spc.asm

arch SPC700
base SPC_ENGINE

;===================================================================================================

Engine_Start:
#_19FBCE: #_0800: clrp

#_19FBCF: #_0801: mov.b X, #$CF
#_19FBD1: #_0803: mov SP, X

#_19FBD2: #_0804: mov.b A, #$00
#_19FBD4: #_0806: mov X, A

.zeroing_loop_1
#_19FBD5: #_0807: mov (X+), A

#_19FBD6: #_0808: cmp.b X, #$E0
#_19FBD8: #_080A: bne .zeroing_loop_1

#_19FBDA: #_080C: mov.b X, #$00

.zeroing_loop_2
#_19FBDC: #_080E: mov.w $0200+X, A

#_19FBDF: #_0811: inc X
#_19FBE0: #_0812: bne .zeroing_loop_2

.zeroing_loop_3
#_19FBE2: #_0814: mov.w $0300+X, A

#_19FBE5: #_0817: inc X
#_19FBE6: #_0818: bne .zeroing_loop_3

; A = 1
#_19FBE8: #_081A: inc A
#_19FBE9: #_081B: call ConfigureEcho

#_19FBEC: #_081E: set5.b $48

#_19FBEE: #_0820: mov.b A, #$60
#_19FBF0: #_0822: mov.b Y, #MVOLL
#_19FBF2: #_0824: call WriteToDSP

#_19FBF5: #_0827: mov.b Y, #MVOLR
#_19FBF7: #_0829: call WriteToDSP

#_19FBFA: #_082C: mov.b A, #SAMPLE_POINTERS>>8
#_19FBFC: #_082E: mov.b Y, #DIR
#_19FBFE: #_0830: call WriteToDSP

; Set $FFC0 to ROM, clear ports 0123, stop timer 0
#_19FC01: #_0833: mov.b A, #$F0
#_19FC03: #_0835: mov.w CONTROL, A

#_19FC06: #_0838: mov.b A, #$10
#_19FC08: #_083A: mov.w T0DIV, A
#_19FC0B: #_083D: mov.b $53, A

; Start timer 0
#_19FC0D: #_083F: mov.b A, #$01
#_19FC0F: #_0841: mov.w CONTROL, A

;===================================================================================================

Engine_Main:
#_19FC12: #_0844: mov.b Y, #$0A

.next_register
#_19FC14: #_0846: cmp.b Y, #$05
#_19FC16: #_0848: beq .FLG_register
#_19FC18: #_084A: bcs .not_echo_register

#_19FC1A: #_084C: cmp.b $4C, $4D
#_19FC1D: #_084F: bne .skip

.FLG_register
#_19FC1F: #_0851: bbs7.b $4C, .skip

.not_echo_register
#_19FC22: #_0854: mov.w A, RegisterList-1+Y
#_19FC25: #_0857: mov.w DSPADDR, A

#_19FC28: #_085A: mov.w A, LoadValueFrom-1+Y
#_19FC2B: #_085D: mov X, A
#_19FC2C: #_085E: mov A, (X)
#_19FC2D: #_085F: mov.w DSPDATA, A

.skip
#_19FC30: #_0862: dbnz Y, .next_register

;---------------------------------------------------------------------------------------------------

#_19FC32: #_0864: mov.b $45, Y
#_19FC34: #_0866: mov.b $46, Y

#_19FC36: #_0868: mov.b A, $18
#_19FC38: #_086A: eor.b A, $19
#_19FC3A: #_086C: lsr A
#_19FC3B: #_086D: lsr A

#_19FC3C: #_086E: notc
#_19FC3D: #_086F: ror.b $18
#_19FC3F: #_0871: ror.b $19

.timer_wait
#_19FC41: #_0873: mov.w Y, T0OUT
#_19FC44: #_0876: beq .timer_wait

#_19FC46: #_0878: push Y

#_19FC47: #_0879: mov.b A, #$38
#_19FC49: #_087B: mul YA

#_19FC4A: #_087C: clrc
#_19FC4B: #_087D: adc.b A, $43
#_19FC4D: #_087F: mov.b $43, A
#_19FC4F: #_0881: bcc .wait_for_SFX

#_19FC51: #_0883: call Handle_SFX1
#_19FC54: #_0886: call HandleInput_SFX1

#_19FC57: #_0889: mov.b X, #$01
#_19FC59: #_088B: call Synchronize
#_19FC5C: #_088E: call Handle_SFX2
#_19FC5F: #_0891: call HandleInput_SFX2

#_19FC62: #_0894: mov.b X, #$02
#_19FC64: #_0896: call Synchronize
#_19FC67: #_0899: call Handle_SFX3
#_19FC6A: #_089C: call HandleInput_SFX3

#_19FC6D: #_089F: mov.b X, #$03
#_19FC6F: #_08A1: call Synchronize

#_19FC72: #_08A4: cmp.b $4C, $4D
#_19FC75: #_08A7: beq .wait_for_SFX

#_19FC77: #_08A9: inc.w $03C7
#_19FC7A: #_08AC: mov.w A, $03C7
#_19FC7D: #_08AF: lsr A
#_19FC7E: #_08B0: bcs .wait_for_SFX

#_19FC80: #_08B2: inc.b $4C

.wait_for_SFX
#_19FC82: #_08B4: mov.b A, $53

#_19FC84: #_08B6: pop Y
#_19FC85: #_08B7: mul YA

#_19FC86: #_08B8: clrc
#_19FC87: #_08B9: adc.b A, $51
#_19FC89: #_08BB: mov.b $51, A
#_19FC8B: #_08BD: bcc .ignore_tracker

#_19FC8D: #_08BF: call HandleInput_Song

#_19FC90: #_08C2: mov.b X, #$00
#_19FC92: #_08C4: call Synchronize

#_19FC95: #_08C7: jmp Engine_Main

;---------------------------------------------------------------------------------------------------

.ignore_tracker
#_19FC98: #_08CA: mov.b A, $04
#_19FC9A: #_08CC: beq .no_song

#_19FC9C: #_08CE: mov.b X, #$00
#_19FC9E: #_08D0: mov.b $47, #$01

.next_track
#_19FCA1: #_08D3: mov.b A, $31+X
#_19FCA3: #_08D5: beq .skip_voice

#_19FCA5: #_08D7: call BackgroundTasks

.skip_voice
#_19FCA8: #_08DA: inc X
#_19FCA9: #_08DB: inc X

#_19FCAA: #_08DC: asl.b $47
#_19FCAC: #_08DE: bne .next_track

.no_song
#_19FCAE: #_08E0: jmp Engine_Main

;===================================================================================================

Synchronize:
#_19FCB1: #_08E3: mov.b A, $04+X
#_19FCB3: #_08E5: mov.w CPUIO0+X, A

.wait
#_19FCB6: #_08E8: mov.w A, CPUIO0+X
#_19FCB9: #_08EB: cmp.w A, CPUIO0+X
#_19FCBC: #_08EE: bne .wait

#_19FCBE: #_08F0: mov Y, A
#_19FCBF: #_08F1: bne .dumb

.dumb
#_19FCC1: #_08F3: mov.b A, $08+X
#_19FCC3: #_08F5: mov.b $08+X, Y
#_19FCC5: #_08F7: cbne.b $08+X, .change

#_19FCC8: #_08FA: mov.b Y, #$00
#_19FCCA: #_08FC: mov.b $00+X, Y

#_19FCCC: #_08FE: ret

.change
#_19FCCD: #_08FF: mov.b $00+X, Y

.return
#_19FCCF: #_0901: ret

;===================================================================================================

HandleNote:
#_19FCD0: #_0902: cmp.b Y, #$CA ; check if percussion hit
#_19FCD2: #_0904: bcc .not_percussion

#_19FCD4: #_0906: call TrackCommand_E0_ChangeInstrument

#_19FCD7: #_0909: mov.b Y, #$A4 ; note C4

.not_percussion
#_19FCD9: #_090B: cmp.b Y, #$C8 ; check if tie
#_19FCDB: #_090D: bcs Synchronize_return

#_19FCDD: #_090F: mov.b A, $1A
#_19FCDF: #_0911: and.b A, $47
#_19FCE1: #_0913: bne Synchronize_return

#_19FCE3: #_0915: mov A, Y
#_19FCE4: #_0916: and.b A, #$7F

#_19FCE6: #_0918: clrc
#_19FCE7: #_0919: adc.b A, $50

#_19FCE9: #_091B: clrc
#_19FCEA: #_091C: adc.w A, $02F0+X
#_19FCED: #_091F: mov.w $0361+X, A

#_19FCF0: #_0922: mov.w A, $0381+X
#_19FCF3: #_0925: mov.w $0360+X, A

#_19FCF6: #_0928: mov.w A, $02B1+X
#_19FCF9: #_092B: lsr A

#_19FCFA: #_092C: mov.b A, #$00
#_19FCFC: #_092E: ror A
#_19FCFD: #_092F: mov.w $02A0+X, A

#_19FD00: #_0932: mov.b A, #$00
#_19FD02: #_0934: mov.b $B0+X, A
#_19FD04: #_0936: mov.w $0100+X, A
#_19FD07: #_0939: mov.w $02D0+X, A
#_19FD0A: #_093C: mov.b $C0+X, A

#_19FD0C: #_093E: or.b $5E, $47
#_19FD0F: #_0941: or.b $45, $47

#_19FD12: #_0944: mov.w A, $0280+X
#_19FD15: #_0947: mov.b $A0+X, A
#_19FD17: #_0949: beq .no_pitch_slide

#_19FD19: #_094B: mov.w A, $0281+X
#_19FD1C: #_094E: mov.b $A1+X, A

#_19FD1E: #_0950: mov.w A, $0290+X
#_19FD21: #_0953: bne .do_slide_to

#_19FD23: #_0955: mov.w A, $0361+X
#_19FD26: #_0958: setc
#_19FD27: #_0959: sbc.w A, $0291+X
#_19FD2A: #_095C: mov.w $0361+X, A

.do_slide_to
#_19FD2D: #_095F: mov.w A, $0291+X
#_19FD30: #_0962: clrc
#_19FD31: #_0963: adc.w A, $0361+X
#_19FD34: #_0966: call PitchSlide_calc_frames

.no_pitch_slide
#_19FD37: #_0969: call GetTempPitch

.external
#_19FD3A: #_096C: mov.b Y, #$00
#_19FD3C: #_096E: mov.b A, $11

#_19FD3E: #_0970: setc
#_19FD3F: #_0971: sbc.b A, #$34
#_19FD41: #_0973: bcs .high_note

#_19FD43: #_0975: mov.b A, $11
#_19FD45: #_0977: setc
#_19FD46: #_0978: sbc.b A, #$13
#_19FD48: #_097A: bcs .middle_note

#_19FD4A: #_097C: dec Y
#_19FD4B: #_097D: asl A

.high_note
#_19FD4C: #_097E: addw.b YA, $10
#_19FD4E: #_0980: movw.b $10, YA

.middle_note
#_19FD50: #_0982: push X

#_19FD51: #_0983: mov.b A, $11
#_19FD53: #_0985: asl A
#_19FD54: #_0986: mov.b Y, #$00
#_19FD56: #_0988: mov.b X, #$18

#_19FD58: #_098A: div YA, X
#_19FD59: #_098B: mov X, A
#_19FD5A: #_098C: mov.w A, TuningValues+1+Y
#_19FD5D: #_098F: mov.b $15, A

#_19FD5F: #_0991: mov.w A, TuningValues+0+Y
#_19FD62: #_0994: mov.b $14, A

#_19FD64: #_0996: mov.w A, TuningValues+3+Y
#_19FD67: #_0999: push A

#_19FD68: #_099A: mov.w A, TuningValues+2+Y

#_19FD6B: #_099D: pop Y
#_19FD6C: #_099E: subw.b YA, $14

#_19FD6E: #_09A0: mov.b Y, $10
#_19FD70: #_09A2: mul YA
#_19FD71: #_09A3: mov A, Y

#_19FD72: #_09A4: mov.b Y, #$00
#_19FD74: #_09A6: addw.b YA, $14

#_19FD76: #_09A8: mov.b $15, Y
#_19FD78: #_09AA: asl A
#_19FD79: #_09AB: rol.b $15
#_19FD7B: #_09AD: mov.b $14, A
#_19FD7D: #_09AF: bra .proceed

.pitch_loop
#_19FD7F: #_09B1: lsr.b $15
#_19FD81: #_09B3: ror A
#_19FD82: #_09B4: inc X

.proceed
#_19FD83: #_09B5: cmp.b X, #$06
#_19FD85: #_09B7: bne .pitch_loop

#_19FD87: #_09B9: mov.b $14, A

#_19FD89: #_09BB: pop X

#_19FD8A: #_09BC: mov.w A, $0220+X
#_19FD8D: #_09BF: mov.b Y, $15
#_19FD8F: #_09C1: mul YA
#_19FD90: #_09C2: movw.b $16, YA

#_19FD92: #_09C4: mov.w A, $0220+X
#_19FD95: #_09C7: mov.b Y, $14
#_19FD97: #_09C9: mul YA

#_19FD98: #_09CA: push Y

#_19FD99: #_09CB: mov.w A, $0221+X
#_19FD9C: #_09CE: mov.b Y, $14
#_19FD9E: #_09D0: mul YA
#_19FD9F: #_09D1: addw.b YA, $16

#_19FDA1: #_09D3: movw.b $16, YA
#_19FDA3: #_09D5: mov.w A, $0221+X
#_19FDA6: #_09D8: mov.b Y, $15
#_19FDA8: #_09DA: mul YA

#_19FDA9: #_09DB: mov Y, A
#_19FDAA: #_09DC: pop A
#_19FDAB: #_09DD: addw.b YA, $16
#_19FDAD: #_09DF: movw.b $16, YA

#_19FDAF: #_09E1: mov A, X
#_19FDB0: #_09E2: xcn A
#_19FDB1: #_09E3: lsr A
#_19FDB2: #_09E4: or.b A, #$02

#_19FDB4: #_09E6: mov Y, A
#_19FDB5: #_09E7: mov.b A, $16
#_19FDB7: #_09E9: call WriteToDSP_Checked

#_19FDBA: #_09EC: inc Y
#_19FDBB: #_09ED: mov.b A, $17

;===================================================================================================
; Writes value A to DSP register Y
; if the channel is enabled
;===================================================================================================
WriteToDSP_Checked:
#_19FDBD: #_09EF: push A
#_19FDBE: #_09F0: mov.b A, $47
#_19FDC0: #_09F2: and.b A, $1A

