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mock.asm
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; PSG Register enums
PSGFreqFineA .equ $00
PSGFreqCourseA .equ $01
PSGFreqFineB .equ $02
PSGFreqCourseB .equ $03
PSGFreqFineC .equ $04
PSGFreqCourseC .equ $05
PSGFreqNG .equ $06
PSGEnableControl .equ $07
PSGLevelAndEnvA .equ $08
PSGLevelAndEnvB .equ $09
PSGLevelAndEnvC .equ $0a
PSGEnvPeriodFine .equ $0b
PSGEnvPeriodCourse .equ $0c
PSGEnvShape .equ $0d
; PSG enable flags
PSGEnableNoiseOnC .equ 32
PSGEnableNoiseOnB .equ 16
PSGEnableNoiseOnA .equ 8
PSGEnableToneOnC .equ 4
PSGEnableToneOnB .equ 2
PSGEnableToneOnA .equ 1
startmock JSR MBInit
JSR ToneTest
RTS
; Register in A, X .equ $00 for chip 0, $80 for chip 1
MBRegSelect
JSR SetPSGRegIdx
JSR VIASetA
JSR VIASetRegister
RTS
MBRegWrite JSR StrPSGRegVal
JSR VIASetA
JSR VIAWriteData
RTS
MBRegRead ;JSR VIAReadData ; Seems register reads from the PSG works fine with microM8, Jace
;JSR VIAGetA ; and not so well with AppleWin and Virtual II
JSR GetPSGRegVal
RTS
MBInit JSR RstPSGReg
JSR VIAInit
LDX #$80
JSR VIAReset
LDX #$00
JSR VIAReset
LDX #0
LDA #PSGEnableControl
JSR MBRegSelect
LDA #255
JSR MBRegWrite
LDX #$80
LDA #PSGEnableControl
JSR MBRegSelect
LDA #255
JSR MBRegWrite
LDA #255
STA PSGEnableState+0
STA PSGEnableState+1
LDA #0
STA PSGVolumeA
STA PSGVolumeA+1
STA PSGVolumeB
STA PSGVolumeB+1
STA PSGVolumeC
STA PSGVolumeC+1
RTS
ToneTest
JSR StartSong
RTS
SetTonePeriodCoarseA TAY
LDA #PSGFreqCourseA
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetTonePeriodCoarseB TAY
LDA #PSGFreqCourseB
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetTonePeriodCoarseC TAY
LDA #PSGFreqCourseC
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetTonePeriodFineA TAY
LDA #PSGFreqFineA
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetTonePeriodFineB TAY
LDA #PSGFreqFineB
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetTonePeriodFineC TAY
LDA #PSGFreqFineC
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
EnableToneA
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$FE
JSR StorePSGEnableState
JSR MBRegWrite
RTS
EnableToneB
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$FD
JSR StorePSGEnableState
JSR MBRegWrite
RTS
EnableToneC
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$FB
JSR StorePSGEnableState
JSR MBRegWrite
RTS
EnableNoiseA
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$F7
JSR StorePSGEnableState
JSR MBRegWrite
RTS
EnableNoiseB
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$EF
JSR StorePSGEnableState
JSR MBRegWrite
RTS
EnableNoiseC
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
AND #$DF
JSR StorePSGEnableState
JSR MBRegWrite
RTS
; disable code
DisableToneA
