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s2b.sounddriver.asm
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s2b.sounddriver.asm
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; ---------------------------------------------------------------------------
; NOTES:
;
; This code is compressed in the ROM, but you can edit it here as uncompressed
; and it will automatically be assembled and compressed into the correct place
; during the build process.
;
; This Z80 code can use labels and equates defined in the 68k code,
; and the 68k code can use the labels and equates defined in here.
; This is fortunate, as they contain references to each other's addresses.
;
; If you want to add significant amounts of extra code to this driver,
; try putting your code as far down as possible.
; That will make you less likely to run into space shortages from dislocated data alignment.
;
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
; Setup defines and macros
zStack = $1B80
zBankRegister = $6000
zROMWindow = $8000
; In what I believe is an unfortunate design choice in AS,
; both the phased and unphased PCs must be within the target processor's range,
; which means phase is useless here despite being designed to fix this problem...
; oh well, I set it up to fix this later when processing the .p file
!org 0 ; Z80 code starting at address 0 has special meaning to s2p2bin.exe
CPU Z80UNDOC
listing purecode
; Macro to perform a bank switch... after using this,
; the start of zROMWindow points to the start of the given 68k address,
; rounded down to the nearest $8000 byte boundary
bankswitch macro addr68k
xor a ; a = 0
ld e,1 ; e = 1
ld hl,zBankRegister
cnt := 0
rept 9
; this is either ld (hl),a or ld (hl),e
db (73h|((((addr68k)&(1<<(15+cnt)))==0)<<2))
cnt := (cnt+1)
endm
endm
; macro to make a certain error message clearer should you happen to get it...
rsttarget macro {INTLABEL}
if ($&7)||($>38h)
fatal "Function __LABEL__ is at 0\{$}h, but must be at a multiple of 8 bytes <= 38h to be used with the rst instruction."
endif
if "__LABEL__"<>""
__LABEL__ label $
endif
endm
; Function to turn a 68k address into a word the Z80 can use to access it,
; assuming the correct bank has been switched to first
zmake68kPtr function addr,zROMWindow+(addr&7FFFh)
; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
; Z80 'ROM' start:
; zEntryPoint:
di ; disable interrupts
ld sp,zStack
jp zStartDAC
; ---------------------------------------------------------------------------
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
align 8
; zsub_8:
zWaitForYM: rsttarget
; Performs the annoying task of waiting for the FM to not be busy
ld a,(4000h)
add a,a
jr c,zWaitForYM
ret
; End of function WaitForYM
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
align 8
; zsub_10:
zWriteFMIorII: rsttarget
bit 2,(ix+1)
jr z,zWriteFMI
jr zWriteFMII
; End of function zWriteFMIorII
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
align 8
; zsub_18
zWriteFMI: rsttarget
; Write reg/data pair to part I; 'a' is register, 'c' is data
push af
rst zWaitForYM
pop af
ld (4000h),a
push af
rst zWaitForYM
ld a,c
ld (4001h),a
pop af
ret
; End of function zWriteFMI
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
align 8
; zsub_28:
zWriteFMII: rsttarget
; Write reg/data pair to part II; 'a' is register, 'c' is data
push af
rst zWaitForYM