#_19FDC2: #_09F4: pop A
#_19FDC3: #_09F5: bne WriteToDSP_return

;===================================================================================================
; Writes value A to DSP register Y
;===================================================================================================
WriteToDSP:
#_19FDC5: #_09F7: mov.w DSPADDR, Y
#_19FDC8: #_09FA: mov.w DSPDATA, A

.return
#_19FDCB: #_09FD: ret

;===================================================================================================
; Mutes everything then prepares for transfer
;===================================================================================================
SongCommand_FF_TransferData:
#_19FDCC: #_09FE: mov.b A, #$00
#_19FDCE: #_0A00: mov.b Y, #EVOLL
#_19FDD0: #_0A02: call WriteToDSP

#_19FDD3: #_0A05: mov.b A, #$00
#_19FDD5: #_0A07: mov.b Y, #EVOLR
#_19FDD7: #_0A09: call WriteToDSP

#_19FDDA: #_0A0C: mov.b A, #$FF
#_19FDDC: #_0A0E: mov.b Y, #KOFF

#_19FDDE: #_0A10: call WriteToDSP
#_19FDE1: #_0A13: call Data_Loader

#_19FDE4: #_0A16: mov.b A, #$00
#_19FDE6: #_0A18: mov.w $03CA, A
#_19FDE9: #_0A1B: mov.b $04, A
#_19FDEB: #_0A1D: mov.w $03CF, A
#_19FDEE: #_0A20: mov.w $03CB, A
#_19FDF1: #_0A23: mov.w $03CD, A
#_19FDF4: #_0A26: mov.b $1A, A

#_19FDF6: #_0A28: ret

;===================================================================================================

SongCommand_F1_Fadeout:
#_19FDF7: #_0A29: mov.b X, #$80
#_19FDF9: #_0A2B: mov.b $5A, X
#_19FDFB: #_0A2D: mov.w $03CA, X

#_19FDFE: #_0A30: mov.b A, #$00
#_19FE00: #_0A32: mov.b $5B, A

#_19FE02: #_0A34: setc
#_19FE03: #_0A35: sbc.b A, $59
#_19FE05: #_0A37: call MakeFraction
#_19FE08: #_0A3A: movw.b $5C, YA

#_19FE0A: #_0A3C: jmp HandleInput_Song_no_new_song

;===================================================================================================

SongCommand_F2_HalfVolume:
#_19FE0D: #_0A3F: mov.w A, $03E1
#_19FE10: #_0A42: bne SongCommand_F3_MaxVolume_return


#_19FE12: #_0A44: mov.b A, $59
#_19FE14: #_0A46: mov.w $03E1, A

#_19FE17: #_0A49: mov.b A, #$70
#_19FE19: #_0A4B: mov.b $59, A

#_19FE1B: #_0A4D: jmp HandleInput_Song_no_new_song

;===================================================================================================

SongCommand_F3_MaxVolume:
#_19FE1E: #_0A50: mov.w A, $03E1
#_19FE21: #_0A53: beq .return

#_19FE23: #_0A55: mov.w A, $03E1
#_19FE26: #_0A58: mov.b $59, A

#_19FE28: #_0A5A: mov.b A, #$00
#_19FE2A: #_0A5C: mov.w $03E1, A

#_19FE2D: #_0A5F: jmp HandleInput_Song_no_new_song

.return
#_19FE30: #_0A62: ret

;===================================================================================================

Song_Commands:
#_19FE31: #_0A63: cmp.b A, #$FF ; SONG FF - transfer
#_19FE33: #_0A65: beq SongCommand_FF_TransferData

#_19FE35: #_0A67: cmp.b A, #$F1 ; SONG F1 - fade
#_19FE37: #_0A69: beq SongCommand_F1_Fadeout

#_19FE39: #_0A6B: cmp.b A, #$F2 ; SONG F2 - half volume
#_19FE3B: #_0A6D: beq SongCommand_F2_HalfVolume

#_19FE3D: #_0A6F: cmp.b A, #$F3 ; SONG F3 - max volume
#_19FE3F: #_0A71: beq SongCommand_F3_MaxVolume

#_19FE41: #_0A73: cmp.b A, #$F0 ; SONG F0 - mute
#_19FE43: #_0A75: beq SongCommand_F0_Mute

#_19FE45: #_0A77: bra Song_NewJam

;===================================================================================================

PerformFadeout:
#_19FE47: #_0A79: dec.w $03CA
#_19FE4A: #_0A7C: beq SongCommand_F0_Mute

#_19FE4C: #_0A7E: jmp HandleInput_Song_dont_fade_out

;===================================================================================================

SongCommand_F0_Mute:
#_19FE4F: #_0A81: mov.b A, $1A
#_19FE51: #_0A83: eor.b A, #$FF
#_19FE53: #_0A85: tset.w $0046, A

#_19FE56: #_0A88: mov.b $04, #$00
#_19FE59: #_0A8B: mov.b $47, #$00

#_19FE5C: #_0A8E: ret

;===================================================================================================

GetNextPart:
#_19FE5D: #_0A8F: mov.b Y, #$00
#_19FE5F: #_0A91: mov.b A, ($40)+Y
#_19FE61: #_0A93: incw.b $40

#_19FE63: #_0A95: push A
#_19FE64: #_0A96: mov.b A, ($40)+Y
#_19FE66: #_0A98: incw.b $40

#_19FE68: #_0A9A: mov Y, A
#_19FE69: #_0A9B: pop A

#_19FE6A: #_0A9C: ret

;===================================================================================================
; Drops a new track
;===================================================================================================
Song_NewJam:
#_19FE6B: #_0A9D: clrc

#_19FE6C: #_0A9E: mov.b X, #$00
#_19FE6E: #_0AA0: mov.w $03CA, X
#_19FE71: #_0AA3: mov.w $03E1, X

#_19FE74: #_0AA6: mov.b $04, A

#_19FE76: #_0AA8: asl A
#_19FE77: #_0AA9: mov X, A
#_19FE78: #_0AAA: mov.w A, SONG_POINTERS-1+X

#_19FE7B: #_0AAD: mov Y, A
#_19FE7C: #_0AAE: mov.w A, SONG_POINTERS-2+X

#_19FE7F: #_0AB1: movw.b $40, YA
#_19FE81: #_0AB3: mov.b $0C, #$02

.key_off
#_19FE84: #_0AB6: mov.b A, $1A
#_19FE86: #_0AB8: eor.b A, #$FF
#_19FE88: #_0ABA: tset.w $0046, A

#_19FE8B: #_0ABD: ret

;===================================================================================================

EngineStartDelay:
#_19FE8C: #_0ABE: mov.b X, #$0E
#_19FE8E: #_0AC0: mov.b $47, #$80

.next_channel
#_19FE91: #_0AC3: mov.b A, #$FF
#_19FE93: #_0AC5: mov.w $0301+X, A

#_19FE96: #_0AC8: mov.b A, #$0A
#_19FE98: #_0ACA: call TrackCommand_E1_ChangePan

#_19FE9B: #_0ACD: mov.w $0211+X, A
#_19FE9E: #_0AD0: mov.w $0381+X, A
#_19FEA1: #_0AD3: mov.w $02F0+X, A
#_19FEA4: #_0AD6: mov.w $0280+X, A
#_19FEA7: #_0AD9: mov.w $03FF+X, A

#_19FEAA: #_0ADC: mov.b $B1+X, A
#_19FEAC: #_0ADE: mov.b $C1+X, A

#_19FEAE: #_0AE0: dec X
#_19FEAF: #_0AE1: dec X

#_19FEB0: #_0AE2: lsr.b $47
#_19FEB2: #_0AE4: bne .next_channel

#_19FEB4: #_0AE6: mov.b $5A, A
#_19FEB6: #_0AE8: mov.b $68, A
#_19FEB8: #_0AEA: mov.b $54, A
#_19FEBA: #_0AEC: mov.b $50, A
#_19FEBC: #_0AEE: mov.b $42, A
#_19FEBE: #_0AF0: mov.b $5F, A

#_19FEC0: #_0AF2: mov.b $59, #$C0
#_19FEC3: #_0AF5: mov.b $53, #$20

.return
#_19FEC6: #_0AF8: ret

;===================================================================================================

HandleInput_Song:
#_19FEC7: #_0AF9: mov.b A, $00
#_19FEC9: #_0AFB: beq .no_new_song

#_19FECB: #_0AFD: jmp Song_Commands

.no_new_song
#_19FECE: #_0B00: mov.b A, $04
#_19FED0: #_0B02: beq EngineStartDelay_return

#_19FED2: #_0B04: mov.w A, $03CA
#_19FED5: #_0B07: beq .dont_fade_out

#_19FED7: #_0B09: jmp PerformFadeout

.dont_fade_out
#_19FEDA: #_0B0C: mov.b A, $0C
#_19FEDC: #_0B0E: beq .no_delay

#_19FEDE: #_0B10: dbnz.b $0C, EngineStartDelay

;---------------------------------------------------------------------------------------------------

.loop
#_19FEE1: #_0B13: call GetNextPart
#_19FEE4: #_0B16: bne .valid_pointer

#_19FEE6: #_0B18: mov Y, A
#_19FEE7: #_0B19: bne .valid_command

#_19FEE9: #_0B1B: jmp SongCommand_F0_Mute

.valid_command
#_19FEEC: #_0B1E: cmp.b A, #$80
#_19FEEE: #_0B20: beq .disable_d_s_p

#_19FEF0: #_0B22: cmp.b A, #$81
#_19FEF2: #_0B24: bne .set_num_loops

#_19FEF4: #_0B26: mov.b A, #$00

.disable_d_s_p
#_19FEF6: #_0B28: mov.b $1B, A
#_19FEF8: #_0B2A: bra .loop

.set_num_loops
#_19FEFA: #_0B2C: dec.b $42
#_19FEFC: #_0B2E: bpl .loop_in_progress

#_19FEFE: #_0B30: mov.b $42, A

.loop_in_progress
#_19FF00: #_0B32: call GetNextPart

#_19FF03: #_0B35: mov.b X, $42
#_19FF05: #_0B37: beq .loop

#_19FF07: #_0B39: movw.b $40, YA
#_19FF09: #_0B3B: bra .loop

.valid_pointer
#_19FF0B: #_0B3D: movw.b $16, YA
#_19FF0D: #_0B3F: mov.b Y, #$0F

.load_pattern_table_loop
#_19FF0F: #_0B41: mov.b A, ($16)+Y
#_19FF11: #_0B43: mov.w $0030+Y, A

#_19FF14: #_0B46: dec Y
#_19FF15: #_0B47: bpl .load_pattern_table_loop

#_19FF17: #_0B49: mov.b X, #$00
#_19FF19: #_0B4B: mov.b $47, #$01

.next_channel
#_19FF1C: #_0B4E: mov.b A, $31+X
#_19FF1E: #_0B50: beq .valid_track_pointer

#_19FF20: #_0B52: mov.w A, $0211+X
#_19FF23: #_0B55: bne .valid_track_pointer

#_19FF25: #_0B57: mov.b A, #$00
#_19FF27: #_0B59: call TrackCommand_E0_ChangeInstrument

.valid_track_pointer
#_19FF2A: #_0B5C: mov.b A, #$00
#_19FF2C: #_0B5E: mov.b $80+X, A
#_19FF2E: #_0B60: mov.b $90+X, A
#_19FF30: #_0B62: mov.b $91+X, A

#_19FF32: #_0B64: inc A
#_19FF33: #_0B65: mov.b $70+X, A

#_19FF35: #_0B67: inc X
#_19FF36: #_0B68: inc X

#_19FF37: #_0B69: asl.b $47
#_19FF39: #_0B6B: bne .next_channel

;---------------------------------------------------------------------------------------------------

.no_delay
#_19FF3B: #_0B6D: mov.b X, #$00
#_19FF3D: #_0B6F: mov.b $5E, X
#_19FF3F: #_0B71: mov.b $47, #$01

.loop_2
#_19FF42: #_0B74: mov.b $44, X
#_19FF44: #_0B76: mov.b A, $31+X
#_19FF46: #_0B78: beq .next_channel_2

#_19FF48: #_0B7A: dec.b $70+X
#_19FF4A: #_0B7C: bne .empty_track

.try_again
#_19FF4C: #_0B7E: call GetTrackByte
#_19FF4F: #_0B81: bne .non_terminating

#_19FF51: #_0B83: mov.b A, $80+X
#_19FF53: #_0B85: beq .loop

#_19FF55: #_0B87: call IteratePartLoop

#_19FF58: #_0B8A: dec.b $80+X
#_19FF5A: #_0B8C: bne .try_again

#_19FF5C: #_0B8E: mov.w A, $0230+X
#_19FF5F: #_0B91: mov.b $30+X, A

#_19FF61: #_0B93: mov.w A, $0231+X
#_19FF64: #_0B96: mov.b $31+X, A

#_19FF66: #_0B98: bra .try_again

;---------------------------------------------------------------------------------------------------

.non_terminating
#_19FF68: #_0B9A: bmi .note_or_command

#_19FF6A: #_0B9C: mov.w $0200+X, A

#_19FF6D: #_0B9F: call GetTrackByte
#_19FF70: #_0BA2: bmi .note_or_command

#_19FF72: #_0BA4: push A

#_19FF73: #_0BA5: xcn A
#_19FF74: #_0BA6: and.b A, #$07
#_19FF76: #_0BA8: mov Y, A
#_19FF77: #_0BA9: mov.w A, NoteStacc+Y
#_19FF7A: #_0BAC: mov.w $0201+X, A

#_19FF7D: #_0BAF: pop A
#_19FF7E: #_0BB0: and.b A, #$0F
#_19FF80: #_0BB2: mov Y, A
#_19FF81: #_0BB3: mov.w A, NoteAttack+Y
#_19FF84: #_0BB6: mov.w $0210+X, A

#_19FF87: #_0BB9: call GetTrackByte

.note_or_command
#_19FF8A: #_0BBC: cmp.b A, #$E0 ; instrument change
#_19FF8C: #_0BBE: bcc .note

#_19FF8E: #_0BC0: call ExecuteCommand
#_19FF91: #_0BC3: bra .try_again

.note
#_19FF93: #_0BC5: mov.w A, $03FF+X
#_19FF96: #_0BC8: or.b A, $1B
#_19FF98: #_0BCA: bne .disabled_channel
#_19FF9A: #_0BCC: mov A, Y

#_19FF9B: #_0BCD: push A

#_19FF9C: #_0BCE: mov.b A, $47
#_19FF9E: #_0BD0: and.b A, $1A

#_19FFA0: #_0BD2: pop A

#_19FFA1: #_0BD3: bne .disabled_channel

#_19FFA3: #_0BD5: call HandleNote

.disabled_channel
#_19FFA6: #_0BD8: mov.w A, $0200+X
#_19FFA9: #_0BDB: mov.b $70+X, A

