New set: F1

[kyu-sawamura]

Game: F1 (Europe), Formula One (US)
Publisher: Domark
Developer: Lankhor
Composer: Tiertex

This one has some extra gain, but I have another archive at the original volume at hand just in case.

Special thanks to ValleyBell for telling me where to edit the ROM to handle music playback.

[ValleyBell]

So, let me post some hacking information.

We're looking at "F1 World Championship (E) [!].bin" and "F1 World Championship (U) [!].bin" (GoodGen names). Note that "F1 World Championship Edition" is a different game. We're talking about F1 / Formula One.

Music is played using this code:

Code: Select all

4EB9 0000 32F2 jsr $32F2.l

The song ID is passed in register D0.
Both versions of the ROM (E and U) have Sound API calls at the same addresses.
0032F2 plays a song (song ID in D0, 00 - stop music, 01..04 - play song, 05 - invalid)
0032F6 play a sound effect? (not referenced by the game - there are no menu SFX, takes a 2-byte value in D0)
0032FA controls the music volume (volume in D0, mode in D1, the game always uses mode 00/volume F0)
0032FE pause music
003302 resume music
Racing effects are handled by a separate Z80 sound driver.

Now let's have some "useful" stuff. Disassembly offsets are for the (E) version.

Code: Select all

play title theme:
0D52BE  303C 0002       MOVE.W  #2, D0          ; D0 = song 2
0D52C2  4EB9 0000 32F2  JSR     $0032F2.l       ; call PlayMusic

play menu music:
0D79AA  3039 00FF E382  MOVE.W  $FFE382.l, D0   ; get menu music number
...
0D79C0  103B 00C6       MOVE.B  -$3A(PC,D0.w), D0 ; get song ID from table at 0D7988
0D79C4  4EB9 0000 32F2  JSR     $0032F2.l       ; call PlayMusic

For the menu music, it cycles through 3 songs (1, 3 and 4). The current menu song number for the look-up-table is stored at RAM offset E382/83.

Now let's summarize the important offsets:

Code: Select all

EU      US      Description
0032F2  0032F2  offset for PlayMusic call
0D52C1  0D5639  song ID for the title screen
0D7988  0D7DDA  look-up-table for menu songs