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hessiansid.s
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processor 6502
org $0000
SUBTUNES = 22
dc.b "PSID"
dc.b 0,2
dc.b 0,$7c
dc.b $00,$00
dc.b $10,$00
dc.b $10,$03
dc.b 0,SUBTUNES
dc.b 0,1
dc.b 0,0,0,0
org $0016
dc.b "Hessian"
org $0036
dc.b "Cadaver & NecroPolo"
org $0056
dc.b "2015 Covert Bitops"
org $007c
dc.b $00,$10
rorg $1000
ntTemp1 = $f8
ntTemp2 = $f9
ntTrackLo = $fa
ntTrackHi = $fb
ntFiltPos = $fc
ntFiltTime = $fd
ntFiltCutoff = $fe
orgMusicData = $f800
musicData = $c000
NT_FIRSTNOTE = $18
NT_DUR = $c0
NT_HEADERLENGTH = 6
NT_NUMFIXUPS = 21
NT_ADDZERO = $80
NT_ADDWAVE = $00
NT_ADDPULSE = $04
NT_ADDFILT = $08
NT_ADDCMD = $0c
NT_ADDLEGATOCMD = $10
NT_ADDPATT = $14
NT_HRPARAM = $00
NT_FIRSTWAVE = $09
jmp Init
Play:
; Play one frame of music & sound effects
;
; Parameters: -
; Returns: -
; Modifies: A,X,Y,player vars
Play: ldx #$00
Play_InitFlag: lda #$00
bmi Play_FiltExec
;New song initialization
Play_DoInit: asl
asl
adc Play_InitFlag+1
tay
Play_SongTblP0: lda $1000,y
sta ntTrackLo
Play_SongTblP1: lda $1000,y
sec
sbc #>(orgMusicData-musicData)
sta ntTrackHi
txa
sta ntFiltPos
sta $d417
ldx #21
Play_InitLoop: sta ntChnPattPos-1,x
dex
bne Play_InitLoop
jsr Play_InitChn
ldx #$07
jsr Play_InitChn
ldx #$0e
Play_InitChn:
Play_SongTblP2: lda $1000,y
sta ntChnSongPos,x
iny
lda #$ff
sta ntChnNewNote,x
sta ntChnDuration,x
sta Play_InitFlag+1
rts
;Filter execution
Play_FiltExec: ldy ntFiltPos
beq Play_FiltDone
Play_FiltTimeM1:lda $1000,y
bpl Play_FiltMod
cmp #$ff
bcs Play_FiltJump
Play_SetFilt: sta $d417
and #$70
sta Play_FiltDone+1
Play_FiltJump:
Play_FiltSpdM1a:lda $1000,y
bcs Play_FiltJump2
Play_NextFilt: inc ntFiltPos
bcc Play_StoreCutoff
Play_FiltJump2: sta ntFiltPos
bcs Play_FiltDone
Play_FiltMod: clc
dec ntFiltTime
bmi Play_NewFiltMod
bne Play_FiltCutoff
inc ntFiltPos
bcc Play_FiltDone
Play_NewFiltMod:sta ntFiltTime
Play_FiltCutoff:lda ntFiltCutoff
Play_FiltSpdM1b:adc $1000,y
Play_StoreCutoff:
sta ntFiltCutoff
sta $d416
Play_FiltDone: lda #$00
Play_MasterVolume:
ora #$0f
sta $d418
;Channel execution
jsr Play_ChnExec
ldx #$07
jsr Play_ChnExec
ldx #$0e
;Update duration counter
Play_ChnExec: inc ntChnCounter,x
bne Play_NoPattern
;Get data from pattern
Play_Pattern: ldy ntChnPattNum,x
Play_PattTblLoM1:
lda $1000,y