pop af
ld (4002h),a
push af
rst zWaitForYM
ld a,c
ld (4003h),a
pop af
ret
; End of function zWriteFMII
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
org 38h
VInt: rsttarget
push af
exx
call zBankSwitchToMusic
xor a
ld (byte_11AA), a ; 00 - Music Mode
ld ix, byte_1B80 ; 1B80 - Sound RAM
ld a, (byte_1B83) ; 1B83 = Pause Mode
or a
jr z, loc_51 ; 00 = not paused
call DoPause
jp RestoreDACBank
; ---------------------------------------------------------------------------
loc_51: ; CODE XREF: RAM:0049j
dec (ix+1) ; decrement Tempo Timeout (1B81)
call z, DoTempoDelay ; reached 00 - delay all tracks
ld a, (byte_1B84) ; 1B84 - remaining Fade Out Steps
or a
call nz, DoFadeOut
ld a, (byte_1B8E) ; 1B8E - Fade In Enable
or a
call nz, DoFadeIn
ld a, (byte_1B89) ; check Sound Queue
or (ix+0Ah)
or (ix+0Bh)
call nz, DoSoundQueue ; at least one of the 3 slots was filled
ld a, (byte_1B88)
cp 80h
call nz, PlaySoundID
ld a, 0FFh
ld (byte_1B87), a ; 1B87 - processing DAC channel (FF = yes)
ld ix, byte_1B97 ; 1B97 - Music Tracks
bit 7, (ix+0)
call nz, DrumUpdateTrack
xor a
ld (byte_1B87), a ; 1B87 = 00 - not processing the DAC channel anymore
ld b, 6
loc_8F: ; CODE XREF: RAM:009Dj
push bc
ld de, 2Ah
add ix, de
bit 7, (ix+0)
call nz, UpdateFMTrack
pop bc
djnz loc_8F
ld b, 3
loc_A1: ; CODE XREF: RAM:00AFj
push bc
ld de, 2Ah
add ix, de
bit 7, (ix+0)
call nz, UpdatePSGTrack
pop bc
djnz loc_A1
bankswitch SoundIndex
ld a, 80h
ld (byte_11AA), a ; 00 - SFX Mode
ld b, 3
loc_C7: ; CODE XREF: RAM:00D5j
push bc
ld de, 2Ah
add ix, de
bit 7, (ix+0)
call nz, UpdateFMTrack
pop bc
djnz loc_C7
ld b, 3
loc_D9: ; CODE XREF: RAM:00E7j
push bc
ld de, 2Ah
add ix, de
bit 7, (ix+0)
call nz, UpdatePSGTrack
pop bc
djnz loc_D9
RestoreDACBank: ; CODE XREF: RAM:004Ej RAM:0D09j
bankswitch DACSamples_Start
ld a, (byte_11A8) ; check, if a new DAC sound was queued
or a
jp m, loc_105 ; yes - jump
exx
ld b, 1
pop af
ei
ret
; ---------------------------------------------------------------------------
loc_105: ; CODE XREF: RAM:00FCj
ld a, 80h
ex af, af'
ld a, (byte_11A8)
sub 81h
ld (byte_11A8), a
add a, a
add a, a
add a, 75h ; add lower byte from 0F75
ld (loc_121+1), a
add a, 2
ld (loc_124+2), a
pop af
ld hl, loc_13C
ex (sp), hl
loc_121: ; DATA XREF: RAM:0114w
ld hl, (word_F75)
loc_124: ; DATA XREF: RAM:0119w
ld de, (word_F75+2)
loc_128: ; DATA XREF: RAM:01FAw
ld bc, 100h
ei
ret
; ---------------------------------------------------------------------------
; InitDriver:
zStartDAC:
call StopAllSound
ei
ld iy, DPCMData
ld de, 0
loc_138: ; CODE XREF: RAM:013Aj RAM:0176j
ld a, d
or e
jr z, loc_138
loc_13C: ; CODE XREF: RAM:loc_13Cj
; DATA XREF: RAM:011Do
djnz $
di
ld a, 2Ah
ld (4000h), a
ld a, (hl)
rlca
rlca
rlca
rlca
and 0Fh
ld (loc_14F+2), a
ex af, af'
loc_14F: ; DATA XREF: RAM:014Bw
add a, (iy+0)
ld (4001h), a
ex af, af'
ld b, c
ei
nop
loc_159: ; CODE XREF: RAM:loc_159j
djnz $
di
push af
pop af
ld a, 2Ah
ld (4000h), a
ld b, c
ld a, (hl)
inc hl
dec de
and 0Fh
ld (loc_16D+2), a
ex af, af'
loc_16D: ; DATA XREF: RAM:0169w
add a, (iy+0)
ld (4001h), a
ex af, af'
ei
nop
jp loc_138
; ---------------------------------------------------------------------------
DPCMData: db 0, 1, 2, 4, 8, 10h, 20h, 40h ; DATA XREF: RAM:0131o
db 80h,0FFh,0FEh,0FCh,0F8h,0F0h,0E0h,0C0h
BGMChnPtrs: dw 1C15h, 0, 1C3Fh, 1C69h, 1CBDh, 1CE7h, 1D11h, 1D11h
; DATA XREF: RAM:loc_86Br RAM:loc_91Fr ...