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #1
JSR StorePSGEnableState
JSR MBRegWrite
RTS
DisableToneB
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #2
JSR StorePSGEnableState
JSR MBRegWrite
RTS
DisableToneC
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #4
JSR StorePSGEnableState
JSR MBRegWrite
RTS
DisableNoiseA
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #8
JSR StorePSGEnableState
JSR MBRegWrite
RTS
DisableNoiseB
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #16
JSR StorePSGEnableState
JSR MBRegWrite
RTS
DisableNoiseC
LDA #PSGEnableControl
JSR MBRegSelect
JSR ReadPSGEnableState
ORA #32
JSR StorePSGEnableState
JSR MBRegWrite
RTS
SetVolumeA JSR StoreVolumeA
TAY
LDA #PSGLevelAndEnvA
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetVolumeB JSR StoreVolumeB
TAY
LDA #PSGLevelAndEnvB
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetVolumeC JSR StoreVolumeC
TAY
LDA #PSGLevelAndEnvC
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetNoisePeriod TAY
LDA #PSGFreqNG
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetEnvShape TAY
LDA #PSGEnvShape
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetEnvPeriodCoarse TAY
LDA #PSGEnvPeriodCourse
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
SetEnvPeriodFine TAY
LDA #PSGEnvPeriodFine
JSR MBRegSelect
TYA
JSR MBRegWrite
RTS
; used for reading / writing PSG register values
PSGRegister .byte $00
PSGValue .byte $00
;
PSGEnableState .byte $ff
.byte $ff
PSGVolumeA .byte $00
.byte $00
PSGVolumeB .byte $00
.byte $00
PSGVolumeC .byte $00
.byte $00
PSGSaveX .equ $D9
ReadPSGEnableState ; Assumes X = $80/$00
STX PSGSaveX
TXA
CLC
ROL
ROL
TAX
LDA PSGEnableState,X
LDX PSGSaveX
RTS
StorePSGEnableState ; Assumes X = $80/$00
PHA ; save a
STX PSGSaveX ; save x
TXA ; x -> a
CLC ; << 2
ROL
ROL
TAX ; a -> x
PLA ; restore a
STA PSGEnableState,X
LDX PSGSaveX
RTS
ReadVolumeA ; Assumes X = $80/$00
STX PSGSaveX
TXA
CLC
ROL
ROL
TAX
LDA PSGVolumeA,X
LDX PSGSaveX
RTS
StoreVolumeA ; Assumes X = $80/$00
PHA ; save a
STX PSGSaveX ; save x
TXA ; x -> a
CLC ; << 2
ROL
ROL
TAX ; a -> x
PLA ; restore a
STA PSGVolumeA,X
LDX PSGSaveX
RTS
ReadVolumeB ; Assumes X = $80/$00
STX PSGSaveX
TXA
CLC
ROL
ROL
TAX
LDA PSGVolumeB,X
LDX PSGSaveX
RTS
StoreVolumeB ; Assumes X = $80/$00
PHA ; save a
STX PSGSaveX ; save x
TXA ; x -> a
CLC ; << 2
ROL
ROL
TAX ; a -> x
PLA ; restore a
STA PSGVolumeB,X
LDX PSGSaveX
RTS
ReadVolumeC ; Assumes X = $80/$00
STX PSGSaveX
TXA
CLC
ROL
ROL
TAX
LDA PSGVolumeC,X
LDX PSGSaveX
RTS
StoreVolumeC ; Assumes X = $80/$00
PHA ; save a
STX PSGSaveX ; save x
TXA ; x -> a
CLC ; << 2
ROL
ROL
TAX ; a -> x
PLA ; restore a
STA PSGVolumeC,X
LDX PSGSaveX
RTS
; note offsets
; 0: tone period coarse | 0xff
; 1: tone period fine | 0xff