sta ntTemp1
Play_PattTblHiM1:
lda $1000,y
sec
sbc #>(orgMusicData-musicData)
sta ntTemp2
ldy ntChnPattPos,x
lda (ntTemp1),y
lsr
sta ntChnNewNote,x
bcc Play_NoNewCmd
Play_NewCmd: iny
lda (ntTemp1),y
sta ntChnCmd,x
bcc Play_Rest
Play_CheckHr: bmi Play_Rest
lda ntChnSfx,x
bne Play_Rest
lda #$fe
sta ntChnGate,x
sta $d405,x
lda #NT_HRPARAM
sta $d406,x
Play_Rest: iny
lda (ntTemp1),y
cmp #$c0
bcc Play_NoNewDur
iny
sta ntChnDuration,x
Play_NoNewDur: lda (ntTemp1),y
beq Play_EndPatt
tya
Play_EndPatt: sta ntChnPattPos,x
Play_JumpToWave:jmp Play_WaveExec
;No new command, or gate control
Play_NoNewCmd: cmp #NT_FIRSTNOTE/2
bcc Play_GateCtrl
lda ntChnCmd,x
bcs Play_CheckHr
Play_GateCtrl: lsr
ora #$fe
sta ntChnGate,x
bcc Play_NewCmd
sta ntChnNewNote,x
bcs Play_Rest
;No new pattern data
Play_LegatoCmd: tya
and #$7f
tay
bpl Play_SkipAdsr
Play_JumpToPulse:
jmp Play_PulseExec
Play_NoPattern: lda ntChnCounter,x
cmp #$02
bne Play_JumpToPulse
;Reload counter and check for new note / command exec / track access
Play_Reload: lda ntChnDuration,x
sta ntChnCounter,x
lda ntChnNewNote,x
bpl Play_NewNoteInit
lda ntChnPattPos,x
bne Play_JumpToPulse
;Get data from track
Play_Track: ldy ntChnSongPos,x
lda (ntTrackLo),y
bne Play_NoSongJump
iny
lda (ntTrackLo),y
tay
lda (ntTrackLo),y
Play_NoSongJump:bpl Play_NoSongTrans
sta ntChnTrans,x
iny
lda (ntTrackLo),y
Play_NoSongTrans:
sta ntChnPattNum,x
iny
tya
sta ntChnSongPos,x
bcs Play_JumpToWave
bcc Play_CmdExecuted
;New note init / command exec
Play_NewNoteInit:
cmp #NT_FIRSTNOTE/2
bcc Play_SkipNote
adc ntChnTrans,x
asl
sta ntChnNote,x
sec
Play_SkipNote: ldy ntChnCmd,x
bmi Play_LegatoCmd
Play_CmdADM1: lda $1000,y
sta $d405,x
Play_CmdSRM1: lda $1000,y
sta $d406,x
bcc Play_SkipGate
lda #$ff
sta ntChnGate,x
lda #$09
sta $d404,x
Play_SkipGate:
Play_SkipAdsr:
Play_CmdWaveM1: lda $1000,y
beq Play_SkipWave
sta ntChnWavePos,x
lda #$00
sta ntChnWaveTime,x
Play_SkipWave:
Play_CmdPulseM1:lda $1000,y
beq Play_SkipPulse
sta ntChnPulsePos,x
lda #$00
sta ntChnPulseTime,x
Play_SkipPulse:
Play_CmdFiltM1: lda $1000,y
beq Play_SkipFilt
sta ntFiltPos
lda #$00
sta ntFiltTime
Play_SkipFilt: clc
lda ntChnPattPos,x
beq Play_Track
Play_CmdExecuted:
Play_NoTrack: rts
;Pulse execution
Play_NoPulseMod:cmp #$ff
Play_PulseSpdM1a:
lda $1000,y
bcs Play_PulseJump
inc ntChnPulsePos,x
bcc Play_StorePulse