SFXChnPtrs: dw 1D3Bh, 0, 1D65h, 1D8Fh, 1DB9h, 1DE3h, 1E0Dh, 1E0Dh
; DATA XREF: RAM:loc_929r
; ---------------------------------------------------------------------------
DrumUpdateTrack: ; CODE XREF: RAM:0086p
dec (ix+0Bh)
ret nz
ld l, (ix+3)
ld h, (ix+4)
loc_1B3: ; CODE XREF: RAM:01BCj
ld a, (hl)
inc hl
cp 0E0h
jr c, loc_1BF
call zCoordFlag
jp loc_1B3
; ---------------------------------------------------------------------------
loc_1BF: ; CODE XREF: RAM:01B7j
or a
jp p, loc_1D5
ld (ix+0Dh), a
ld a, (hl)
or a
jp p, loc_1D4
ld a, (ix+0Ch)
ld (ix+0Bh), a
jp loc_1D8
; ---------------------------------------------------------------------------
loc_1D4: ; CODE XREF: RAM:01C8j
inc hl
loc_1D5: ; CODE XREF: RAM:01C0j
call TickMultiplier
loc_1D8: ; CODE XREF: RAM:01D1j
ld (ix+3), l
ld (ix+4), h
bit 2, (ix+0)
ret nz
ld a, (ix+0Dh)
cp 80h
ret z ; Drum 80 (null-drum) - return
sub 81h
add a, a ; else look up the DAC playlist
add a, 8Dh
ld (loc_1F1+2), a
loc_1F1: ; DATA XREF: RAM:01EEw
ld bc, (byte_F8D)
ld a, c
ld (byte_11A8), a ; request new DAC sound to be played
ld a, b
ld (loc_128+1), a ; set playback speed
ret
; =============== S U B R O U T I N E =======================================
UpdateFMTrack: ; CODE XREF: RAM:0099p RAM:00D1p
; FUNCTION CHUNK AT 0B9C SIZE 00000010 BYTES
dec (ix+0Bh)
jr nz, loc_210
res 4, (ix+0)
call TrkUpdate_FM
call SendFMFreq
jp DoNoteOn
; ---------------------------------------------------------------------------
loc_210: ; CODE XREF: UpdateFMTrack+3j
call DoNoteStop
call DoModulation
jp RefreshFMFreq
; End of function UpdateFMTrack
; =============== S U B R O U T I N E =======================================
TrkUpdate_FM: ; CODE XREF: UpdateFMTrack+9p
; FUNCTION CHUNK AT 027C SIZE 00000029 BYTES
; FUNCTION CHUNK AT 0E18 SIZE 0000001E BYTES
ld l, (ix+3)
ld h, (ix+4)
res 1, (ix+0)
loc_223: ; CODE XREF: TrkUpdate_FM+13j
ld a, (hl)
inc hl
cp 0E0h
jr c, loc_22F
call zCoordFlag
jp loc_223
; ---------------------------------------------------------------------------
loc_22F: ; CODE XREF: TrkUpdate_FM+Ej
push af
call DoNoteOff
pop af
or a
jp p, loc_241
call GetFMFreq
ld a, (hl)
or a
jp m, FinishTrkUpdate
inc hl
loc_241: ; CODE XREF: TrkUpdate_FM+1Cj
call TickMultiplier
jp FinishTrkUpdate
; End of function TrkUpdate_FM
; ---------------------------------------------------------------------------
GetFMFreq: ; CODE XREF: TrkUpdate_FM+1Fp
sub 80h
jr z, loc_25F
add a, (ix+5)
add a, a
add a, 1Bh
ld (loc_254+2), a
loc_254: ; DATA XREF: RAM:0251w
ld de, (FMFreqs)
ld (ix+0Dh), e
ld (ix+0Eh), d
ret
; ---------------------------------------------------------------------------
loc_25F: ; CODE XREF: RAM:0249j
set 1, (ix+0)
xor a
ld (ix+0Dh), a
ld (ix+0Eh), a
ret
; =============== S U B R O U T I N E =======================================
TickMultiplier: ; CODE XREF: RAM:loc_1D5p
; TrkUpdate_FM:loc_241p ...