#_19FFAB: #_0BDD: mov Y, A
#_19FFAC: #_0BDE: mov.w A, $0201+X
#_19FFAF: #_0BE1: mul YA
#_19FFB0: #_0BE2: mov A, Y
#_19FFB1: #_0BE3: bne .non_zero

#_19FFB3: #_0BE5: inc A

.non_zero
#_19FFB4: #_0BE6: mov.b $71+X, A
#_19FFB6: #_0BE8: bra .continue

.empty_track
#_19FFB8: #_0BEA: mov.b A, $1B
#_19FFBA: #_0BEC: bne .next_channel_2

#_19FFBC: #_0BEE: call Tracker

.continue
#_19FFBF: #_0BF1: call PitchSlide

.next_channel_2
#_19FFC2: #_0BF4: inc X
#_19FFC3: #_0BF5: inc X
#_19FFC4: #_0BF6: asl.b $47
#_19FFC6: #_0BF8: beq .done_with_channels

#_19FFC8: #_0BFA: jmp .loop_2

;---------------------------------------------------------------------------------------------------

.done_with_channels
#_19FFCB: #_0BFD: mov.b A, $54
#_19FFCD: #_0BFF: beq .no_tempo_slide

#_19FFCF: #_0C01: movw.b YA, $56
#_19FFD1: #_0C03: addw.b YA, $52
#_19FFD3: #_0C05: dbnz.b $54, .temp_slide_not_done

#_19FFD6: #_0C08: movw.b YA, $54

.temp_slide_not_done
#_19FFD8: #_0C0A: movw.b $52, YA

.no_tempo_slide
#_19FFDA: #_0C0C: mov.b A, $68
#_19FFDC: #_0C0E: beq .no_echo_pan_slide

#_19FFDE: #_0C10: movw.b YA, $64
#_19FFE0: #_0C12: addw.b YA, $60
#_19FFE2: #_0C14: movw.b $60, YA

#_19FFE4: #_0C16: movw.b YA, $66
#_19FFE6: #_0C18: addw.b YA, $62
#_19FFE8: #_0C1A: dbnz.b $68, .pan_slide_not_done

#_19FFEB: #_0C1D: movw.b YA, $68
#_19FFED: #_0C1F: movw.b $60, YA
#_19FFEF: #_0C21: mov.b Y, $6A

.pan_slide_not_done
#_19FFF1: #_0C23: movw.b $62, YA

.no_echo_pan_slide
#_19FFF3: #_0C25: mov.b A, $5A
#_19FFF5: #_0C27: beq .no_volume_slide

#_19FFF7: #_0C29: movw.b YA, $5C
#_19FFF9: #_0C2B: addw.b YA, $58
#_19FFFB: #_0C2D: dbnz.b $5A, .volume_slide_not_done

#_19FFFE: #_0C30: movw.b YA, $5A

.volume_slide_not_done
#_1A8000: #_0C32: movw.b $58, YA
#_1A8002: #_0C34: mov.b $5E, #$FF

.no_volume_slide
#_1A8005: #_0C37: mov.b X, #$00
#_1A8007: #_0C39: mov.b $47, #$01

.volume_settings_loop
#_1A800A: #_0C3C: mov.b A, $31+X
#_1A800C: #_0C3E: beq .inactive_track

#_1A800E: #_0C40: call WritePitch

.inactive_track
#_1A8011: #_0C43: inc X
#_1A8012: #_0C44: inc X

#_1A8013: #_0C45: asl.b $47
#_1A8015: #_0C47: bne .volume_settings_loop

#_1A8017: #_0C49: ret

;===================================================================================================

ExecuteCommand:
#_1A8018: #_0C4A: asl A
#_1A8019: #_0C4B: mov Y, A

#_1A801A: #_0C4C: mov.w A, TrackCommand_Vectors+1-$C0+Y
#_1A801D: #_0C4F: push A
#_1A801E: #_0C50: mov.w A, TrackCommand_Vectors+0-$C0+Y
#_1A8021: #_0C53: push A

#_1A8022: #_0C54: mov A, Y
#_1A8023: #_0C55: lsr A
#_1A8024: #_0C56: mov Y, A

#_1A8025: #_0C57: mov.w A, TrackCommandParamCount-$60+Y
#_1A8028: #_0C5A: beq NoParameters

;===================================================================================================

GetTrackByte:
#_1A802A: #_0C5C: mov.b A, ($30+X)

;===================================================================================================

SkipTrackByte:
#_1A802C: #_0C5E: inc.b $30+X
#_1A802E: #_0C60: bne NoParameters

#_1A8030: #_0C62: inc.b $31+X

;===================================================================================================

NoParameters:
#_1A8032: #_0C64: mov Y, A

#_1A8033: #_0C65: ret

;===================================================================================================

TrackCommand_E0_ChangeInstrument:
#_1A8034: #_0C66: mov.w $0211+X, A

#_1A8037: #_0C69: mov Y, A
#_1A8038: #_0C6A: bpl .no_percussion

#_1A803A: #_0C6C: setc
#_1A803B: #_0C6D: sbc.b A, #$CA ; Percussion base
#_1A803D: #_0C6F: clrc
#_1A803E: #_0C70: adc.b A, $5F

.no_percussion
#_1A8040: #_0C72: mov.b Y, #$06
#_1A8042: #_0C74: mul YA
#_1A8043: #_0C75: movw.b $14, YA

#_1A8045: #_0C77: clrc
#_1A8046: #_0C78: adc.b $14, #INSTRUMENT_DATA>>0
#_1A8049: #_0C7B: adc.b $15, #INSTRUMENT_DATA>>8

#_1A804C: #_0C7E: mov.b A, $1A
#_1A804E: #_0C80: and.b A, $47
#_1A8050: #_0C82: bne .return

#_1A8052: #_0C84: push X

#_1A8053: #_0C85: mov A, X
#_1A8054: #_0C86: xcn A
#_1A8055: #_0C87: lsr A
#_1A8056: #_0C88: or.b A, #$04
#_1A8058: #_0C8A: mov X, A

#_1A8059: #_0C8B: mov.b Y, #$00
#_1A805B: #_0C8D: mov.b A, ($14)+Y
#_1A805D: #_0C8F: bpl .normal_sample

#_1A805F: #_0C91: and.b A, #$1F
#_1A8061: #_0C93: and.b $48, #$20
#_1A8064: #_0C96: tset.w $0048, A
#_1A8067: #_0C99: or.b ($49), ($47)

#_1A806A: #_0C9C: mov A, Y
#_1A806B: #_0C9D: bra .resume

.normal_sample
#_1A806D: #_0C9F: mov.b A, $47
#_1A806F: #_0CA1: tclr.w $0049, A

.dsp_write_loop
#_1A8072: #_0CA4: mov.b A, ($14)+Y

.resume
#_1A8074: #_0CA6: mov.w DSPADDR, X
#_1A8077: #_0CA9: mov.w DSPDATA, A

#_1A807A: #_0CAC: inc X
#_1A807B: #_0CAD: inc Y

#_1A807C: #_0CAE: cmp.b Y, #$04
#_1A807E: #_0CB0: bne .dsp_write_loop

#_1A8080: #_0CB2: pop X

#_1A8081: #_0CB3: mov.b A, ($14)+Y
#_1A8083: #_0CB5: mov.w $0221+X, A

#_1A8086: #_0CB8: inc Y
#_1A8087: #_0CB9: mov.b A, ($14)+Y
#_1A8089: #_0CBB: mov.w $0220+X, A

.return
#_1A808C: #_0CBE: ret

;===================================================================================================

TrackCommand_E1_ChangePan:
#_1A808D: #_0CBF: mov.w $0351+X, A

#_1A8090: #_0CC2: and.b A, #$1F
#_1A8092: #_0CC4: mov.w $0331+X, A

#_1A8095: #_0CC7: mov.b A, #$00
#_1A8097: #_0CC9: mov.w $0330+X, A

#_1A809A: #_0CCC: ret

;===================================================================================================

TrackCommand_E2_PanSlide:
#_1A809B: #_0CCD: mov.b $91+X, A

#_1A809D: #_0CCF: push A
#_1A809E: #_0CD0: call GetTrackByte

#_1A80A1: #_0CD3: mov.w $0350+X, A
#_1A80A4: #_0CD6: setc
#_1A80A5: #_0CD7: sbc.w A, $0331+X

#_1A80A8: #_0CDA: pop X
#_1A80A9: #_0CDB: call MakeFraction

#_1A80AC: #_0CDE: mov.w $0340+X, A
#_1A80AF: #_0CE1: mov A, Y
#_1A80B0: #_0CE2: mov.w $0341+X, A

#_1A80B3: #_0CE5: ret

;===================================================================================================

TrackCommand_E3_SetVibrato:
#_1A80B4: #_0CE6: mov.w $02B0+X, A

#_1A80B7: #_0CE9: call GetTrackByte
#_1A80BA: #_0CEC: mov.w $02A1+X, A

#_1A80BD: #_0CEF: call GetTrackByte

;===================================================================================================

TrackCommand_E4_VibratoOff:
#_1A80C0: #_0CF2: mov.b $B1+X, A
#_1A80C2: #_0CF4: mov.w $02C1+X, A

#_1A80C5: #_0CF7: mov.b A, #$00
#_1A80C7: #_0CF9: mov.w $02B1+X, A

#_1A80CA: #_0CFC: ret

;===================================================================================================

TrackCommand_F0_VibratoGradient:
#_1A80CB: #_0CFD: mov.w $02B1+X, A
#_1A80CE: #_0D00: push A

#_1A80CF: #_0D01: mov.b Y, #$00
#_1A80D1: #_0D03: mov.b A, $B1+X

#_1A80D3: #_0D05: pop X

#_1A80D4: #_0D06: div YA, X
#_1A80D5: #_0D07: mov.b X, $44
#_1A80D7: #_0D09: mov.w $02C0+X, A

#_1A80DA: #_0D0C: ret

;===================================================================================================

TrackCommand_E5_GlobalVolume:
#_1A80DB: #_0D0D: mov.w A, $03CA
#_1A80DE: #_0D10: bne .return

#_1A80E0: #_0D12: mov.w A, $03E1
#_1A80E3: #_0D15: bne .return

#_1A80E5: #_0D17: mov.b A, #$00
#_1A80E7: #_0D19: movw.b $58, YA

.return
#_1A80E9: #_0D1B: ret

;===================================================================================================

TrackCommand_E6_GlobalVolumeSlide:
#_1A80EA: #_0D1C: mov.b $5A, A

#_1A80EC: #_0D1E: call GetTrackByte
#_1A80EF: #_0D21: mov.b $5B, A

#_1A80F1: #_0D23: setc
#_1A80F2: #_0D24: sbc.b A, $59
#_1A80F4: #_0D26: mov.b X, $5A
#_1A80F6: #_0D28: call MakeFraction

#_1A80F9: #_0D2B: movw.b $5C, YA

#_1A80FB: #_0D2D: ret

;===================================================================================================

TrackCommand_E7_SetTempo:
#_1A80FC: #_0D2E: mov.b A, #$00
#_1A80FE: #_0D30: movw.b $52, YA

#_1A8100: #_0D32: ret

;===================================================================================================

TrackCommand_E8_TempoSlide:
#_1A8101: #_0D33: mov.b $54, A

#_1A8103: #_0D35: call GetTrackByte
#_1A8106: #_0D38: mov.b $55, A

#_1A8108: #_0D3A: setc
#_1A8109: #_0D3B: sbc.b A, $53
#_1A810B: #_0D3D: mov.b X, $54
#_1A810D: #_0D3F: call MakeFraction

#_1A8110: #_0D42: movw.b $56, YA

#_1A8112: #_0D44: ret

;===================================================================================================

TrackCommand_E9_GlobalTranspose:
#_1A8113: #_0D45: mov.b $50, A

#_1A8115: #_0D47: ret

;===================================================================================================

TrackCommand_EA_ChannelTranspose:
#_1A8116: #_0D48: mov.w $02F0+X, A

#_1A8119: #_0D4B: ret

;===================================================================================================

TrackCommand_EB_SetTremelo:
#_1A811A: #_0D4C: mov.w $02E0+X, A

#_1A811D: #_0D4F: call GetTrackByte
#_1A8120: #_0D52: mov.w $02D1+X, A

#_1A8123: #_0D55: call GetTrackByte

;===================================================================================================

TrackCommand_EC_TremeloOff:
#_1A8126: #_0D58: mov.b $C1+X, A

#_1A8128: #_0D5A: ret

;===================================================================================================

TrackCommand_F1_PitchSlideTo:
#_1A8129: #_0D5B: mov.b A, #$01

#_1A812B: #_0D5D: bra TrackCommand_F2_PitchSlideFrom_start

;===================================================================================================

TrackCommand_F2_PitchSlideFrom:
#_1A812D: #_0D5F: mov.b A, #$00

.start
#_1A812F: #_0D61: mov.w $0290+X, A

#_1A8132: #_0D64: mov A, Y
#_1A8133: #_0D65: mov.w $0281+X, A

#_1A8136: #_0D68: call GetTrackByte
#_1A8139: #_0D6B: mov.w $0280+X, A

#_1A813C: #_0D6E: call GetTrackByte
#_1A813F: #_0D71: mov.w $0291+X, A

#_1A8142: #_0D74: ret

;===================================================================================================

TrackCommand_F3_PitchSlideStop:
#_1A8143: #_0D75: mov.w $0280+X, A

#_1A8146: #_0D78: ret

;===================================================================================================

TrackCommand_ED_ChannelVolume:
#_1A8147: #_0D79: mov.w $0301+X, A

#_1A814A: #_0D7C: mov.b A, #$00
#_1A814C: #_0D7E: mov.w $0300+X, A

#_1A814F: #_0D81: ret

;===================================================================================================

TrackCommand_EE_ChannelVolumeSlide:
#_1A8150: #_0D82: mov.b $90+X, A
#_1A8152: #_0D84: push A

#_1A8153: #_0D85: call GetTrackByte
#_1A8156: #_0D88: mov.w $0320+X, A

#_1A8159: #_0D8B: setc
#_1A815A: #_0D8C: sbc.w A, $0301+X

#_1A815D: #_0D8F: pop X

#_1A815E: #_0D90: call MakeFraction
#_1A8161: #_0D93: mov.w $0310+X, A

#_1A8164: #_0D96: mov A, Y
#_1A8165: #_0D97: mov.w $0311+X, A

#_1A8168: #_0D9A: ret

;===================================================================================================