Play_PulseJump: sta ntChnPulsePos,x
bcs Play_PulseDone
Play_PulseExec: ldy ntChnPulsePos,x
beq Play_PulseDone
Play_PulseTimeM1:
lda $1000,y
bmi Play_NoPulseMod
Play_PulseMod: clc
dec ntChnPulseTime,x
bmi Play_NewPulseMod
bne Play_NoNewPulseMod
inc ntChnPulsePos,x
bcc Play_PulseDone
Play_NewPulseMod:
sta ntChnPulseTime,x
Play_NoNewPulseMod:
lda ntChnPulse,x
Play_PulseSpdM1b:
adc $1000,y
adc #$00
Play_StorePulse:sta ntChnPulse,x
sta $d402,x
sta $d403,x
Play_PulseDone:
;Wavetable execution
Play_WaveExec: ldy ntChnWavePos,x
beq Play_WaveDone
Play_WaveM1: lda $1000,y
cmp #$c0
bcs Play_SlideOrVib
cmp #$90
bcc Play_WaveChange
;Delayed wavetable
Play_WaveDelay: beq Play_NoWaveChange
dec ntChnWaveTime,x
beq Play_NoWaveChange
bpl Play_WaveDone
sbc #$90
sta ntChnWaveTime,x
bcs Play_WaveDone
;Wave change + arpeggio
Play_WaveChange:sta ntChnWave,x
tya
sta ntChnWaveOld,x
Play_NoWaveChange:
Play_WaveP0: lda $1000,y
cmp #$ff
bcs Play_WaveJump
Play_NoWaveJump:inc ntChnWavePos,x
bcc Play_WaveJumpDone
Play_WaveJump:
Play_NoteP0: lda $1000,y
sta ntChnWavePos,x
Play_WaveJumpDone:
Play_NoteM1a: lda $1000,y
asl
bcs Play_AbsFreq
adc ntChnNote,x
Play_AbsFreq: tay
bne Play_NoteNum
Play_SlideDone: ldy ntChnNote,x
lda ntChnWaveOld,x
sta ntChnWavePos,x
Play_NoteNum: lda ntFreqTbl-24,y
sta ntChnFreqLo,x
sta $d400,x
lda ntFreqTbl-23,y
Play_StoreFreqHi:
sta $d401,x
sta ntChnFreqHi,x
Play_WaveDone: lda ntChnWave,x
and ntChnGate,x
sta $d404,x
rts
;Slide or vibrato
Play_SlideOrVib:sbc #$e0
sta ntTemp1
lda ntChnCounter,x
beq Play_WaveDone
Play_NoteM1b: lda $1000,y
sta ntTemp2
bcc Play_Vibrato
;Slide (toneportamento)
Play_Slide: ldy ntChnNote,x
lda ntChnFreqLo,x
sbc ntFreqTbl-24,y
pha
lda ntChnFreqHi,x
sbc ntFreqTbl-23,y
tay
pla
bcs Play_SlideDown
Play_Slideup: adc ntTemp2
tya
adc ntTemp1
bcs Play_SlideDone
Play_FreqAdd: lda ntChnFreqLo,x
adc ntTemp2
sta ntChnFreqLo,x
sta $d400,x
lda ntChnFreqHi,x
adc ntTemp1
jmp Play_StoreFreqHi
Play_SlideDown: sbc ntTemp2
tya
sbc ntTemp1
bcc Play_SlideDone
Play_FreqSub: lda ntChnFreqLo,x
sbc ntTemp2
sta ntChnFreqLo,x
sta $d400,x
lda ntChnFreqHi,x
sbc ntTemp1
jmp Play_StoreFreqHi
;Vibrato
Play_Vibrato: lda ntChnWaveTime,x
bpl Play_VibNoDir
cmp ntTemp1
bcs Play_VibNoDir2
eor #$ff
Play_VibNoDir: sec
Play_VibNoDir2: sbc #$02
sta ntChnWaveTime,x
lsr
lda #$00
sta ntTemp1
bcc Play_FreqAdd
