Initial import of Rock N' Roll Racing MSU-1 Hack

README.txt

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+Rock n' Roll Racing MSU-1 hack
+by DarkShock
+
+This hack adds support for the MSU-1 chip invented by byuu that
+supports CD quality audio and streaming 4Gb of data. This hack only uses the audio part of the
+chip.
+
+The hack is made for the 1.0 version of the game. Tested on SD2SNES.
+
+=============
+= Compiling =
+=============
+To compile the hack you need
+
+* asar 1.36 (http://www.smwcentral.net/?p=section&a=details&id=6000)
+* wav2msu (http://helmet.kafuka.org/thepile/Wav2msu)
+
+The rom needs to be named rnrr_msu1.sfc.
+
+For the name of the .wav files, look in the create_pcm.bat file.
+
+===========
+= Songs   =
+===========
+00 = Highway Star
+01 = Peter Gunn
+02 = Born to be Wild
+03 = Bad to the Bone
+04 = Paranoid
+
+========
+= TODO =
+========
+* Stop the music when the game ask for it
+* Duck (reduce) the volume when pausing the game in course
+* Make the manifest file for bsnes and higan

create_pcm.bat

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+@ECHO OFF
+
+del *.pcm
+
+wav2msu highway_star.wav rnrr_msu1-0.pcm
+wav2msu bark_at_the_moon.wav rnrr_msu1-1.pcm
+wav2msu born_to_be_wild.wav rnrr_msu1-2.pcm
+wav2msu bad_to_the_bone.wav rnrr_msu1-3.pcm
+wav2msu paranoid.wav rnrr_msu1-4.pcm

make.bat

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+@ECHO OFF
+
+del rnrr_msu1.sfc
+
+copy rnrr_original.smc rnrr_msu1.sfc
+asar rnrr_msu1_music.asm rnrr_msu1.sfc
+
+create_pcm.bat

rnrr_msu1.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<cartridge region="NTSC">
+	<msu1>
+		<map address="80-bf:2000-2007"/>
+		<mmio>
+			<map address="00-3f:2000-2007"/>
+			<map address="80-bf:2000-2007"/>
+		</mmio>
+	</msu1>
+</cartridge>

rnrr_msu1_music.asm

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+lorom
+
+; MSU memory map I/O
+MSU_STATUS = $2000
+MSU_ID = $2002
+MSU_AUDIO_TRACK_LO = $2004
+!MSU_AUDIO_TRACK_HI = $2005
+!MSU_AUDIO_VOLUME = $2006
+!MSU_AUDIO_CONTROL = $2007
+
+; SPC communication ports
+SPC_COMM_0 = $2140
+SPC_COMM_1 = $2141
+SPC_COMM_2 = $2142
+SPC_COMM_3 = $2143
+
+; MSU_STATUS possible values
+MSU_STATUS_TRACK_MISSING = $8
+MSU_STATUS_AUDIO_PLAYING = %00010000
+MSU_STATUS_AUDIO_REPEAT  = %00100000
+MSU_STATUS_AUDIO_BUSY    = $40
+MSU_STATUS_DATA_BUSY     = %10000000
+
+; Constants
+FULL_VOLUME = $FF
+
+; Hijack transfert SPC music after incrementing which song to play
+org $808129
+	jsr MSU_Main
+
+; Hijack for stop music
+org $808110
+	jsr MSU_Stop
+
+; Hack code
+org $80FF27
+MSU_Main:
+	php
+	rep #$30
+	pha
+	phx
+	phy
+
+	sep #$30
+	; Check if MSU-1 is present
+	lda.w MSU_ID
+	cmp #'S'
+	bne .MSUNotFound
+
+.MSUFound:
+	; Set track
+	sty.w MSU_AUDIO_TRACK_LO
+	stz.w !MSU_AUDIO_TRACK_HI
+
+.CheckAudioStatus
+	lda.w MSU_STATUS
+
+	and.b #MSU_STATUS_AUDIO_BUSY
+	bne .CheckAudioStatus
+
+	; Check if track is missing
+	lda.w MSU_STATUS
+	and.b #MSU_STATUS_TRACK_MISSING
+	bne .MSUNotFound
+
+	; Always loop the song
+	lda #$03
+	sta !MSU_AUDIO_CONTROL
+
+	; Set volume
+	lda.b #FULL_VOLUME
+	sta.w !MSU_AUDIO_VOLUME
+
+	rep #$30
+	ply
+	plx
+	pla
+	plp
+	rts
+
+; Call original routine if MSU-1 is not found
+.MSUNotFound:
+	rep #$30
+	ply
+	plx
+	pla
+	plp
+
+	jsr $F904
+	rts
+
+MSU_Stop:
+	php
+	rep #$30
+	pha
+
+	sep #$30
+	; Check if MSU-1 is present
+	lda.w MSU_ID
+	cmp #'S'
+	bne .MSUNotFound
+
+	lda #$00
+	sta !MSU_AUDIO_CONTROL
+
+	rep #$30
+	pla
+	plp
+	rts
+.MSUNotFound:
+	rep #$30
+	pla
+	plp
+
+	;jsr $F986
+	rts