TrackCommand_F4_FineTuning:
#_1A8169: #_0D9B: mov.w $0381+X, A

#_1A816C: #_0D9E: ret

;===================================================================================================

TrackCommand_EF_CallPart:
#_1A816D: #_0D9F: mov.w $0240+X, A

#_1A8170: #_0DA2: call GetTrackByte
#_1A8173: #_0DA5: mov.w $0241+X, A

#_1A8176: #_0DA8: call GetTrackByte
#_1A8179: #_0DAB: mov.b $80+X, A

#_1A817B: #_0DAD: mov.b A, $30+X
#_1A817D: #_0DAF: mov.w $0230+X, A

#_1A8180: #_0DB2: mov.b A, $31+X
#_1A8182: #_0DB4: mov.w $0231+X, A

;===================================================================================================

IteratePartLoop:
#_1A8185: #_0DB7: mov.w A, $0240+X
#_1A8188: #_0DBA: mov.b $30+X, A

#_1A818A: #_0DBC: mov.w A, $0241+X
#_1A818D: #_0DBF: mov.b $31+X, A

#_1A818F: #_0DC1: ret

;===================================================================================================

TrackCommand_F5_EchoBasicControl:
#_1A8190: #_0DC2: mov.w $03C3, A
#_1A8193: #_0DC5: mov.b $4A, A

#_1A8195: #_0DC7: call GetTrackByte
#_1A8198: #_0DCA: mov.b A, #$00
#_1A819A: #_0DCC: movw.b $60, YA

#_1A819C: #_0DCE: call GetTrackByte
#_1A819F: #_0DD1: mov.b A, #$00
#_1A81A1: #_0DD3: movw.b $62, YA

#_1A81A3: #_0DD5: clr5.b $48

#_1A81A5: #_0DD7: ret

;===================================================================================================

TrackCommand_F8_EchoSlide:
#_1A81A6: #_0DD8: mov.b $68, A

#_1A81A8: #_0DDA: call GetTrackByte
#_1A81AB: #_0DDD: mov.b $69, A

#_1A81AD: #_0DDF: setc
#_1A81AE: #_0DE0: sbc.b A, $61
#_1A81B0: #_0DE2: mov.b X, $68

#_1A81B2: #_0DE4: call MakeFraction
#_1A81B5: #_0DE7: movw.b $64, YA

#_1A81B7: #_0DE9: call GetTrackByte
#_1A81BA: #_0DEC: mov.b $6A, A

#_1A81BC: #_0DEE: setc
#_1A81BD: #_0DEF: sbc.b A, $63
#_1A81BF: #_0DF1: mov.b X, $68

#_1A81C1: #_0DF3: call MakeFraction
#_1A81C4: #_0DF6: movw.b $66, YA

#_1A81C6: #_0DF8: ret

;===================================================================================================

TrackCommand_F6_EchoSilence:
#_1A81C7: #_0DF9: movw.b $60, YA
#_1A81C9: #_0DFB: movw.b $62, YA

#_1A81CB: #_0DFD: set5.b $48

#_1A81CD: #_0DFF: ret

;===================================================================================================

TrackCommand_F7_EchoFilter:
#_1A81CE: #_0E00: call ConfigureEcho

#_1A81D1: #_0E03: call GetTrackByte
#_1A81D4: #_0E06: mov.b $4E, A

#_1A81D6: #_0E08: call GetTrackByte
#_1A81D9: #_0E0B: mov.b Y, #$08
#_1A81DB: #_0E0D: mul YA
#_1A81DC: #_0E0E: mov X, A
#_1A81DD: #_0E0F: mov.b Y, #FIR0

.set_next_filter
#_1A81DF: #_0E11: mov.w A, EchoFilterParameters+X
#_1A81E2: #_0E14: call WriteToDSP

#_1A81E5: #_0E17: inc X

#_1A81E6: #_0E18: mov A, Y
#_1A81E7: #_0E19: clrc
#_1A81E8: #_0E1A: adc.b A, #$10
#_1A81EA: #_0E1C: mov Y, A

#_1A81EB: #_0E1D: bpl .set_next_filter

#_1A81ED: #_0E1F: mov.b X, $44

#_1A81EF: #_0E21: ret

;===================================================================================================

ConfigureEcho:
#_1A81F0: #_0E22: mov.b $4D, A
#_1A81F2: #_0E24: mov.b Y, #EDL

#_1A81F4: #_0E26: mov.w DSPADDR, Y
#_1A81F7: #_0E29: mov.w A, DSPDATA

#_1A81FA: #_0E2C: cmp.b A, $4D
#_1A81FC: #_0E2E: beq .edl_same

#_1A81FE: #_0E30: and.b A, #$0F
#_1A8200: #_0E32: eor.b A, #$FF
#_1A8202: #_0E34: bbc7.b $4C, .buffer_ready

#_1A8205: #_0E37: clrc
#_1A8206: #_0E38: adc.b A, $4C

.buffer_ready
#_1A8208: #_0E3A: mov.b $4C, A
#_1A820A: #_0E3C: mov.b Y, #$04

.write_register
#_1A820C: #_0E3E: mov.w A, RegisterList-1+Y
#_1A820F: #_0E41: mov.w DSPADDR, A

#_1A8212: #_0E44: mov.b A, #$00
#_1A8214: #_0E46: mov.w DSPDATA, A

#_1A8217: #_0E49: dbnz Y, .write_register

#_1A8219: #_0E4B: mov.b A, $48
#_1A821B: #_0E4D: or.b A, #$20
#_1A821D: #_0E4F: mov.b Y, #FLG
#_1A821F: #_0E51: call WriteToDSP

#_1A8222: #_0E54: mov.b A, $4D
#_1A8224: #_0E56: mov.b Y, #EDL
#_1A8226: #_0E58: call WriteToDSP

.edl_same
#_1A8229: #_0E5B: asl A
#_1A822A: #_0E5C: asl A
#_1A822B: #_0E5D: asl A
#_1A822C: #_0E5E: eor.b A, #$FF
#_1A822E: #_0E60: setc
#_1A822F: #_0E61: adc.b A, #SONG_POINTERS>>8
#_1A8231: #_0E63: mov.b Y, #ESA

#_1A8233: #_0E65: jmp WriteToDSP

;===================================================================================================

TrackCommand_FA_PercussionOffset:
#_1A8236: #_0E68: mov.b $5F, A

#_1A8238: #_0E6A: ret

;===================================================================================================

DummyCommand:
#_1A8239: #_0E6B: call SkipTrackByte

#_1A823C: #_0E6E: ret

;===================================================================================================

ChannelStop:
#_1A823D: #_0E6F: inc A
#_1A823E: #_0E70: mov.w $03FF+X, A

#_1A8241: #_0E73: ret

;===================================================================================================

SongStop:
#_1A8242: #_0E74: inc A

;===================================================================================================

SongContinue:
#_1A8243: #_0E75: mov.b $1B, A

#_1A8245: #_0E77: jmp Song_NewJam_key_off

;===================================================================================================

PitchSlide:
#_1A8248: #_0E7A: mov.b A, $A0+X
#_1A824A: #_0E7C: bne .return

#_1A824C: #_0E7E: mov.b A, ($30+X)
#_1A824E: #_0E80: cmp.b A, #$F9
#_1A8250: #_0E82: bne .return

#_1A8252: #_0E84: mov.b A, $47
#_1A8254: #_0E86: and.b A, $1A
#_1A8256: #_0E88: beq .do_pitch_slide

#_1A8258: #_0E8A: mov.b $10, #$04

.skip_loop
#_1A825B: #_0E8D: call SkipTrackByte

#_1A825E: #_0E90: dbnz.b $10, .skip_loop
#_1A8261: #_0E93: bra .return

.do_pitch_slide
#_1A8263: #_0E95: call SkipTrackByte
#_1A8266: #_0E98: call GetTrackByte

;---------------------------------------------------------------------------------------------------

#TrackCommand_F9_SlideOnce:
#_1A8269: #_0E9B: mov.b $A1+X, A

#_1A826B: #_0E9D: call GetTrackByte
#_1A826E: #_0EA0: mov.b $A0+X, A

#_1A8270: #_0EA2: call GetTrackByte
#_1A8273: #_0EA5: clrc
#_1A8274: #_0EA6: adc.b A, $50
#_1A8276: #_0EA8: adc.w A, $02F0+X

.calc_frames
#_1A8279: #_0EAB: and.b A, #$7F
#_1A827B: #_0EAD: mov.w $0380+X, A

#_1A827E: #_0EB0: setc
#_1A827F: #_0EB1: sbc.w A, $0361+X
#_1A8282: #_0EB4: mov.b Y, $A0+X

#_1A8284: #_0EB6: push Y
#_1A8285: #_0EB7: pop X
#_1A8286: #_0EB8: call MakeFraction

#_1A8289: #_0EBB: mov.w $0370+X, A

#_1A828C: #_0EBE: mov A, Y
#_1A828D: #_0EBF: mov.w $0371+X, A

.return
#_1A8290: #_0EC2: ret

;===================================================================================================

GetTempPitch:
#_1A8291: #_0EC3: mov.w A, $0361+X
#_1A8294: #_0EC6: mov.b $11, A

#_1A8296: #_0EC8: mov.w A, $0360+X
#_1A8299: #_0ECB: mov.b $10, A

#_1A829B: #_0ECD: ret

;===================================================================================================

MakeFraction:
#_1A829C: #_0ECE: notc
#_1A829D: #_0ECF: ror.b $12
#_1A829F: #_0ED1: bpl .positive_input

#_1A82A1: #_0ED3: eor.b A, #$FF
#_1A82A3: #_0ED5: inc A

.positive_input
#_1A82A4: #_0ED6: mov.b Y, #$00
#_1A82A6: #_0ED8: div YA, X

#_1A82A7: #_0ED9: push A

#_1A82A8: #_0EDA: mov.b A, #$00
#_1A82AA: #_0EDC: div YA, X

#_1A82AB: #_0EDD: pop Y

#_1A82AC: #_0EDE: mov.b X, $44

.abs
#_1A82AE: #_0EE0: bbc7.b $12, .was_clear

#_1A82B1: #_0EE3: movw.b $14, YA

#_1A82B3: #_0EE5: movw.b YA, $0E
#_1A82B5: #_0EE7: subw.b YA, $14

.was_clear
#_1A82B7: #_0EE9: ret

;===================================================================================================

TrackCommand_Vectors:
#_1A82B8: #_0EEA: dw TrackCommand_E0_ChangeInstrument
#_1A82BA: #_0EEC: dw TrackCommand_E1_ChangePan
#_1A82BC: #_0EEE: dw TrackCommand_E2_PanSlide
#_1A82BE: #_0EF0: dw TrackCommand_E3_SetVibrato

#_1A82C0: #_0EF2: dw TrackCommand_E4_VibratoOff
#_1A82C2: #_0EF4: dw TrackCommand_E5_GlobalVolume
#_1A82C4: #_0EF6: dw TrackCommand_E6_GlobalVolumeSlide
#_1A82C6: #_0EF8: dw TrackCommand_E7_SetTempo

#_1A82C8: #_0EFA: dw TrackCommand_E8_TempoSlide
#_1A82CA: #_0EFC: dw TrackCommand_E9_GlobalTranspose
#_1A82CC: #_0EFE: dw TrackCommand_EA_ChannelTranspose
#_1A82CE: #_0F00: dw TrackCommand_EB_SetTremelo

#_1A82D0: #_0F02: dw TrackCommand_EC_TremeloOff
#_1A82D2: #_0F04: dw TrackCommand_ED_ChannelVolume
#_1A82D4: #_0F06: dw TrackCommand_EE_ChannelVolumeSlide
#_1A82D6: #_0F08: dw TrackCommand_EF_CallPart

#_1A82D8: #_0F0A: dw TrackCommand_F0_VibratoGradient
#_1A82DA: #_0F0C: dw TrackCommand_F1_PitchSlideTo
#_1A82DC: #_0F0E: dw TrackCommand_F2_PitchSlideFrom
#_1A82DE: #_0F10: dw TrackCommand_F3_PitchSlideStop

#_1A82E0: #_0F12: dw TrackCommand_F4_FineTuning
#_1A82E2: #_0F14: dw TrackCommand_F5_EchoBasicControl
#_1A82E4: #_0F16: dw TrackCommand_F6_EchoSilence
#_1A82E6: #_0F18: dw TrackCommand_F7_EchoFilter

#_1A82E8: #_0F1A: dw TrackCommand_F8_EchoSlide
#_1A82EA: #_0F1C: dw TrackCommand_F9_SlideOnce
#_1A82EC: #_0F1E: dw TrackCommand_FA_PercussionOffset

;===================================================================================================

TrackCommandParamCount:
#_1A82EE: #_0F20: db 1 ; E0
#_1A82EF: #_0F21: db 1 ; E1
#_1A82F0: #_0F22: db 2 ; E2
#_1A82F1: #_0F23: db 3 ; E3
#_1A82F2: #_0F24: db 0 ; E4
#_1A82F3: #_0F25: db 1 ; E5
#_1A82F4: #_0F26: db 2 ; E6
#_1A82F5: #_0F27: db 1 ; E7
#_1A82F6: #_0F28: db 2 ; E8
#_1A82F7: #_0F29: db 1 ; E9
#_1A82F8: #_0F2A: db 1 ; EA
#_1A82F9: #_0F2B: db 3 ; EB
#_1A82FA: #_0F2C: db 0 ; EC
#_1A82FB: #_0F2D: db 1 ; ED
#_1A82FC: #_0F2E: db 2 ; EE
#_1A82FD: #_0F2F: db 3 ; EF
#_1A82FE: #_0F30: db 1 ; F0
#_1A82FF: #_0F31: db 3 ; F1
#_1A8300: #_0F32: db 3 ; F2
#_1A8301: #_0F33: db 0 ; F3
#_1A8302: #_0F34: db 1 ; F4
#_1A8303: #_0F35: db 3 ; F5
#_1A8304: #_0F36: db 0 ; F6
#_1A8305: #_0F37: db 3 ; F7
#_1A8306: #_0F38: db 3 ; F8
#_1A8307: #_0F39: db 3 ; F9
#_1A8308: #_0F3A: db 1 ; FA

; extraneous
#_1A8309: #_0F3B: db 2 ; FB
#_1A830A: #_0F3C: db 0 ; FC
#_1A830B: #_0F3D: db 0 ; FD
#_1A830C: #_0F3E: db 0 ; FE

;===================================================================================================