ld c, a
ld b, (ix+2)
loc_26F: ; CODE XREF: TickMultiplier+Ej
djnz loc_278
ld (ix+0Ch), a
ld (ix+0Bh), a
ret
; ---------------------------------------------------------------------------
loc_278: ; CODE XREF: TickMultiplier:loc_26Fj
add a, c
jp loc_26F
; End of function TickMultiplier
; ---------------------------------------------------------------------------
; START OF FUNCTION CHUNK FOR TrkUpdate_FM
FinishTrkUpdate: ; CODE XREF: TrkUpdate_FM+24j
; TrkUpdate_FM+2Bj ...
ld (ix+3), l
ld (ix+4), h
ld a, (ix+0Ch)
ld (ix+0Bh), a
bit 4, (ix+0)
ret nz
ld a, (ix+10h)
ld (ix+0Fh), a
ld (ix+9), 0
bit 3, (ix+0)
ret z
ld l, (ix+11h)
ld h, (ix+12h)
jp loc_E18
; END OF FUNCTION CHUNK FOR TrkUpdate_FM
; =============== S U B R O U T I N E =======================================
DoNoteStop: ; CODE XREF: UpdateFMTrack:loc_210p
; UpdatePSGTrack:loc_4A8p
ld a, (ix+0Fh)
or a
ret z
dec (ix+0Fh)
ret nz
set 1, (ix+0)
pop de
bit 7, (ix+1)
jp nz, PSGNoteOff
jp DoNoteOff
; End of function DoNoteStop
; =============== S U B R O U T I N E =======================================
DoModulation: ; CODE XREF: UpdateFMTrack+15p
; UpdatePSGTrack+18p
pop de
bit 1, (ix+0)
ret nz
bit 3, (ix+0)
ret z
ld a, (ix+13h)
or a
jr z, loc_2D2
dec (ix+13h)
ret
; ---------------------------------------------------------------------------
loc_2D2: ; CODE XREF: DoModulation+Fj
dec (ix+14h)
ret nz
ld l, (ix+11h)
ld h, (ix+12h)
inc hl
ld a, (hl)
ld (ix+14h), a
ld a, (ix+16h)
or a
jr nz, loc_2F6
inc hl
inc hl
ld a, (hl)
ld (ix+16h), a
ld a, (ix+15h)
neg
ld (ix+15h), a
ret
; ---------------------------------------------------------------------------
loc_2F6: ; CODE XREF: DoModulation+28j
dec (ix+16h)
ld l, (ix+17h)
ld h, (ix+18h)
ld b, 0
ld c, (ix+15h)
bit 7, c
jp z, loc_30B
ld b, 0FFh
loc_30B: ; CODE XREF: DoModulation+49j
add hl, bc
ld (ix+17h), l
ld (ix+18h), h
ld c, (ix+0Dh)
ld b, (ix+0Eh)
add hl, bc
ex de, hl
jp (hl)
; End of function DoModulation
; ---------------------------------------------------------------------------
FMFreqs: dw 25Eh, 284h, 2ABh, 2D3h, 2FEh, 32Dh, 35Ch, 38Fh, 3C5h, 3FFh, 43Ch, 47Ch
; DATA XREF: RAM:loc_254r
dw 0A5Eh,0A84h,0AABh,0AD3h,0AFEh,0B2Dh,0B5Ch,0B8Fh,0BC5h,0BFFh,0C3Ch,0C7Ch
dw 125Eh,1284h,12ABh,12D3h,12FEh,132Dh,135Ch,138Fh,13C5h,13FFh,143Ch,147Ch
dw 1A5Eh,1A84h,1AABh,1AD3h,1AFEh,1B2Dh,1B5Ch,1B8Fh,1BC5h,1BFFh,1C3Ch,1C7Ch
dw 225Eh,2284h,22ABh,22D3h,22FEh,232Dh,235Ch,238Fh,23C5h,23FFh,243Ch,247Ch
dw 2A5Eh,2A84h,2AABh,2AD3h,2AFEh,2B2Dh,2B5Ch,2B8Fh,2BC5h,2BFFh,2C3Ch,2C7Ch
