[Sonic 1] Extra Music Slots in S1

I'm not sure who credit is to be given, but if you know who it is, let me know and i'll put the name here.


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To add more music slots to the sound test, search for this code in the level select routine:

Code:

LevSel_NoCheat:

        cmpi.w    #$94,d0    ; is sound $80-$94 being played?

        bcs.s    LevSel_PlaySnd; if yes, branch

        cmpi.w    #$A0,d0    ; is sound $95-$A0 being played?

        bcs.s    LevelSelect; if yes, branch

                                         

Change the line:

Code:

        cmpi.w    #$94,d0    ; is sound $80-$94 being played?

so it reads:

Code:

        cmpi.w    #$9F,d0    ; is sound $80-$94 being played?

then Rebuild the rom.


And now the sound test will have the music slots going up to 9F, instead of 94,

 

Not bad. I've moved this to the archives - hopefully this will start a trend.

 

Is it possible to do something similar in Sonic 2 without porting the Sonic 1 sound driver? Apparently the Sonic 2 sound driver is less flexible due to it being in Z80.

 

Not unless you disassemble the driver or something...

 

Heh ... Z80 code makes my eyes burn (I've only seen around 10 lines, admittedly, but still). I suppose it would be nice if the Sonic 2 driver was disassembled and examined in detail, but since it's possible to port the Sonic 1 driver to Sonic 2 with almost no side-effects, I suppose such work would be pretty useless.