WritePitch:
#_1A830D: #_0F3F: mov.b A, $90+X
#_1A830F: #_0F41: beq .no_volume_slide

#_1A8311: #_0F43: mov.b A, #$0300>>0
#_1A8313: #_0F45: mov.b Y, #$0300>>8
#_1A8315: #_0F47: dec.b $90+X

#_1A8317: #_0F49: call IncrementSlide

.no_volume_slide
#_1A831A: #_0F4C: mov.b Y, $C1+X
#_1A831C: #_0F4E: beq .no_tremelo

#_1A831E: #_0F50: mov.w A, $02E0+X
#_1A8321: #_0F53: cbne.b $C0+X, .tremelo_not_ready

#_1A8324: #_0F56: or.b $5E, $47

#_1A8327: #_0F59: mov.w A, $02D0+X
#_1A832A: #_0F5C: bpl .tremelo_accumulate

#_1A832C: #_0F5E: inc Y
#_1A832D: #_0F5F: bne .tremelo_accumulate

#_1A832F: #_0F61: mov.b A, #$80
#_1A8331: #_0F63: bra .skip_accumulate

.tremelo_accumulate
#_1A8333: #_0F65: clrc
#_1A8334: #_0F66: adc.w A, $02D1+X

.skip_accumulate
#_1A8337: #_0F69: mov.w $02D0+X, A
#_1A833A: #_0F6C: call VolumeModulation_external
#_1A833D: #_0F6F: bra .handle_pan_slide

.tremelo_not_ready
#_1A833F: #_0F71: inc.b $C0+X

.no_tremelo
#_1A8341: #_0F73: mov.b A, #$FF
#_1A8343: #_0F75: call VolumeModulation_final_volume

.handle_pan_slide
#_1A8346: #_0F78: mov.b A, $91+X
#_1A8348: #_0F7A: beq .no_pan_slide

#_1A834A: #_0F7C: mov.b A, #$0330>>0
#_1A834C: #_0F7E: mov.b Y, #$0330>>8
#_1A834E: #_0F80: dec.b $91+X

#_1A8350: #_0F82: call IncrementSlide

.no_pan_slide
#_1A8353: #_0F85: mov.b A, $47
#_1A8355: #_0F87: and.b A, $5E
#_1A8357: #_0F89: beq .return

#_1A8359: #_0F8B: mov.w A, $0331+X
#_1A835C: #_0F8E: mov Y, A

#_1A835D: #_0F8F: mov.w A, $0330+X
#_1A8360: #_0F92: movw.b $10, YA

.external
#_1A8362: #_0F94: mov A, X
#_1A8363: #_0F95: xcn A
#_1A8364: #_0F96: lsr A
#_1A8365: #_0F97: mov.b $12, A

.vol_right
#_1A8367: #_0F99: mov.b Y, $11
#_1A8369: #_0F9B: mov.w A, LogisticFunc+1+Y
#_1A836C: #_0F9E: setc
#_1A836D: #_0F9F: sbc.w A, LogisticFunc+0+Y

#_1A8370: #_0FA2: mov.b Y, $10
#_1A8372: #_0FA4: mul YA

#_1A8373: #_0FA5: mov A, Y
#_1A8374: #_0FA6: mov.b Y, $11
#_1A8376: #_0FA8: clrc
#_1A8377: #_0FA9: adc.w A, LogisticFunc+0+Y

#_1A837A: #_0FAC: mov Y, A

#_1A837B: #_0FAD: mov.w A, $0321+X
#_1A837E: #_0FB0: mul YA

#_1A837F: #_0FB1: mov.w A, $0351+X

#_1A8382: #_0FB4: asl A
#_1A8383: #_0FB5: bbc0.b $12, .vol_left

#_1A8386: #_0FB8: asl A

.vol_left
#_1A8387: #_0FB9: mov A, Y
#_1A8388: #_0FBA: bcc .no_phase_inversion

#_1A838A: #_0FBC: eor.b A, #$FF
#_1A838C: #_0FBE: inc A

.no_phase_inversion
#_1A838D: #_0FBF: mov.b Y, $12
#_1A838F: #_0FC1: call WriteToDSP_Checked

#_1A8392: #_0FC4: mov.b Y, #$14
#_1A8394: #_0FC6: mov.b A, #$00

#_1A8396: #_0FC8: subw.b YA, $10
#_1A8398: #_0FCA: movw.b $10, YA

#_1A839A: #_0FCC: inc.b $12
#_1A839C: #_0FCE: bbc1.b $12, .vol_right

.return
#_1A839F: #_0FD1: ret

;===================================================================================================

IncrementSlide:
#_1A83A0: #_0FD2: or.b $5E, $47

.quiet
#_1A83A3: #_0FD5: movw.b $14, YA
#_1A83A5: #_0FD7: movw.b $16, YA

#_1A83A7: #_0FD9: push X
#_1A83A8: #_0FDA: pop Y

#_1A83A9: #_0FDB: clrc
#_1A83AA: #_0FDC: bne .still_sliding

#_1A83AC: #_0FDE: adc.b $16, #$1F

#_1A83AF: #_0FE1: mov.b A, #$00
#_1A83B1: #_0FE3: mov.b ($14)+Y, A

#_1A83B3: #_0FE5: inc Y
#_1A83B4: #_0FE6: bra .add

.still_sliding
#_1A83B6: #_0FE8: adc.b $16, #$10
#_1A83B9: #_0FEB: call .add_slide_amount

#_1A83BC: #_0FEE: inc Y

.add_slide_amount
#_1A83BD: #_0FEF: mov.b A, ($14)+Y

.add
#_1A83BF: #_0FF1: adc.b A, ($16)+Y
#_1A83C1: #_0FF3: mov.b ($14)+Y, A

#_1A83C3: #_0FF5: ret

;===================================================================================================

Tracker:
#_1A83C4: #_0FF6: mov.b A, $71+X
#_1A83C6: #_0FF8: beq .time_left

#_1A83C8: #_0FFA: dec.b $71+X
#_1A83CA: #_0FFC: beq .times_up

#_1A83CC: #_0FFE: mov.b A, #$02
#_1A83CE: #_1000: cbne.b $70+X, .time_left

.times_up
#_1A83D1: #_1003: mov.b A, $80+X
#_1A83D3: #_1005: mov.b $17, A

#_1A83D5: #_1007: mov.b A, $30+X
#_1A83D7: #_1009: mov.b Y, $31+X

.load_pointer
#_1A83D9: #_100B: movw.b $14, YA
#_1A83DB: #_100D: mov.b Y, #$00

.next_byte
#_1A83DD: #_100F: mov.b A, ($14)+Y
#_1A83DF: #_1011: beq .terminate_track
#_1A83E1: #_1013: bmi .command

.read_track_data
#_1A83E3: #_1015: inc Y
#_1A83E4: #_1016: bmi .call_loop_over

#_1A83E6: #_1018: mov.b A, ($14)+Y
#_1A83E8: #_101A: bpl .read_track_data

.command
#_1A83EA: #_101C: cmp.b A, #$C8 ; tie
#_1A83EC: #_101E: beq .time_left

#_1A83EE: #_1020: cmp.b A, #$EF ; call part
#_1A83F0: #_1022: beq .call_loop_command

#_1A83F2: #_1024: cmp.b A, #$E0 ; instrument change
#_1A83F4: #_1026: bcc .call_loop_over

#_1A83F6: #_1028: push Y
#_1A83F7: #_1029: mov Y, A

#_1A83F8: #_102A: pop A
#_1A83F9: #_102B: adc.w A, TrackCommandParamCount-$E0+Y
#_1A83FC: #_102E: mov Y, A

#_1A83FD: #_102F: bra .next_byte

.terminate_track
#_1A83FF: #_1031: mov.b A, $17
#_1A8401: #_1033: beq .call_loop_over

#_1A8403: #_1035: dec.b $17
#_1A8405: #_1037: bne .call_loop_notdone

#_1A8407: #_1039: mov.w A, $0231+X
#_1A840A: #_103C: push A

#_1A840B: #_103D: mov.w A, $0230+X
#_1A840E: #_1040: pop Y

#_1A840F: #_1041: bra .load_pointer

.call_loop_notdone
#_1A8411: #_1043: mov.w A, $0241+X
#_1A8414: #_1046: push A

#_1A8415: #_1047: mov.w A, $0240+X
#_1A8418: #_104A: pop Y

#_1A8419: #_104B: bra .load_pointer

.call_loop_command
#_1A841B: #_104D: inc Y
#_1A841C: #_104E: mov.b A, ($14)+Y

#_1A841E: #_1050: push A
#_1A841F: #_1051: inc Y

#_1A8420: #_1052: mov.b A, ($14)+Y

#_1A8422: #_1054: mov Y, A
#_1A8423: #_1055: pop A

#_1A8424: #_1056: bra .load_pointer

.call_loop_over
#_1A8426: #_1058: mov.b A, $47
#_1A8428: #_105A: mov.b Y, #KOFF
#_1A842A: #_105C: call WriteToDSP_Checked

.time_left
#_1A842D: #_105F: clr7.b $13

#_1A842F: #_1061: mov.b A, $A0+X
#_1A8431: #_1063: beq .no_pitch_slide

#_1A8433: #_1065: mov.b A, $A1+X
#_1A8435: #_1067: beq .delay_finished

#_1A8437: #_1069: dec.b $A1+X
#_1A8439: #_106B: bra .no_pitch_slide

.delay_finished
#_1A843B: #_106D: mov.b A, $1A
#_1A843D: #_106F: and.b A, $47
#_1A843F: #_1071: bne .no_pitch_slide

#_1A8441: #_1073: set7.b $13

#_1A8443: #_1075: mov.b A, #$0360>>0
#_1A8445: #_1077: mov.b Y, #$0360>>8
#_1A8447: #_1079: dec.b $A0+X

#_1A8449: #_107B: call IncrementSlide_quiet

.no_pitch_slide
#_1A844C: #_107E: call GetTempPitch

#_1A844F: #_1081: mov.b A, $B1+X
#_1A8451: #_1083: beq .no_vibrato

#_1A8453: #_1085: mov.w A, $02B0+X
#_1A8456: #_1088: cbne.b $B0+X, .set_point_wait

#_1A8459: #_108B: mov.w A, $0100+X
#_1A845C: #_108E: cmp.w A, $02B1+X
#_1A845F: #_1091: bne .increment

#_1A8461: #_1093: mov.w A, $02C1+X
#_1A8464: #_1096: bra .set_intensity

.increment
#_1A8466: #_1098: setp
#_1A8467: #_1099: inc.b $0100+X
#_1A8469: #_109B: clrp

#_1A846A: #_109C: mov Y, A
#_1A846B: #_109D: beq .initializing

#_1A846D: #_109F: mov.b A, $B1+X

.initializing
#_1A846F: #_10A1: clrc
#_1A8470: #_10A2: adc.w A, $02C0+X

.set_intensity
#_1A8473: #_10A5: mov.b $B1+X, A
#_1A8475: #_10A7: mov.w A, $02A0+X

#_1A8478: #_10AA: clrc
#_1A8479: #_10AB: adc.w A, $02A1+X
#_1A847C: #_10AE: mov.w $02A0+X, A

.handle_pitch
#_1A847F: #_10B1: mov.b $12, A
#_1A8481: #_10B3: asl A
#_1A8482: #_10B4: asl A
#_1A8483: #_10B5: bcc .low_enough

#_1A8485: #_10B7: eor.b A, #$FF

.low_enough
#_1A8487: #_10B9: mov Y, A

#_1A8488: #_10BA: mov.b A, $B1+X
#_1A848A: #_10BC: cmp.b A, #$F1
#_1A848C: #_10BE: bcc .too_small

#_1A848E: #_10C0: and.b A, #$0F
#_1A8490: #_10C2: mul YA

#_1A8491: #_10C3: bra .continue

.too_small
#_1A8493: #_10C5: mul YA
#_1A8494: #_10C6: mov A, Y
#_1A8495: #_10C7: mov.b Y, #$00

.continue
#_1A8497: #_10C9: call AdjustPitch

.change_pitch
#_1A849A: #_10CC: jmp HandleNote_external

.set_point_wait
#_1A849D: #_10CF: inc.b $B0+X

.no_vibrato
#_1A849F: #_10D1: bbs7.b $13, .change_pitch

#_1A84A2: #_10D4: ret

;===================================================================================================

BackgroundTasks:
#_1A84A3: #_10D5: clr7.b $13

#_1A84A5: #_10D7: mov.b A, $C1+X
#_1A84A7: #_10D9: beq .no_tremelo

#_1A84A9: #_10DB: mov.w A, $02E0+X
#_1A84AC: #_10DE: cbne.b $C0+X, .no_tremelo

#_1A84AF: #_10E1: call VolumeModulation

.no_tremelo
#_1A84B2: #_10E4: mov.w A, $0331+X
#_1A84B5: #_10E7: mov Y, A

#_1A84B6: #_10E8: mov.w A, $0330+X
#_1A84B9: #_10EB: movw.b $10, YA

#_1A84BB: #_10ED: mov.b A, $91+X
#_1A84BD: #_10EF: beq .no_pan_slide

#_1A84BF: #_10F1: mov.w A, $0341+X
#_1A84C2: #_10F4: mov Y, A
#_1A84C3: #_10F5: mov.w A, $0340+X

#_1A84C6: #_10F8: call AdjustPitchByFrames

.no_pan_slide
#_1A84C9: #_10FB: bbc7.b $13, .pitch_unchanged

#_1A84CC: #_10FE: call WritePitch_external

.pitch_unchanged
#_1A84CF: #_1101: clr7.b $13

#_1A84D1: #_1103: call GetTempPitch

#_1A84D4: #_1106: mov.b A, $A0+X
#_1A84D6: #_1108: beq .no_pitch_slide

#_1A84D8: #_110A: mov.b A, $A1+X
#_1A84DA: #_110C: bne .no_pitch_slide

#_1A84DC: #_110E: mov.w A, $0371+X
#_1A84DF: #_1111: mov Y, A
#_1A84E0: #_1112: mov.w A, $0370+X

#_1A84E3: #_1115: call AdjustPitchByFrames

.no_pitch_slide
#_1A84E6: #_1118: mov.b A, $B1+X
#_1A84E8: #_111A: beq Tracker_no_vibrato

#_1A84EA: #_111C: mov.w A, $02B0+X
#_1A84ED: #_111F: cbne.b $B0+X, Tracker_no_vibrato

#_1A84F0: #_1122: mov.b Y, $51
#_1A84F2: #_1124: mov.w A, $02A1+X

#_1A84F5: #_1127: mul YA
#_1A84F6: #_1128: mov A, Y
#_1A84F7: #_1129: clrc
#_1A84F8: #_112A: adc.w A, $02A0+X