dw 325Eh,3284h,32ABh,32D3h,32FEh,332Dh,335Ch,338Fh,33C5h,33FFh,343Ch,347Ch
dw 3A5Eh,3A84h,3AABh,3AD3h,3AFEh,3B2Dh,3B5Ch,3B8Fh,3BC5h,3BFFh,3C3Ch,3C7Ch
; =============== S U B R O U T I N E =======================================
SendFMFreq: ; CODE XREF: UpdateFMTrack+Cp
bit 1, (ix+0)
ret nz
ld e, (ix+0Dh)
ld d, (ix+0Eh)
ld a, d
or e
jp z, loc_542
RefreshFMFreq: ; CODE XREF: UpdateFMTrack+18j
bit 2, (ix+0)
ret nz
ld h, 0
ld l, (ix+19h)
bit 7, l
jr z, loc_3FB
ld h, 0FFh
loc_3FB: ; CODE XREF: SendFMFreq+1Cj
add hl, de
ld c, h
ld a, (ix+1)
and 3
add a, 0A4h
rst zWriteFMIorII
ld c, l
sub 4
rst zWriteFMIorII
ret
; End of function SendFMFreq
; ---------------------------------------------------------------------------
PSGFreqs: dw 356h, 326h, 2F9h, 2CEh, 2A5h, 280h, 25Ch, 23Ah, 21Ah, 1FBh, 1DFh, 1C4h
; DATA XREF: RAM:loc_4EAr
dw 1ABh, 193h, 17Dh, 167h, 153h, 140h, 12Eh, 11Dh, 10Dh, 0FEh, 0EFh, 0E2h
dw 0D6h, 0C9h, 0BEh, 0B4h, 0A9h, 0A0h, 97h, 8Fh, 87h, 7Fh, 78h, 71h
dw 6Bh, 65h, 5Fh, 5Ah, 55h, 50h, 4Bh, 47h, 43h, 40h, 3Ch, 39h
dw 36h, 33h, 30h, 2Dh, 2Bh, 28h, 26h, 24h, 22h, 20h, 1Fh, 1Dh
dw 1Bh, 1Ah, 18h, 17h, 16h, 15h, 13h, 12h, 11h, 0
; =============== S U B R O U T I N E =======================================
UpdatePSGTrack: ; CODE XREF: RAM:00ABp RAM:00E3p
dec (ix+0Bh)
jr nz, loc_4A8
res 4, (ix+0)
call TrkUpdate_PSG
call SendPSGFreq
jp DoPSGNoteOn
; ---------------------------------------------------------------------------
loc_4A8: ; CODE XREF: UpdatePSGTrack+3j
call DoNoteStop
call DoVolEnv
call DoModulation
jp RefreshPSGFreq
; End of function UpdatePSGTrack
; =============== S U B R O U T I N E =======================================
TrkUpdate_PSG: ; CODE XREF: UpdatePSGTrack+9p
ld l, (ix+3)
ld h, (ix+4)
res 1, (ix+0)
loc_4BE: ; CODE XREF: TrkUpdate_PSG+13j
ld a, (hl)
inc hl
cp 0E0h
jr c, loc_4CA
call zCoordFlag
jp loc_4BE
; ---------------------------------------------------------------------------
loc_4CA: ; CODE XREF: TrkUpdate_PSG+Ej
or a
jp p, loc_4D7
call GetPSGFreq
ld a, (hl)
or a
jp m, FinishTrkUpdate
inc hl
loc_4D7: ; CODE XREF: TrkUpdate_PSG+17j
call TickMultiplier
jp FinishTrkUpdate
; End of function TrkUpdate_PSG
; ---------------------------------------------------------------------------
GetPSGFreq: ; CODE XREF: TrkUpdate_PSG+1Ap
sub 81h
jr c, loc_4F5
add a, (ix+5)
add a, a
add a, 0Ah
ld (loc_4EA+2), a
loc_4EA: ; DATA XREF: RAM:04E7w
ld de, (PSGFreqs)
ld (ix+0Dh), e
ld (ix+0Eh), d
ret
; ---------------------------------------------------------------------------
loc_4F5: ; CODE XREF: RAM:04DFj
set 1, (ix+0)
