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Hacking for VGMs

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Hacking for VGMs

Postby ValleyBell » Sat Jul 11, 2020 5:17 pm

Mickey's Ultimate Challenge, for helping Jason Ee with his pack:

Code: Select all
007A57      song ID for title screen (default: 09h)

verified BGM numbers are 01h..0Dh, the GEMS sequence file contains 80h songs in total

Make the game stay on the title screen forever (overwrite existing bytes):

Code: Select all
offset      byte code   ASM code            comment
------      ---------   --------            -------
007B8C      4EB8 05A6   JSR     $0005A6.w   ; wait for VSync
007B90      60FA        BRA.S   *-4         ; and do that forever


Additional patches for quick screen fading (i.e. less annoyance when booting the ROM)
Code: Select all
00712A      6A00 -> 6000    ; SEGA screen
00786C      6A00 -> 6000    ; Copyright screen
007926      6A00 -> 6000    ; Hi Tech Expressions screen
007A02      6A00 -> 6000    ; Designer Software screen
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ValleyBell
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Hacking for VGMs

Postby The789Guy » Sun Sep 27, 2020 4:27 pm

Does anyone have/know any Game Genie or PAR music modifier codes for Kawasaki Superbike Challenge? I was able to rip the main menu and options themes, but I still need to rip the race results theme, and there might be some unused songs.
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Hacking for VGMs

Postby The789Guy » Wed Sep 30, 2020 10:22 pm

ClayFighter (U) [!]

Interplay logo music / sound effect / DAC/PCM sample modifier:

000B36:4475
000B2C:00??
The789Guy
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Hacking for VGMs

Postby ValleyBell » Tue Oct 20, 2020 3:58 pm

Patch to disable the menu screen timer in Death and Return of Superman, The (U):

Code: Select all
003FD6  536D -> 382D  ; disable timer
012BDF  32 -> 00 ; skip the copyright screen (which can't be skipped otherwise)

The timer is located at address FF9540 (in 68k RAM) and it used for all screens, it seems.
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Hacking for VGMs

Postby The789Guy » Tue Oct 20, 2020 3:59 pm

Dude, thanks.
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Hacking for VGMs

Postby ValleyBell » Tue Nov 03, 2020 3:56 pm

Kawasaki Superbike Challenge

With a PAR code, you can easily rip songs from the menu screen.
  1. so to the Game Options menu
  2. turn the music off
  3. edit RAM address FFE8CF to the song you want to play
  4. turn the music on -> it will play the song ID from FFE8CF
The "PlaySong" function is located at ROM offset 0DFE4C.

Adventures of Rocky and Bullwinkle and Friends, The

You can patch the ROM to play a certain song at the SEGA screen.
Code: Select all
03C29E  05 A4 -> 00 02 ; ignore bad ROM checksum
04C0F7  03 -> xx ; where xx = sound IF
068B9C  6A -> 60 ; make it freeze on the SEGA screen

The "PlaySong" function is located at ROM offset 05618A.
ValleyBell
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Hacking for VGMs

Postby The789Guy » Tue Nov 03, 2020 4:12 pm

To simplify:

PAR code FFE8CF -- play song code.

With GEMSPlay, I found out that 00 and 05 are the song codes.
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