#_1A84FB: #_112D: jmp Tracker_handle_pitch

;===================================================================================================

AdjustPitchByFrames:
#_1A84FE: #_1130: set7.b $13

#_1A8500: #_1132: mov.b $12, Y
#_1A8502: #_1134: call MakeFraction_abs

#_1A8505: #_1137: push Y

#_1A8506: #_1138: mov.b Y, $51
#_1A8508: #_113A: mul YA
#_1A8509: #_113B: mov.b $14, Y
#_1A850B: #_113D: mov.b $15, #$00

#_1A850E: #_1140: mov.b Y, $51

#_1A8510: #_1142: pop A
#_1A8511: #_1143: mul YA
#_1A8512: #_1144: addw.b YA, $14

;===================================================================================================

AdjustPitch:
#_1A8514: #_1146: call MakeFraction_abs

#_1A8517: #_1149: addw.b YA, $10
#_1A8519: #_114B: movw.b $10, YA

#_1A851B: #_114D: ret

;===================================================================================================

VolumeModulation:
#_1A851C: #_114E: set7.b $13

#_1A851E: #_1150: mov.b Y, $51
#_1A8520: #_1152: mov.w A, $02D1+X

#_1A8523: #_1155: mul YA
#_1A8524: #_1156: mov A, Y
#_1A8525: #_1157: clrc
#_1A8526: #_1158: adc.w A, $02D0+X

.external
#_1A8529: #_115B: asl A
#_1A852A: #_115C: bcc .no_phase_invert

#_1A852C: #_115E: eor.b A, #$FF

.no_phase_invert
#_1A852E: #_1160: mov.b Y, $C1+X
#_1A8530: #_1162: mul YA
#_1A8531: #_1163: mov A, Y
#_1A8532: #_1164: eor.b A, #$FF

.final_volume
#_1A8534: #_1166: mov.b Y, $59
#_1A8536: #_1168: mul YA

#_1A8537: #_1169: mov.w A, $0210+X
#_1A853A: #_116C: mul YA

#_1A853B: #_116D: mov.w A, $0301+X
#_1A853E: #_1170: mul YA

#_1A853F: #_1171: mov A, Y
#_1A8540: #_1172: mul YA

#_1A8541: #_1173: mov A, Y
#_1A8542: #_1174: mov.w $0321+X, A

#_1A8545: #_1177: ret

;===================================================================================================

LogisticFunc:
#_1A8546: #_1178: db $00, $01, $03, $07, $0D, $15, $1E, $29
#_1A854E: #_1180: db $34, $42, $51, $5E, $67, $6E, $73, $77
#_1A8556: #_1188: db $7A, $7C, $7D, $7E, $7F

;===================================================================================================
; TODO - analyze these
; Contains values for each of the 8 bytes of filter
;===================================================================================================
EchoFilterParameters:
#_1A855B: #_118D: db $7F, $00, $00, $00, $00, $00, $00, $00
#_1A8563: #_1195: db $58, $BF, $DB, $F0, $FE, $07, $0C, $0C
#_1A856B: #_119D: db $0C, $21, $2B, $2B, $13, $FE, $F3, $F9
#_1A8573: #_11A5: db $34, $33, $00, $D9, $E5, $01, $FC, $EB

;===================================================================================================

RegisterList:
#_1A857B: #_11AD: db EVOLL
#_1A857C: #_11AE: db EVOLR
#_1A857D: #_11AF: db EFB
#_1A857E: #_11B0: db EON
#_1A857F: #_11B1: db FLG
#_1A8580: #_11B2: db KON
#_1A8581: #_11B3: db KOFF
#_1A8582: #_11B4: db NON
#_1A8583: #_11B5: db PMON
#_1A8584: #_11B6: db KOFF

;===================================================================================================

LoadValueFrom:
#_1A8585: #_11B7: db $61 ; EVOLL
#_1A8586: #_11B8: db $63 ; EVOLR
#_1A8587: #_11B9: db $4E ; EFB
#_1A8588: #_11BA: db $4A ; EON
#_1A8589: #_11BB: db $48 ; FLG
#_1A858A: #_11BC: db $45 ; KON
#_1A858B: #_11BD: db $0E ; KOFF
#_1A858C: #_11BE: db $49 ; NON
#_1A858D: #_11BF: db $4B ; PMON
#_1A858E: #_11C0: db $46 ; KOFF

;===================================================================================================

TuningValues:
#_1A858F: #_11C1: dw $085F
#_1A8591: #_11C3: dw $08DE
#_1A8593: #_11C5: dw $0965
#_1A8595: #_11C7: dw $09F4
#_1A8597: #_11C9: dw $0A8C
#_1A8599: #_11CB: dw $0B2C
#_1A859B: #_11CD: dw $0BD6
#_1A859D: #_11CF: dw $0C8B
#_1A859F: #_11D1: dw $0D4A
#_1A85A1: #_11D3: dw $0E14
#_1A85A3: #_11D5: dw $0EEA
#_1A85A5: #_11D7: dw $0FCD
#_1A85A7: #_11D9: dw $10BE

;===================================================================================================

UNREACHABLE_11DB:
#_1A85A9: #_11DB: db $2A
#_1A85AA: #_11DC: db $56
#_1A85AB: #_11DD: db $65
#_1A85AC: #_11DE: db $72
#_1A85AD: #_11DF: db $20
#_1A85AE: #_11E0: db $53
#_1A85AF: #_11E1: db $31
#_1A85B0: #_11E2: db $2E
#_1A85B1: #_11E3: db $32
#_1A85B2: #_11E4: db $30
#_1A85B3: #_11E5: db $2A

;===================================================================================================

Data_Loader:
#_1A85B4: #_11E6: mov.b A, #$AA
#_1A85B6: #_11E8: mov.w CPUIO0, A

#_1A85B9: #_11EB: mov.b A, #$BB
#_1A85BB: #_11ED: mov.w CPUIO1, A

.wait_data_start
#_1A85BE: #_11F0: mov.w A, CPUIO0
#_1A85C1: #_11F3: cmp.b A, #$CC
#_1A85C3: #_11F5: bne .wait_data_start
#_1A85C5: #_11F7: bra .begin_transfer

.loop
#_1A85C7: #_11F9: mov.w Y, CPUIO0
#_1A85CA: #_11FC: bne .loop

.reread
#_1A85CC: #_11FE: cmp.w Y, CPUIO0
#_1A85CF: #_1201: bne .coherence_error

#_1A85D1: #_1203: mov.w A, CPUIO1
#_1A85D4: #_1206: mov.w CPUIO0, Y
#_1A85D7: #_1209: mov.b ($14)+Y, A

#_1A85D9: #_120B: inc Y
#_1A85DA: #_120C: bne .reread

#_1A85DC: #_120E: inc.b $15
#_1A85DE: #_1210: bra .reread

.coherence_error
#_1A85E0: #_1212: bpl .reread

#_1A85E2: #_1214: cmp.w Y, CPUIO0
#_1A85E5: #_1217: bpl .reread

.begin_transfer
#_1A85E7: #_1219: mov.w A, CPUIO2
#_1A85EA: #_121C: mov.w Y, CPUIO3
#_1A85ED: #_121F: movw.b $14, YA

#_1A85EF: #_1221: mov.w Y, CPUIO0
#_1A85F2: #_1224: mov.w A, CPUIO1
#_1A85F5: #_1227: mov.w CPUIO0, Y
#_1A85F8: #_122A: bne .loop

; clear ports 0123, start timer 0
#_1A85FA: #_122C: mov.b X, #$31
#_1A85FC: #_122E: mov.w CONTROL, X

#_1A85FF: #_1231: ret

;===================================================================================================

SFX2_HandleEcho:
#_1A8600: #_1232: mov.b A, $02
#_1A8602: #_1234: and.b A, #$3F
#_1A8604: #_1236: mov X, A

#_1A8605: #_1237: mov.w A, SFX2_Echo-1+X
#_1A8608: #_123A: mov.w $03E2, A

#_1A860B: #_123D: mov.b Y, #$0E
#_1A860D: #_123F: mov.b X, #$80
#_1A860F: #_1241: mov.w $03C1, X

.loop_back
#_1A8612: #_1244: mov.w A, $03CB
#_1A8615: #_1247: and.w A, $03C1
#_1A8618: #_124A: beq .SFX2_next_slot

#_1A861A: #_124C: clrc
#_1A861B: #_124D: mov.w A, $03A0+Y
#_1A861E: #_1250: adc.w A, $03D0+Y

#_1A8621: #_1253: cmp.b A, $02
#_1A8623: #_1255: beq SFX3_HandleEcho_match

.SFX2_next_slot
#_1A8625: #_1257: dec Y
#_1A8626: #_1258: dec Y

#_1A8627: #_1259: lsr.w $03C1
#_1A862A: #_125C: bne .loop_back
#_1A862C: #_125E: bra SFX3_HandleEcho_no_slot

;===================================================================================================

SFX3_HandleEcho:
#_1A862E: #_1260: mov.b A, $03
#_1A8630: #_1262: and.b A, #$3F
#_1A8632: #_1264: mov X, A

#_1A8633: #_1265: mov.w A, SFX3_Echo-1+X
#_1A8636: #_1268: mov.w $03E2, A

#_1A8639: #_126B: mov.b Y, #$0E
#_1A863B: #_126D: mov.b X, #$80
#_1A863D: #_126F: mov.w $03C1, X

.SFX3_loop_point
#_1A8640: #_1272: mov.w A, $03CD
#_1A8643: #_1275: and.w A, $03C1
#_1A8646: #_1278: beq .SFX3_next_slot

#_1A8648: #_127A: clrc
#_1A8649: #_127B: mov.w A, $03A0+Y
#_1A864C: #_127E: adc.w A, $03D0+Y

#_1A864F: #_1281: cmp.b A, $03
#_1A8651: #_1283: beq .match

.SFX3_next_slot
#_1A8653: #_1285: dec Y
#_1A8654: #_1286: dec Y

#_1A8655: #_1287: lsr.w $03C1
#_1A8658: #_128A: bne .SFX3_loop_point
#_1A865A: #_128C: bra .no_slot

.match
#_1A865C: #_128E: mov.w $03C0, Y
#_1A865F: #_1291: bra .enabled

.no_slot
#_1A8661: #_1293: clrc
#_1A8662: #_1294: mov.b X, #$1A

#_1A8664: #_1296: mov.b A, #$80
#_1A8666: #_1298: mov.w $03C1, A

#_1A8669: #_129B: mov.b Y, #$0E

.loop_back_2
#_1A866B: #_129D: and A, (X)
#_1A866C: #_129E: beq .enabled

#_1A866E: #_12A0: dec Y
#_1A866F: #_12A1: dec Y

#_1A8670: #_12A2: lsr.w $03C1
#_1A8673: #_12A5: lsr A
#_1A8674: #_12A6: bcc .loop_back_2

.enabled
#_1A8676: #_12A8: mov.w $03C0, Y
#_1A8679: #_12AB: mov.w $03C8, Y

#_1A867C: #_12AE: mov.w A, $03C1
#_1A867F: #_12B1: mov.w $03C9, A

#_1A8682: #_12B4: or.b A, $1A
#_1A8684: #_12B6: mov.b $1A, A

#_1A8686: #_12B8: mov.w X, $03E2
#_1A8689: #_12BB: beq .disabled

#_1A868B: #_12BD: or.w A, $03E3
#_1A868E: #_12C0: mov.w $03E3, A

.disabled
#_1A8691: #_12C3: mov.w A, $0004
#_1A8694: #_12C6: and.b A, #$10
#_1A8696: #_12C8: beq .lower_bank

#_1A8698: #_12CA: mov.w A, $03C1
#_1A869B: #_12CD: and.w A, $03E3
#_1A869E: #_12D0: beq .echo_off

.lower_bank
#_1A86A0: #_12D2: mov.w A, $03C1
#_1A86A3: #_12D5: and.b A, $4A
#_1A86A5: #_12D7: beq .echo_off

#_1A86A7: #_12D9: mov.b A, $4A
#_1A86A9: #_12DB: setc
#_1A86AA: #_12DC: sbc.w A, $03C1
#_1A86AD: #_12DF: mov.b $4A, A

#_1A86AF: #_12E1: mov.b Y, #EON
#_1A86B1: #_12E3: call WriteToDSP

.echo_off
#_1A86B4: #_12E6: ret

;===================================================================================================

Unused_Function:
#_1A86B5: #_12E7: mov.w X, $03C4
#_1A86B8: #_12EA: mov.w $03C0, X

#_1A86BB: #_12ED: mov.w Y, $03C5
#_1A86BE: #_12F0: mov.w $03C1, Y

#_1A86C1: #_12F3: mov.w A, $03C1
#_1A86C4: #_12F6: mov.b Y, #KOFF
#_1A86C6: #_12F8: call WriteToDSP

#_1A86C9: #_12FB: call ResumeMusic

#_1A86CC: #_12FE: ret

;===================================================================================================

InitSFX1:
#_1A86CD: #_12FF: mov.b $05, A
#_1A86CF: #_1301: cmp.b A, #$05
#_1A86D1: #_1303: bne .initialize

#_1A86D3: #_1305: mov.w X, $03CF
#_1A86D6: #_1308: bne .initialize

#_1A86D8: #_130A: ret

.initialize
#_1A86D9: #_130B: mov.b X, #$00
#_1A86DB: #_130D: mov.w $03E4, X

#_1A86DE: #_1310: mov.b X, #$0E

#_1A86E0: #_1312: mov.b A, $01
#_1A86E2: #_1314: mov.w $03A0+X, A

#_1A86E5: #_1317: mov.b A, #$03
#_1A86E7: #_1319: mov.w $03A1+X, A

#_1A86EA: #_131C: mov.b A, #$00
#_1A86EC: #_131E: mov.w $0280+X, A

#_1A86EF: #_1321: mov.b A, #$80
#_1A86F1: #_1323: mov.w $03CF, A

#_1A86F4: #_1326: mov.b Y, #KOFF
#_1A86F6: #_1328: call WriteToDSP

#_1A86F9: #_132B: set7.b $1A

#_1A86FB: #_132D: mov.b X, $01
#_1A86FD: #_132F: mov.w A, SFX1_Accomp-1+X

#_1A8700: #_1332: mov.b $01, A
#_1A8702: #_1334: bne .also_use_chan_6

#_1A8704: #_1336: ret

.also_use_chan_6
#_1A8705: #_1337: mov.b X, #$0C

#_1A8707: #_1339: mov.b A, $01
#_1A8709: #_133B: mov.w $03A0+X, A

#_1A870C: #_133E: mov.b A, #$03
#_1A870E: #_1340: mov.w $03A1+X, A

#_1A8711: #_1343: mov.b A, #$00
#_1A8713: #_1345: mov.w $0280+X, A

#_1A8716: #_1348: set6.b $1A

#_1A8718: #_134A: mov.b A, #$40
#_1A871A: #_134C: mov.b Y, #KOFF
#_1A871C: #_134E: call WriteToDSP