ld a, 0FFh
ld (ix+0Dh), a
ld (ix+0Eh), a
jp PSGNoteOff
; =============== S U B R O U T I N E =======================================
SendPSGFreq: ; CODE XREF: UpdatePSGTrack+Cp
bit 7, (ix+0Eh)
jr nz, loc_542
ld e, (ix+0Dh)
ld d, (ix+0Eh)
RefreshPSGFreq: ; CODE XREF: UpdatePSGTrack+1Bj
ld a, (ix+0)
and 6
ret nz
ld h, 0
ld l, (ix+19h)
bit 7, l
jr z, loc_521
ld h, 0FFh
loc_521: ; CODE XREF: SendPSGFreq+19j
add hl, de
ld a, (ix+1)
cp 0E0h
jr nz, loc_52B
ld a, 0C0h
loc_52B: ; CODE XREF: SendPSGFreq+23j
ld b, a
ld a, l
and 0Fh
or b
ld (7F11h), a
ld a, l
srl h
rra
srl h
rra
rra
rra
and 3Fh
ld (7F11h), a
ret
; ---------------------------------------------------------------------------
loc_542: ; CODE XREF: SendFMFreq+Dj
; SendPSGFreq+4j
set 1, (ix+0)
ret
; End of function SendPSGFreq
; =============== S U B R O U T I N E =======================================
DoVolEnv: ; CODE XREF: UpdatePSGTrack+15p
; FUNCTION CHUNK AT 059F SIZE 00000004 BYTES
ld a, (ix+8)
or a
ret z
DoPSGNoteOn: ; CODE XREF: UpdatePSGTrack+Fj
ld b, (ix+6)
ld a, (ix+8)
or a
jr z, SendPSGVolume
ld hl, VolEnvPtrs
dec a
add a, a
ld e, a
ld d, 0
add hl, de
ld a, (hl)
inc hl
ld h, (hl)
add a, (ix+9)
ld l, a
adc a, h
sub l
ld h, a
ld a, (hl)
inc (ix+9)
or a
jp p, loc_574
cp 80h
jr z, loc_59F
loc_574: ; CODE XREF: DoVolEnv+26j
add a, b
cp 10h
jr c, loc_57B
ld a, 0Fh
loc_57B: ; CODE XREF: DoVolEnv+30j
ld b, a
; End of function DoVolEnv
; =============== S U B R O U T I N E =======================================
SendPSGVolume: ; CODE XREF: DoVolEnv+Cj DoFadeOut+57p ...
ld a, (ix+0)
and 6
ret nz
bit 4, (ix+0)
jr nz, loc_592
loc_588: ; CODE XREF: SendPSGVolume+1Aj
; SendPSGVolume+20j
ld a, (ix+1)
or b
add a, 10h
ld (7F11h), a
ret
; ---------------------------------------------------------------------------
loc_592: ; CODE XREF: SendPSGVolume+Aj
ld a, (ix+10h)
or a
jr z, loc_588
ld a, (ix+0Fh)
or a
jr nz, loc_588
ret
; End of function SendPSGVolume
; ---------------------------------------------------------------------------
; START OF FUNCTION CHUNK FOR DoVolEnv
loc_59F: ; CODE XREF: DoVolEnv+2Bj
dec (ix+9)
ret
; END OF FUNCTION CHUNK FOR DoVolEnv
; =============== S U B R O U T I N E =======================================
PSGNoteOff: ; CODE XREF: DoNoteStop+12j RAM:0501j ...
bit 2, (ix+0)
ret nz
ld a, (ix+1)
or 1Fh
ld (7F11h), a
ret
; End of function PSGNoteOff
; ---------------------------------------------------------------------------
; START OF FUNCTION CHUNK FOR StopAllSound
SilencePSG: ; CODE XREF: DoPause+Dj
; StopAllSound+23j ...