bcs Play_FreqSub
;Init subtune
Init: tay
ldx subTuneModuleTbl,y
lda subTuneTuneTbl,y
pha
lda moduleTblLo,x
sta InitCopyLda+1
sta InitCopyLda2+1
lda moduleTblHi,x
sta InitCopyLda+2
clc
adc #$07
sta InitCopyLda2+2
lda #>musicData
sta InitCopySta+2
ldy #$07
ldx #$00
InitCopyLda: lda $1000,x
InitCopySta: sta musicData,x
inx
bne InitCopyLda
inc InitCopyLda+2
inc InitCopySta+2
dey
bne InitCopyLda
InitCopyLda2: lda $1000,x
InitCopySta2: sta musicData+$700,x
inx
cpx #$fa
bne InitCopyLda2
InitMusicData: lda #<(musicData+NT_HEADERLENGTH-1)
sta ntTrackLo
lda #>(musicData+NT_HEADERLENGTH-1)
sta ntTrackHi
ldx #NT_NUMFIXUPS-1
IMD_Loop: lda ntFixupTblLo,x
sta IMD_Store+1
lda ntFixupTblHi,x
sta IMD_Store+2
lda ntFixupTblAdd,x
pha
bmi IMD_AddDone
lsr
lsr
IMD_AddSize: tay
IMD_GetSize: lda musicData,y
clc
adc ntTrackLo
sta ntTrackLo
bcc IMD_AddDone
inc ntTrackHi
IMD_AddDone: pla
and #$03
clc
adc ntTrackLo
ldy #$01
jsr IMD_Store
lda #$00
adc ntTrackHi
iny
jsr IMD_Store
dex
bpl IMD_Loop
pla
sta Play_InitFlag+1
rts
IMD_Store: sta Play,y
rts
; Music relocation tables
ntFixupTblLo: dc.b <Play_SongTblP2
dc.b <Play_SongTblP1
dc.b <Play_SongTblP0
dc.b <Play_PattTblHiM1
dc.b <Play_PattTblLoM1
dc.b <Play_CmdFiltM1
dc.b <Play_CmdPulseM1
dc.b <Play_CmdWaveM1
dc.b <Play_CmdSRM1
dc.b <Play_CmdADM1
dc.b <Play_FiltSpdM1b
dc.b <Play_FiltSpdM1a
dc.b <Play_FiltTimeM1
dc.b <Play_PulseSpdM1b
dc.b <Play_PulseSpdM1a
dc.b <Play_PulseTimeM1
dc.b <Play_NoteP0
dc.b <Play_NoteM1b
dc.b <Play_NoteM1a
dc.b <Play_WaveP0
dc.b <Play_WaveM1
ntFixupTblHi: dc.b >Play_SongTblP2
dc.b >Play_SongTblP1
dc.b >Play_SongTblP0
dc.b >Play_PattTblHiM1
dc.b >Play_PattTblLoM1
dc.b >Play_CmdFiltM1
dc.b >Play_CmdPulseM1
dc.b >Play_CmdWaveM1
dc.b >Play_CmdSRM1
dc.b >Play_CmdADM1
dc.b >Play_FiltSpdM1b
dc.b >Play_FiltSpdM1a
dc.b >Play_FiltTimeM1
dc.b >Play_PulseSpdM1b
dc.b >Play_PulseSpdM1a
dc.b >Play_PulseTimeM1
dc.b >Play_NoteP0
dc.b >Play_NoteM1b
dc.b >Play_NoteM1a
dc.b >Play_WaveP0
dc.b >Play_WaveM1
ntFixupTblAdd: dc.b NT_ADDZERO+3
dc.b NT_ADDZERO+2
dc.b NT_ADDPATT+1
dc.b NT_ADDPATT
dc.b NT_ADDLEGATOCMD
dc.b NT_ADDLEGATOCMD
dc.b NT_ADDLEGATOCMD
dc.b NT_ADDCMD
dc.b NT_ADDCMD
dc.b NT_ADDFILT
dc.b NT_ADDZERO
dc.b NT_ADDFILT
dc.b NT_ADDPULSE
dc.b NT_ADDZERO
dc.b NT_ADDPULSE
dc.b NT_ADDWAVE
dc.b NT_ADDZERO+1
dc.b NT_ADDZERO
dc.b NT_ADDWAVE
dc.b NT_ADDZERO+1