#_1A871F: #_1351: mov.b A, #$C0
#_1A8721: #_1353: mov.w $03CF, A

#_1A8724: #_1356: or.w A, $03E3
#_1A8727: #_1359: mov.w $03E3, A

#_1A872A: #_135C: mov.b A, #$3F
#_1A872C: #_135E: and.w A, $03CB
#_1A872F: #_1361: mov.w $03CB, A

#_1A8732: #_1364: mov.b A, #$3F
#_1A8734: #_1366: and.w A, $03CD
#_1A8737: #_1369: mov.w $03CD, A

#_1A873A: #_136C: ret

;===================================================================================================

HandleInput_SFX1:
#_1A873B: #_136D: mov.b A, $01
#_1A873D: #_136F: bmi .SFX1_negative

#_1A873F: #_1371: bne InitSFX1

#_1A8741: #_1373: ret

.SFX1_negative
#_1A8742: #_1374: mov.b $05, A

#_1A8744: #_1376: mov.w A, $03CF
#_1A8747: #_1379: beq .channels_not_used

#_1A8749: #_137B: mov.b A, #$78
#_1A874B: #_137D: mov.w $03E4, A

.channels_not_used
#_1A874E: #_1380: ret

;===================================================================================================

SFX1_FadeHandler:
#_1A874F: #_1381: dec.w $03E4

#_1A8752: #_1384: mov.w A, $03E4
#_1A8755: #_1387: bne .still_fading

#_1A8757: #_1389: mov.b A, #$05
#_1A8759: #_138B: mov.b $01, A
#_1A875B: #_138D: call InitSFX1_initialize

#_1A875E: #_1390: mov.b A, #$00
#_1A8760: #_1392: mov.b $01, A

#_1A8762: #_1394: ret

.still_fading
#_1A8763: #_1395: lsr A
#_1A8764: #_1396: mov.w $03E5, A
#_1A8767: #_1399: mov.b Y, #V7VOLL
#_1A8769: #_139B: call WriteToDSP

#_1A876C: #_139E: inc Y ; V7VOLR
#_1A876D: #_139F: mov.w A, $03E5
#_1A8770: #_13A2: call WriteToDSP

#_1A8773: #_13A5: mov.b Y, #V6VOLL
#_1A8775: #_13A7: mov.w A, $03E5
#_1A8778: #_13AA: call WriteToDSP

#_1A877B: #_13AD: inc Y ; V6VOLR
#_1A877C: #_13AE: mov.w A, $03E5
#_1A877F: #_13B1: call WriteToDSP

#_1A8782: #_13B4: jmp Handle_SFX1_no_fadeout

;===================================================================================================

HandleInput_SFX2:
#_1A8785: #_13B7: mov.b A, $02
#_1A8787: #_13B9: bne HandleValidSFX2

#_1A8789: #_13BB: ret

;===================================================================================================

HandleInput_SFX3:
#_1A878A: #_13BC: mov.b A, $03
#_1A878C: #_13BE: bne .valid

#_1A878E: #_13C0: ret

.valid
#_1A878F: #_13C1: mov.b A, #$FF
#_1A8791: #_13C3: cbne.b $1A, .not_all_muted
#_1A8794: #_13C6: bra .return

.not_all_muted
#_1A8796: #_13C8: call SFX3_HandleEcho

#_1A8799: #_13CB: mov.w X, $03C0

#_1A879C: #_13CE: mov.b A, $03
#_1A879E: #_13D0: and.b A, #$C0
#_1A87A0: #_13D2: mov.w $03D0+X, A

#_1A87A3: #_13D5: mov.b A, $03
#_1A87A5: #_13D7: and.b A, #$3F
#_1A87A7: #_13D9: mov.w $03A0+X, A

#_1A87AA: #_13DC: mov.b A, #$03
#_1A87AC: #_13DE: mov.w $03A1+X, A

#_1A87AF: #_13E1: mov.b A, #$00
#_1A87B1: #_13E3: mov.w $0280+X, A

#_1A87B4: #_13E6: mov.w A, $03C1
#_1A87B7: #_13E9: or.w A, $03CD
#_1A87BA: #_13EC: mov.w $03CD, A

#_1A87BD: #_13EF: mov.w A, $03C1
#_1A87C0: #_13F2: mov.b Y, #KOFF
#_1A87C2: #_13F4: call WriteToDSP

#_1A87C5: #_13F7: mov.w A, $03A0+X
#_1A87C8: #_13FA: mov X, A

#_1A87C9: #_13FB: mov.w A, SFX3_Accomp-1+X
#_1A87CC: #_13FE: mov.b $03, A
#_1A87CE: #_1400: bne .valid

.return
#_1A87D0: #_1402: ret

;===================================================================================================

HandleValidSFX2:
#_1A87D1: #_1403: mov.b A, #$FF
#_1A87D3: #_1405: cbne.b $1A, .not_all_muted

#_1A87D6: #_1408: bra .return

.not_all_muted
#_1A87D8: #_140A: call SFX2_HandleEcho

#_1A87DB: #_140D: mov.w X, $03C0

#_1A87DE: #_1410: mov.b A, $02
#_1A87E0: #_1412: and.b A, #$3F
#_1A87E2: #_1414: mov.w $03A0+X, A

#_1A87E5: #_1417: mov.b A, $02
#_1A87E7: #_1419: and.b A, #$C0
#_1A87E9: #_141B: mov.w $03D0+X, A

#_1A87EC: #_141E: mov.b A, #$03
#_1A87EE: #_1420: mov.w $03A1+X, A

#_1A87F1: #_1423: mov.b A, #$00
#_1A87F3: #_1425: mov.w $0280+X, A

#_1A87F6: #_1428: mov.w A, $03C1
#_1A87F9: #_142B: or.w A, $03CB
#_1A87FC: #_142E: mov.w $03CB, A

#_1A87FF: #_1431: mov.w A, $03C1
#_1A8802: #_1434: mov.b Y, #KOFF
#_1A8804: #_1436: call WriteToDSP

#_1A8807: #_1439: mov.w A, $03A0+X
#_1A880A: #_143C: mov X, A

#_1A880B: #_143D: mov.w A, SFX2_Accomp-1+X
#_1A880E: #_1440: mov.b $02, A

#_1A8810: #_1442: bne HandleValidSFX2

.return
#_1A8812: #_1444: ret

;===================================================================================================

Handle_SFX1:
#_1A8813: #_1445: mov.w A, $03E4
#_1A8816: #_1448: beq .no_fadeout

#_1A8818: #_144A: jmp SFX1_FadeHandler

.no_fadeout
#_1A881B: #_144D: mov.w A, $03CF

#_1A881E: #_1450: mov.w $03E0, A
#_1A8821: #_1453: beq .return

#_1A8823: #_1455: mov.b X, #$0E
#_1A8825: #_1457: mov.b A, #$80
#_1A8827: #_1459: mov.w $03C1, A

.next_channel
#_1A882A: #_145C: asl.w $03E0
#_1A882D: #_145F: bcc .unused_channel

#_1A882F: #_1461: mov.w $03C0, X

#_1A8832: #_1464: mov A, X
#_1A8833: #_1465: xcn A
#_1A8834: #_1466: lsr A
#_1A8835: #_1467: mov.w $03C2, A

#_1A8838: #_146A: mov.w A, $03D0+X
#_1A883B: #_146D: mov.b $20, A

#_1A883D: #_146F: mov.w A, $03A1+X
#_1A8840: #_1472: bne .delayed

#_1A8842: #_1474: mov.w A, $03A0+X
#_1A8845: #_1477: beq .unused_channel

#_1A8847: #_1479: jmp SFXControl

.unused_channel
#_1A884A: #_147C: lsr.w $03C1

#_1A884D: #_147F: dec X
#_1A884E: #_1480: dec X

#_1A884F: #_1481: cmp.b X, #$0A
#_1A8851: #_1483: bpl .next_channel

;---------------------------------------------------------------------------------------------------

.return
#_1A8853: #_1485: ret

.delayed
#_1A8854: #_1486: mov.w $03C0, X

#_1A8857: #_1489: mov.w A, $03A1+X
#_1A885A: #_148C: dec A
#_1A885B: #_148D: mov.w $03A1+X, A

#_1A885E: #_1490: beq .initialize

#_1A8860: #_1492: jmp .unused_channel

.initialize
#_1A8863: #_1495: mov.w A, $03A0+X
#_1A8866: #_1498: asl A
#_1A8867: #_1499: mov Y, A

#_1A8868: #_149A: mov.w A, SFX1_Pointers-1+Y
#_1A886B: #_149D: mov.w $0391+X, A
#_1A886E: #_14A0: mov.b $2D, A

#_1A8870: #_14A2: mov.w A, SFX1_Pointers-2+Y
#_1A8873: #_14A5: mov.w $0390+X, A
#_1A8876: #_14A8: mov.b $2C, A

#_1A8878: #_14AA: jmp SFXControl_process_byte

;===================================================================================================

Handle_SFX2:
#_1A887B: #_14AD: mov.w A, $03CB
#_1A887E: #_14B0: mov.w $03CC, A
#_1A8881: #_14B3: beq .return

#_1A8883: #_14B5: mov.b X, #$0E
#_1A8885: #_14B7: mov.b A, #$80
#_1A8887: #_14B9: mov.w $03C1, A

.loop
#_1A888A: #_14BC: asl.w $03CC
#_1A888D: #_14BF: bcc .next_channel

#_1A888F: #_14C1: mov.w $03C0, X
#_1A8892: #_14C4: mov A, X
#_1A8893: #_14C5: xcn A
#_1A8894: #_14C6: lsr A
#_1A8895: #_14C7: mov.w $03C2, A

#_1A8898: #_14CA: mov.w A, $03D0+X
#_1A889B: #_14CD: mov.b $20, A

#_1A889D: #_14CF: mov.w A, $03A1+X
#_1A88A0: #_14D2: bne .delayed

#_1A88A2: #_14D4: mov.w A, $03A0+X
#_1A88A5: #_14D7: beq .next_channel
#_1A88A7: #_14D9: jmp SFXControl

.next_channel
#_1A88AA: #_14DC: lsr.w $03C1
#_1A88AD: #_14DF: dec X
#_1A88AE: #_14E0: dec X
#_1A88AF: #_14E1: bpl .loop

.return
#_1A88B1: #_14E3: ret

.delayed
#_1A88B2: #_14E4: mov.w $03C0, X

#_1A88B5: #_14E7: mov.w A, $03A1+X
#_1A88B8: #_14EA: dec A
#_1A88B9: #_14EB: mov.w $03A1+X, A
#_1A88BC: #_14EE: beq .initialize

#_1A88BE: #_14F0: jmp .next_channel

.initialize
#_1A88C1: #_14F3: mov.w A, $03A0+X
#_1A88C4: #_14F6: asl A
#_1A88C5: #_14F7: mov Y, A

#_1A88C6: #_14F8: mov.w A, SFX2_Pointers-1+Y
#_1A88C9: #_14FB: mov.w $0391+X, A
#_1A88CC: #_14FE: mov.b $2D, A

#_1A88CE: #_1500: mov.w A, SFX2_Pointers-2+Y
#_1A88D1: #_1503: mov.w $0390+X, A
#_1A88D4: #_1506: mov.b $2C, A

#_1A88D6: #_1508: jmp SFXControl_process_byte

;===================================================================================================

Handle_SFX3:
#_1A88D9: #_150B: mov.w A, $03CD
#_1A88DC: #_150E: mov.w $03CE, A
#_1A88DF: #_1511: beq .return

#_1A88E1: #_1513: mov.b X, #$0E
#_1A88E3: #_1515: mov.b A, #$80
#_1A88E5: #_1517: mov.w $03C1, A

.next_channel
#_1A88E8: #_151A: asl.w $03CE
#_1A88EB: #_151D: bcc .inactive_channel

#_1A88ED: #_151F: mov.w $03C0, X
#_1A88F0: #_1522: mov A, X
#_1A88F1: #_1523: xcn A
#_1A88F2: #_1524: lsr A
#_1A88F3: #_1525: mov.w $03C2, A

#_1A88F6: #_1528: mov.w A, $03D0+X
#_1A88F9: #_152B: mov.b $20, A

#_1A88FB: #_152D: mov.w A, $03A1+X
#_1A88FE: #_1530: bne .delayed

#_1A8900: #_1532: mov.w A, $03A0+X
#_1A8903: #_1535: beq .inactive_channel

#_1A8905: #_1537: jmp SFXControl

.inactive_channel
#_1A8908: #_153A: lsr.w $03C1
#_1A890B: #_153D: dec X
#_1A890C: #_153E: dec X
#_1A890D: #_153F: bpl .next_channel

.return
#_1A890F: #_1541: ret

.delayed
#_1A8910: #_1542: mov.w $03C0, X

#_1A8913: #_1545: mov.w A, $03A1+X
#_1A8916: #_1548: dec A
#_1A8917: #_1549: mov.w $03A1+X, A

#_1A891A: #_154C: beq .initialize
#_1A891C: #_154E: jmp .inactive_channel

.initialize
#_1A891F: #_1551: mov.w A, $03A0+X
#_1A8922: #_1554: asl A
#_1A8923: #_1555: mov Y, A

#_1A8924: #_1556: mov.w A, SFX3_Pointers-1+Y
#_1A8927: #_1559: mov.w $0391+X, A
#_1A892A: #_155C: mov.b $2D, A

#_1A892C: #_155E: mov.w A, SFX3_Pointers-2+Y
#_1A892F: #_1561: mov.w $0390+X, A
#_1A8932: #_1564: mov.b $2C, A

#_1A8934: #_1566: jmp SFXControl_process_byte

;===================================================================================================

ResumeMusic:
#_1A8937: #_1569: mov.b A, #$00
#_1A8939: #_156B: mov.w X, $03C0
#_1A893C: #_156E: mov.w $03A0+X, A

#_1A893F: #_1571: mov.b A, $1A
#_1A8941: #_1573: setc
#_1A8942: #_1574: sbc.w A, $03C1
#_1A8945: #_1577: mov.b $1A, A