ld hl, 7F11h
ld (hl), 9Fh
ld (hl), 0BFh
ld (hl), 0DFh
ld (hl), 0FFh
ret
; END OF FUNCTION CHUNK FOR StopAllSound
; =============== S U B R O U T I N E =======================================
DoPause: ; CODE XREF: RAM:004Bp
jp m, UnpauseMusic ; 80-FF - request Unpause
cp 2 ; 02 - already paused?
ret z ; yes - return
ld (ix+3), 2 ; 01 - request Pause, set to 02
call SilenceFM
jp SilencePSG
; ---------------------------------------------------------------------------
UnpauseMusic: ; CODE XREF: DoPausej
push ix
ld (ix+3), 0
ld ix, 1B97h
ld b, 7
call sub_5FA
bankswitch SoundIndex
ld ix, 1D3Bh
ld b, 3
call sub_5FA
call zBankSwitchToMusic
pop ix
ret
; End of function DoPause
; =============== S U B R O U T I N E =======================================
sub_5FA: ; CODE XREF: DoPause+1Cp DoPause+34p ...
bit 7, (ix+0)
jr z, loc_619
bit 2, (ix+0)
jr nz, loc_619
ld c, (ix+7)
ld a, (ix+1)
and 3
add a, 0B4h ; '´'
rst 10h
push bc
ld a, (ix+8)
call SendFMIns
pop bc
loc_619: ; CODE XREF: sub_5FA+4j sub_5FA+Aj
ld de, 2Ah ; '*'
add ix, de
djnz sub_5FA
ret
; End of function sub_5FA
; =============== S U B R O U T I N E =======================================
DoSoundQueue: ; CODE XREF: RAM:006Ep
ld a, (byte_1B88)
cp 80h
ret nz ; Play Sound slot is full - return
ld hl, byte_1B89
ld a, (byte_1B80) ; 1B80 - current SFX Priority
ld c, a
ld b, 3
loc_630: ; CODE XREF: DoSoundQueue:loc_65Bj
ld a, (hl)
ld e, a
ld (hl), 0
inc hl
cp MusID__First
jr c, loc_65B
sub 0A0h
jr nc, loc_642
ld a, e
ld (byte_1B88), a
ret
; ---------------------------------------------------------------------------
loc_642: ; CODE XREF: DoSoundQueue+1Aj
push hl
add a, 30h ; add lower byte of 0F30 (SndPriorities)
ld l, a
adc a, 0Fh ; higher byte of 0F30 (SndPriorities)
sub l
ld h, a
ld a, (hl)
cp c
jr c, loc_653
ld c, a
ld a, e
ld (byte_1B88), a
loc_653: ; CODE XREF: DoSoundQueue+2Bj
pop hl
ld a, c
or a
ret m
ld (byte_1B80), a
ret
; ---------------------------------------------------------------------------
loc_65B: ; CODE XREF: DoSoundQueue+16j
djnz loc_630
ret
; End of function DoSoundQueue
; ---------------------------------------------------------------------------
PlaySoundID: ; CODE XREF: RAM:0076p
or a
jp z, StopAllSound
ret p ; 00-7F - Stop All
ld (ix+8), 80h
cp MusID__End
jp c, zPlayMusic ; 80-9F - Music
cp 0A0h
ret c
cp 0E1h
jp c, PlaySFX ; A0-E0 - SFX
cp 0F9h
ret c ; E2-F8 - unused
cp 0FEh
ret nc ; FE-FF - unused
PlaySnd_Command: ; F9-FD - Special Commands
sub 0F9h
add a, a
add a, a
ld (loc_681+1), a
loc_681: ; CODE XREF: RAM:loc_681j
; DATA XREF: RAM:067Ew
jr $
; ---------------------------------------------------------------------------
jp FadeOutMusic ; F9
; ---------------------------------------------------------------------------
nop
jp PlaySegaSound ; FA
; ---------------------------------------------------------------------------
nop
jp SpeedUpMusic ; FB
; ---------------------------------------------------------------------------