dc.b NT_ADDZERO
; Frequency table
ntFreqTbl: dc.w $022d,$024e,$0271,$0296,$02be,$02e8
dc.w $0314,$0343,$0374,$03a9,$03e1,$041c
dc.w $045a,$049c,$04e2,$052d,$057c,$05cf
dc.w $0628,$0685,$06e8,$0752,$07c1,$0837
dc.w $08b4,$0939,$09c5,$0a5a,$0af7,$0b9e
dc.w $0c4f,$0d0a,$0dd1,$0ea3,$0f82,$106e
dc.w $1168,$1271,$138a,$14b3,$15ee,$173c
dc.w $189e,$1a15,$1ba2,$1d46,$1f04,$20dc
dc.w $22d0,$24e2,$2714,$2967,$2bdd,$2e79
dc.w $313c,$3429,$3744,$3a8d,$3e08,$41b8
dc.w $45a1,$49c5,$4e28,$52cd,$57ba,$5cf1
dc.w $6278,$6853,$6e87,$751a,$7c10,$8371
dc.w $8b42,$9389,$9c4f,$a59b,$af74,$b9e2
dc.w $c4f0,$d0a6,$dd0e,$ea33,$f820,$ffff
; Playroutine variables
ntChnPattPos: dc.b 0
ntChnCounter: dc.b 0
ntChnNewNote: dc.b 0
ntChnWavePos: dc.b 0
ntChnPulsePos: dc.b 0
ntChnWave: dc.b 0
ntChnPulse: dc.b 0
dc.b 0,0,0,0,0,0,0
dc.b 0,0,0,0,0,0,0
ntChnGate: dc.b $fe
ntChnTrans: dc.b $ff
ntChnCmd: dc.b $01
ntChnSongPos: dc.b 0
ntChnPattNum: dc.b 0
ntChnDuration: dc.b 0
ntChnNote: dc.b 0
dc.b $fe,$ff,$01,0,0,0,0
dc.b $fe,$ff,$01,0,0,0,0
ntChnFreqLo: dc.b 0
ntChnFreqHi: dc.b 0
ntChnWaveTime: dc.b 0
ntChnPulseTime: dc.b 0
ntChnSfx: dc.b 0
ntChnSfxLo: dc.b 0
ntChnSfxHi:
ntChnWaveOld: dc.b 0
dc.b 0,0,0,0,0,0,0
dc.b 0,0,0,0,0,0,0
; Music modules
moduleTblLo: dc.b <module0
dc.b <module1
dc.b <module2
dc.b <module3
dc.b <module4
dc.b <module5
dc.b <module6
dc.b <module7
dc.b <module8
dc.b <module9
dc.b <module10
dc.b <module11
dc.b <module12
dc.b <module13
moduleTblHi: dc.b >module0
dc.b >module1
dc.b >module2
dc.b >module3
dc.b >module4
dc.b >module5
dc.b >module6
dc.b >module7
dc.b >module8
dc.b >module9
dc.b >module10
dc.b >module11
dc.b >module12
dc.b >module13
subTuneModuleTbl:
dc.b 13
dc.b 1
dc.b 4
dc.b 5
dc.b 6
dc.b 7
dc.b 8
dc.b 9
dc.b 10
dc.b 11
dc.b 12
dc.b 4
dc.b 6
dc.b 7
dc.b 8
dc.b 9
dc.b 10
dc.b 11
dc.b 12
dc.b 0
dc.b 2
dc.b 3
subTuneTuneTbl: dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 1
dc.b 0
dc.b 0
module0: incbin music00.bin
module1: incbin music01.bin
module2: incbin music02.bin
module3: incbin music03.bin
module4: incbin music04.bin
module5: incbin music05.bin
module6: incbin music06.bin
module7: incbin music07.bin
module8: incbin music08.bin
module9: incbin music09.bin
module10: incbin music10.bin
module11: incbin music11.bin
module12: incbin music12.bin
module13: incbin loadermusic2.bin