#_1A8947: #_1579: mov.w A, $03C1
#_1A894A: #_157C: and.w A, $03CB
#_1A894D: #_157F: beq .not_on_SFX_2

#_1A894F: #_1581: mov.w A, $03CB
#_1A8952: #_1584: setc
#_1A8953: #_1585: sbc.w A, $03C1
#_1A8956: #_1588: mov.w $03CB, A

#_1A8959: #_158B: bra .resume

.not_on_SFX_2
#_1A895B: #_158D: mov.w A, $03C1
#_1A895E: #_1590: and.w A, $03CD
#_1A8961: #_1593: beq .not_on_SFX_3

#_1A8963: #_1595: mov.w A, $03CD
#_1A8966: #_1598: setc
#_1A8967: #_1599: sbc.w A, $03C1
#_1A896A: #_159C: mov.w $03CD, A

#_1A896D: #_159F: bra .resume

.not_on_SFX_3
#_1A896F: #_15A1: mov.w A, $03CF
#_1A8972: #_15A4: setc
#_1A8973: #_15A5: sbc.w A, $03C1
#_1A8976: #_15A8: mov.w $03CF, A

.resume
#_1A8979: #_15AB: mov.b $44, X
#_1A897B: #_15AD: mov.w A, $0211+X
#_1A897E: #_15B0: call TrackCommand_E0_ChangeInstrument

#_1A8981: #_15B3: mov.w A, $03C1
#_1A8984: #_15B6: and.w A, $03C3
#_1A8987: #_15B9: beq .return

#_1A8989: #_15BB: and.b A, $4A
#_1A898B: #_15BD: bne .return

#_1A898D: #_15BF: mov.b A, $4A
#_1A898F: #_15C1: clrc
#_1A8990: #_15C2: adc.w A, $03C1
#_1A8993: #_15C5: mov.b $4A, A

#_1A8995: #_15C7: mov.b Y, #EON
#_1A8997: #_15C9: call WriteToDSP

#_1A899A: #_15CC: mov.w A, $03E3
#_1A899D: #_15CF: setc
#_1A899E: #_15D0: sbc.w A, $03C1
#_1A89A1: #_15D3: mov.w $03E3, A

.return
#_1A89A4: #_15D6: mov.w X, $03C0

#_1A89A7: #_15D9: ret

;===================================================================================================

DisableSFX:
#_1A89A8: #_15DA: mov.w A, $03C1
#_1A89AB: #_15DD: and.w A, $03CF
#_1A89AE: #_15E0: bne .used_by_SFX_1

#_1A89B0: #_15E2: mov.w A, $03C1
#_1A89B3: #_15E5: and.w A, $03CB
#_1A89B6: #_15E8: bne .used_by_SFX_2

#_1A89B8: #_15EA: call ResumeMusic
#_1A89BB: #_15ED: jmp Handle_SFX3_inactive_channel

.used_by_SFX_1
#_1A89BE: #_15F0: call ResumeMusic
#_1A89C1: #_15F3: jmp Handle_SFX1_unused_channel

.used_by_SFX_2
#_1A89C4: #_15F6: call ResumeMusic
#_1A89C7: #_15F9: jmp Handle_SFX2_next_channel

;===================================================================================================

SFXControl:
#_1A89CA: #_15FC: call SFX3_HandleEcho_disabled

#_1A89CD: #_15FF: mov.w $03C0, X
#_1A89D0: #_1602: mov.w A, $0391+X
#_1A89D3: #_1605: mov Y, A

#_1A89D4: #_1606: mov.w A, $0390+X
#_1A89D7: #_1609: movw.b $2C, YA

#_1A89D9: #_160B: mov.w A, $03B0+X
#_1A89DC: #_160E: dec A
#_1A89DD: #_160F: mov.w $03B0+X, A

#_1A89E0: #_1612: beq .next_byte
#_1A89E2: #_1614: jmp .do_pitch_slide

.next_byte
#_1A89E5: #_1617: incw.b $2C

.process_byte
#_1A89E7: #_1619: mov.w A, $03C0
#_1A89EA: #_161C: xcn A
#_1A89EB: #_161D: lsr A
#_1A89EC: #_161E: mov.w $03C2, A

#_1A89EF: #_1621: mov.b X, #$00
#_1A89F1: #_1623: mov.b A, ($2C+X)

#_1A89F3: #_1625: beq DisableSFX
#_1A89F5: #_1627: bmi .note_or_command

#_1A89F7: #_1629: mov.w Y, $03C0
#_1A89FA: #_162C: mov.w $03B1+Y, A

#_1A89FD: #_162F: incw.b $2C
#_1A89FF: #_1631: mov.b A, ($2C+X)
#_1A8A01: #_1633: mov.b $10, A
#_1A8A03: #_1635: bmi .note_or_command

#_1A8A05: #_1637: mov X, A
#_1A8A06: #_1638: mov.w A, $03C1
#_1A8A09: #_163B: and.w A, $03CF
#_1A8A0C: #_163E: beq .not_SFX_1

#_1A8A0E: #_1640: mov A, X
#_1A8A0F: #_1641: beq .zero_byte

#_1A8A11: #_1643: mov.w X, $03E5
#_1A8A14: #_1646: bne .next_byte_2

.zero_byte
#_1A8A16: #_1648: mov.b $10, A
#_1A8A18: #_164A: mov.w Y, $03C2
#_1A8A1B: #_164D: call WriteToDSP

#_1A8A1E: #_1650: mov.b X, #$00
#_1A8A20: #_1652: incw.b $2C
#_1A8A22: #_1654: mov.b A, ($2C+X)
#_1A8A24: #_1656: bpl .volume_command

#_1A8A26: #_1658: mov X, A
#_1A8A27: #_1659: mov.b A, $10
#_1A8A29: #_165B: mov.w Y, $03C2
#_1A8A2C: #_165E: inc Y
#_1A8A2D: #_165F: call WriteToDSP

#_1A8A30: #_1662: mov A, X
#_1A8A31: #_1663: bra .note_or_command

.volume_command
#_1A8A33: #_1665: mov.w Y, $03C2
#_1A8A36: #_1668: inc Y
#_1A8A37: #_1669: call WriteToDSP

#_1A8A3A: #_166C: bra .next_byte_2

.not_SFX_1
#_1A8A3C: #_166E: mov A, X
#_1A8A3D: #_166F: mov.w X, $03C0

#_1A8A40: #_1672: asl A
#_1A8A41: #_1673: mov.w $0321+X, A

#_1A8A44: #_1676: mov.b A, #$0A
#_1A8A46: #_1678: mov.w $0351+X, A

#_1A8A49: #_167B: bbs7.b $20, .left_pan
#_1A8A4C: #_167E: bbs6.b $20, .right_pan

#_1A8A4F: #_1681: mov.b $11, #$0A
#_1A8A52: #_1684: bne .set_pan

.left_pan
#_1A8A54: #_1686: mov.b $11, #$10
#_1A8A57: #_1689: bne .set_pan

.right_pan
#_1A8A59: #_168B: mov.b $11, #$04

.set_pan
#_1A8A5C: #_168E: mov.b $10, #$00
#_1A8A5F: #_1691: call WritePitch_external

#_1A8A62: #_1694: mov.b X, #$00

.next_byte_2
#_1A8A64: #_1696: incw.b $2C
#_1A8A66: #_1698: mov.b A, ($2C+X)

.note_or_command
#_1A8A68: #_169A: cmp.b A, #$E0 ; instrument change
#_1A8A6A: #_169C: bne .not_instrument_change

#_1A8A6C: #_169E: jmp .change_instrument

.not_instrument_change
#_1A8A6F: #_16A1: cmp.b A, #$F9 ; slide once
#_1A8A71: #_16A3: beq .pitch_slide_command

#_1A8A73: #_16A5: cmp.b A, #$F1 ; slide to
#_1A8A75: #_16A7: beq .pitch_slide_to_command

#_1A8A77: #_16A9: cmp.b A, #$FF ; SFX loop trigger
#_1A8A79: #_16AB: bne .not_loop

#_1A8A7B: #_16AD: mov.w X, $03C0
#_1A8A7E: #_16B0: jmp Handle_SFX1_initialize

.not_loop
#_1A8A81: #_16B3: mov.w X, $03C0
#_1A8A84: #_16B6: mov Y, A
#_1A8A85: #_16B7: call HandleNote

#_1A8A88: #_16BA: mov.w A, $03C1
#_1A8A8B: #_16BD: call KeyOnChannels

.setup_pitch_slide
#_1A8A8E: #_16C0: mov.w X, $03C0

#_1A8A91: #_16C3: mov.w A, $03B1+X
#_1A8A94: #_16C6: mov.w $03B0+X, A

.do_pitch_slide
#_1A8A97: #_16C9: clr7.b $13

#_1A8A99: #_16CB: mov.w X, $03C0
#_1A8A9C: #_16CE: mov.b A, $A0+X
#_1A8A9E: #_16D0: beq .no_pitch_slide

#_1A8AA0: #_16D2: call PitchSlideSFX
#_1A8AA3: #_16D5: bra .dont_key_off

.no_pitch_slide
#_1A8AA5: #_16D7: mov.b A, #$02
#_1A8AA7: #_16D9: cmp.w A, $03B0+X
#_1A8AAA: #_16DC: bne .dont_key_off

#_1A8AAC: #_16DE: mov.w A, $03C1
#_1A8AAF: #_16E1: mov.b Y, #KOFF
#_1A8AB1: #_16E3: call WriteToDSP

.dont_key_off
#_1A8AB4: #_16E6: mov.w X, $03C0

#_1A8AB7: #_16E9: mov.b A, $2D
#_1A8AB9: #_16EB: mov.w $0391+X, A

#_1A8ABC: #_16EE: mov.b A, $2C
#_1A8ABE: #_16F0: mov.w $0390+X, A

#_1A8AC1: #_16F3: mov.w A, $03C1
#_1A8AC4: #_16F6: and.w A, $03CF
#_1A8AC7: #_16F9: bne .on_SFX_1

#_1A8AC9: #_16FB: mov.w A, $03C1
#_1A8ACC: #_16FE: and.w A, $03CB
#_1A8ACF: #_1701: bne .on_SFX_2
#_1A8AD1: #_1703: jmp Handle_SFX3_inactive_channel

.on_SFX_1
#_1A8AD4: #_1706: jmp Handle_SFX1_unused_channel

.on_SFX_2
#_1A8AD7: #_1709: jmp Handle_SFX2_next_channel

;---------------------------------------------------------------------------------------------------

.pitch_slide_command
#_1A8ADA: #_170C: mov.b X, #$00
#_1A8ADC: #_170E: incw.b $2C
#_1A8ADE: #_1710: mov.b A, ($2C+X)

#_1A8AE0: #_1712: mov.w X, $03C0

#_1A8AE3: #_1715: mov.b $44, X
#_1A8AE5: #_1717: mov Y, A
#_1A8AE6: #_1718: call HandleNote

#_1A8AE9: #_171B: mov.w A, $03C1
#_1A8AEC: #_171E: call KeyOnChannels

;---------------------------------------------------------------------------------------------------

.pitch_slide_to_command
#_1A8AEF: #_1721: mov.b X, #$00
#_1A8AF1: #_1723: incw.b $2C
#_1A8AF3: #_1725: mov.b A, ($2C+X)

#_1A8AF5: #_1727: mov.w X, $03C0

#_1A8AF8: #_172A: mov.b $A1+X, A
#_1A8AFA: #_172C: mov.b X, #$00

#_1A8AFC: #_172E: incw.b $2C
#_1A8AFE: #_1730: mov.b A, ($2C+X)
#_1A8B00: #_1732: mov.w X, $03C0

#_1A8B03: #_1735: mov.b $A0+X, A
#_1A8B05: #_1737: push A

#_1A8B06: #_1738: mov.b X, #$00
#_1A8B08: #_173A: incw.b $2C
#_1A8B0A: #_173C: mov.b A, ($2C+X)

#_1A8B0C: #_173E: pop Y
#_1A8B0D: #_173F: mov.w X, $03C0
#_1A8B10: #_1742: mov.b $44, X

#_1A8B12: #_1744: call PitchSlide_calc_frames

#_1A8B15: #_1747: jmp .setup_pitch_slide

;---------------------------------------------------------------------------------------------------

.change_instrument
#_1A8B18: #_174A: mov.b X, #$00
#_1A8B1A: #_174C: incw.b $2C
#_1A8B1C: #_174E: mov.b A, ($2C+X)

#_1A8B1E: #_1750: mov.b Y, #$09
#_1A8B20: #_1752: mul YA
#_1A8B21: #_1753: mov X, A

#_1A8B22: #_1754: mov.w Y, $03C2
#_1A8B25: #_1757: mov.b $12, #$08

.write_loop
#_1A8B28: #_175A: mov.w A, INSTRUMENT_DATA_SFX+X
#_1A8B2B: #_175D: call WriteToDSP

#_1A8B2E: #_1760: inc X
#_1A8B2F: #_1761: inc Y
#_1A8B30: #_1762: dbnz.b $12, .write_loop

#_1A8B33: #_1765: mov.w A, INSTRUMENT_DATA_SFX+X

#_1A8B36: #_1768: mov.w Y, $03C0
#_1A8B39: #_176B: mov.w $0221+Y, A

#_1A8B3C: #_176E: mov.b A, #$00
#_1A8B3E: #_1770: mov.w $0220+Y, A

#_1A8B41: #_1773: jmp .next_byte

;===================================================================================================

PitchSlideSFX:
#_1A8B44: #_1776: set7.b $13

#_1A8B46: #_1778: mov.b A, #$0360>>0
#_1A8B48: #_177A: mov.b Y, #$0360>>8

#_1A8B4A: #_177C: dec.b $A0+X
#_1A8B4C: #_177E: call IncrementSlide_quiet

#_1A8B4F: #_1781: mov.w A, $0361+X
#_1A8B52: #_1784: mov Y, A
#_1A8B53: #_1785: mov.w A, $0360+X
#_1A8B56: #_1788: movw.b $10, YA

#_1A8B58: #_178A: mov.b $47, #$00
#_1A8B5B: #_178D: jmp HandleNote_external

;===================================================================================================

KeyOnChannels:
#_1A8B5E: #_1790: push A

#_1A8B5F: #_1791: mov.b Y, #KOFF
#_1A8B61: #_1793: mov.b A, #$00
#_1A8B63: #_1795: call WriteToDSP

#_1A8B66: #_1798: pop A
#_1A8B67: #_1799: mov.b Y, #KON

#_1A8B69: #_179B: jmp WriteToDSP

;===================================================================================================

base off

arch 65816