; 2: noise period | 0xff
; 3: volume | 0xff
; 4: env coarse | 0xff
; 5: env fine | 0xff
; 6: env shape | 0xff
; 7: command | 0xff
; 8: command val
offsetToneCoarse .equ $00
offsetToneFine .equ $01
offsetNoisePeriod .equ $02
offsetVolume .equ $03
offsetEnvCoarse .equ $04
offsetEnvFine .equ $05
offsetEnvShape .equ $06
offsetCommand .equ $07
offsetCommandParam .equ $08
offsetChannelState .equ $09
REGPtr .byte $00
REGSaveBuffer .byte 0,0,0,0,0,0,0,255
.byte 0,0,0,0,0,0,0,0
.byte 0,0,0,0,0,0,0,255
.byte 0,0,0,0,0,0,0,0
RstPSGReg LDX #0
LDA #0
RstPSGRegL STA REGSaveBuffer,X
INX
CPX #32
BNE RstPSGRegL
LDA #255
STA REGSaveBuffer+7
STA REGSaveBuffer+23
RTS
SetPSGRegIdx ; X = $00/$80, A = PSGRegNumber
STA REGPtr
; save registers X, A
PHA
TXA
PHA
; now xreg is in A
CLC
ROR
ROR
ROR
ADC REGPtr
STA REGPtr
PLA
TAX
PLA
RTS
GetPSGRegVal LDY REGPtr
LDA REGSaveBuffer,Y
RTS
StrPSGRegVal LDY REGPtr
STA REGSaveBuffer,Y
RTS
; GetTonePeriodCoarse
GetTonePeriodCoarse
LDA noteChannel
BNE GTPCIs1
LDA #PSGFreqCourseA
JMP GetTPCValue
GTPCIs1
CMP #1
BNE GTPCIs2
LDA #PSGFreqCourseB
JMP GetTPCValue
GTPCIs2
LDA #PSGFreqCourseC
GetTPCValue
JSR MBRegSelect
JSR MBRegRead
RTS
; GetTonePeriodFine
GetTonePeriodFine
LDA noteChannel
BNE GTPFIs1
LDA #PSGFreqFineA
JMP GetTPFValue
GTPFIs1
CMP #1
BNE GTPFIs2
LDA #PSGFreqFineB
JMP GetTPFValue
GTPFIs2
LDA #PSGFreqFineC
GetTPFValue
JSR MBRegSelect
JSR MBRegRead
RTS
; SetTonePeriodCoarse
SetTonePeriodCoarse PHA
LDA noteChannel
BNE TPCIs1
PLA
JSR SetTonePeriodCoarseA
RTS
TPCIs1 CMP #1
BNE TPCIs2
PLA
JSR SetTonePeriodCoarseB
RTS
TPCIs2 PLA
JSR SetTonePeriodCoarseC
RTS
; SetTonePeriodFine
SetTonePeriodFine PHA
LDA noteChannel
BNE TPFIs1
PLA
JSR SetTonePeriodFineA
RTS
TPFIs1 CMP #1
BNE TPFIs2
PLA
JSR SetTonePeriodFineB
RTS
TPFIs2 PLA
JSR SetTonePeriodFineC
RTS
; GetVolume
GetVolume PHA
LDA noteChannel
BNE GVIs1
LDA #PSGLevelAndEnvA
JMP GVRead
GVIs1
CMP #1
BNE GVIs2
LDA #PSGLevelAndEnvB
JMP GVRead
GVIs2
LDA #PSGLevelAndEnvC
GVRead JSR MBRegSelect
JSR MBRegRead
RTS
; SetVolume
SetVolume PHA
LDA noteChannel
BNE SVIs1
PLA
JSR SetVolumeA
RTS
SVIs1 CMP #1
BNE SVIs2
PLA
JSR SetVolumeB
RTS
SVIs2 PLA
JSR SetVolumeC
RTS
; EnableTone
EnableTone
LDA noteChannel
BNE ETIs1
JSR EnableToneA
RTS
ETIs1 CMP #1
BNE ETIs2
JSR EnableToneB
RTS
ETIs2 JSR EnableToneC
RTS
; DisableTone
DisableTone
LDA noteChannel
BNE DTIs1
JSR DisableToneA
RTS
DTIs1 CMP #1
BNE DTIs2
JSR DisableToneB
RTS
DTIs2 JSR DisableToneC
RTS
; EnableNoise
EnableNoise
LDA noteChannel
BNE ENIs1
JSR EnableNoiseA
RTS
ENIs1 CMP #1
BNE ENIs2
JSR EnableNoiseB
RTS
ENIs2 JSR EnableNoiseC
RTS
; DisableNoise
DisableNoise
LDA noteChannel
BNE DNIs1
JSR DisableNoiseA
RTS
DNIs1 CMP #1
BNE DNIs2
JSR DisableNoiseB
RTS
DNIs2 JSR DisableNoiseC
RTS