(Deceleration).w
        move.b    #0,(Player_1+invincibility_timer).w
        bset    #1,$2B(a1)
        moveq    #signextendB(sfx_Whistle),d0
        jsr    (Play_SFX).l
        btst    #1,$2B(a1)    ;  <-
        bne.s    locret_1B8DF    ;  <-
        moveq    #signextendB(mus_Invincibility),d0
        jmp    (Play_Music).l
; ---------------------------------------------------------------------------
locret_1B8DF:
        rts

Code:

Sonic & Knuckles/Sonic 3 & Knuckles
    .continued:
        move.b    #$81,(Player_1+object_control).w
        move.b    #0,(Player_1+invincibility_timer).w
        bset    #Status_Invincible,status_secondary(a1)
        moveq    #signextendB(sfx_SuperTransform),d0
        jsr    (Play_SFX).l
        btst    #1,$2B(a1)    ; Is invincility music already playing? <-
        bne.s    locret_1DB25    ; Resume music instead of restarting it if it's already playing <-
        moveq    #signextendB(mus_Invincibility),d0        ; play invincibility theme
        jmp    (Play_Music).l
; ---------------------------------------------------------------------------
locret_1DB25:
        rts

I know that this is by the pointed lines that I added, but I am not sure how I'm supposed to program it to play if the monitor is broken without the invincibility, or skip the play commands if the music is playing already
(Using the bne just makes the BGM there resume instead of playing the invincibility music)
EDIT: Nevermind, forget it, I already saw the issue, since I already noticed what was going on here

 

I wonder if it's possible to make hack go right to the level, skipping SEGA/title screens. Specifically on S1 Hivebrain (2005) disassembly.

EDIT: Friend helped me to find a solution

 

It's as easy as setting game mode to level from the very start.

Locate this line before the "MainGameLoop:"

Code:

        move.b  #0,($FFFFF600).w ; set Game Mode to Sega Screen

MainGameLoop:

and replace with:

Code:

        move.b  #$C,($FFFFF600).w ; set Game Mode to Level

MainGameLoop:

Now boot up your game... and realize the screen is completely empty, even though the game is playable. This is because "Level" game mode doesn't enable display (rendering) bit on the VDP, it just relies on previous game modes to do so.

You can find the missing piece to enable display under "SegaScreen:"

Code:

        move.w  ($FFFFF60C).w,d0
        ori.b   #$40,d0
        move.w  d0,($C00004).l

You can copy-paste this code above "Level_TtlCard:" and level should now display normally.

 

so i'm trying to make a flash happen before the boss appears
but its
uh
not going well as you can see
the palette gets stuck here

Code:

loc_6ED0:
        move.w    #$C3,d0
        bsr.w    PlaySound_Special
        bsr.w    Pal_MakeFlash
        bsr.w    Pal_WhiteToBlack
        move.w    #$8C,d0
        bsr.w    PlaySound    ; play boss music
        move.b    #1,($FFFFF7AA).w ; lock    screen
        addq.b    #2,($FFFFF742).w
        moveq    #$11,d0
        bra.w    LoadPLC        ; load boss patterns

here's what ive got in terms of code
can yall tell me what im doin wrong?

 

This Line is causing the problem. Remove it and it should work.

 

i added it because it gets stuck on a brighter white if i dont have it