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sid.s
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; Usage - +0 Init passing music driver address A0
; +4 Quit
; +8 Call per frame passing A0 (YM table)
values_store:
i set 0
rept 16
dc.l i
i set i+$01000000
endr
chan_a_sid_on: ds.b 1
chan_b_sid_on: ds.b 1
chan_c_sid_on: ds.b 1
even
sid_emu:
dc.b 'Grazey 3 Sid Voice Player.'
dc.b 'SID voices install on TA,TB,TD.'
dc.b 'Extensions by GGN and XiA'
dc.b 0
even
flag: dc.w 0
sid_ini:
bsr INITC
rts
sid_exit:
bsr CBACK
rts
sid_play:
bsr.s SIDEMU
if USE_SID_EVENTS
tstx.b chan_a_sid_on
bgt.s .skip_a
endif
moveq #0,d0
moveq #0,d1
move.b ((4*8)+2)(a0),d0
move.b ((4*1)+2)(a0),d1
lsl #8,d1
add.b ((4*0)+2)(a0),d1
bsr CALC_A
if USE_SID_EVENTS
.skip_a:
tstx.b chan_b_sid_on
bgt.s .skip_b
endif
clr.l d0
clr.l d1
move.b ((4*9)+2)(a0),d0
move.b ((4*3)+2)(a0),d1
lsl #8,d1
add.b ((4*2)+2)(a0),d1
bsr CALC_B
if USE_SID_EVENTS
.skip_b:
tstx.b chan_c_sid_on
bgt.s .skip_c
endif
clr.l d0
clr.l d1
move.b ((4*10)+2)(a0),d0
move.b ((4*5)+2)(a0),d1
lsl #8,d1
add.b ((4*4)+2)(a0),d1
bsr CALC_D
if USE_SID_EVENTS
.skip_c:
endif
RTS
* SID-Voice extension by Cream *
*-----------------------------------------------------------*
BASE:
SIDEMU:
; Spacing YM +2
; eg Reg 0 +0
; Reg 1 +2
spc equ 2
MOVE SR,-(SP)
MOVE #$2700,SR
LEA $FFFF8800.w,A1
movem.l (a0),d0-d7
or.w #$c000,d7
movem.l d0-d7,(a1)
MOVE.B ((4*8)+2)(A0),D1
MOVE.B ((4*9)+2)(A0),D2
MOVE.B ((4*10)+2)(A0),D3
if USE_SID_EVENTS
move.b #8,(a1)
tstx.b chan_a_sid_on
bgt.s .OK1 ;turn sid channel off
blt.s .NORAU0 ;turn sid channel on
move.b d1,2(a1) ;just write value to the PSG and don't touch timer
bra.s .channel_b
.chan_a_sid:
endif
.NORAU0:
BTST #3+8,D7
BNE.S .channel_b
MOVE.B #$08,(A1)
SUB.B #1,D1
BPL.S .OK1
MOVEQ #0,D1
.OK1:
MOVE.B D1,2(A1)
BSR NO_TA
.channel_b:
if USE_SID_EVENTS
move.b #9,(a1)
tstx.b chan_b_sid_on
bgt.s .OK2 ;turn sid channel off
blt.s .NORAU1 ;turn sid channel on
move.b d1,2(a1) ;just write value to the PSG and don't touch timer
bra.s .channel_c
.chan_b_sid:
endif
.NORAU1:
BTST #4+8,D7
BNE.S .channel_c
MOVE.B #$09,(A1)
SUB.B #1,D2
BPL.S .OK2
MOVEQ #0,D2
.OK2:
MOVE.B D2,2(A1)
BSR NO_TB
.channel_c:
if USE_SID_EVENTS
move.b #10,(a1)
tstx.b chan_c_sid_on
bgt.s .OK3 ;turn sid channel off
blt.s .NORAU2 ;turn sid channel on
move.b d1,2(a1) ;just write value to the PSG and don't touch timer
bra.s .NORAU3
.chan_c_sid:
endif
.NORAU2:
BTST #5+8,D7
BNE.S .NORAU3
MOVE.B #$0A,(A1)
SUB.B #1,D3
BPL.S .OK3
MOVEQ #0,D3
.OK3:
MOVE.B D3,2(A1)
BSR NO_TD
.NORAU3:
MOVE (SP)+,SR
RTS
INITC:
; Init timers for SID-Voice
MOVE SR,-(SP)
MOVEM.L A0/A4,-(SP)
LEA BASE(PC),A4
TST.W CFLAG-BASE(A4)
BNE NONEWC
MOVE.W #$0001,CFLAG-BASE(A4)
MOVE #$2700,SR
LEA RETTE(PC),A0
MOVE.L $00000134.w,(A0)+
MOVE.L $00000120.w,(A0)+
MOVE.L $00000110.w,(A0)+
move.B $FFFFFA07.w,(A0)+
move.B $FFFFFA09.w,(A0)+
move.B $FFFFFA13.w,(A0)+
move.B $FFFFFA15.w,(A0)+
move.B $FFFFFA17.w,(A0)+
move.B $FFFFFA19.w,(A0)+ ;TA control
move.B $FFFFFA1B.w,(A0)+ ;TB control
move.B $FFFFFA1D.w,(A0)+ ;TD control
BCLR #1,$FFFFFA07.w
ANDI.B #$F0,$FFFFFA19.w ;stop a
CLR.B $FFFFFA1B.w ;stop b
ANDI.B #$F0,$FFFFFA1D.w ;stop d
move.B $FFFFFA1F.w,(A0)+ ;TA Data
move.B $FFFFFA21.w,(A0)+ ;TB Data
move.B $FFFFFA25.w,(A0)+ ;TD Data
lea TIMER_A1(pc),a0
lea TIMER_B1(pc),a1
lea TIMER_D1(pc),a2
MOVE.L a0,$00000134.w
MOVE.L a1,$00000120.w
MOVE.L a2,$00000110.w
move.B #$08,$FFFFFA19.w
move.B #$08,$FFFFFA21.w
move.B #$08,$FFFFFA25.w
BSET #5,$FFFFFA07.w ; Enable Timer A
BSET #5,$FFFFFA13.w
BSET #0,$FFFFFA07.w ; Enable Timer B
BSET #0,$FFFFFA13.w
BSET #4,$FFFFFA09.w ; Enable Timer D
BSET #4,$FFFFFA15.w
BCLR #$03,$FFFFFA17.w ; Automatic EOI
NONEWC: MOVEM.L (SP)+,A0/A4
MOVE (SP)+,SR
RTS
CBACK: MOVE SR,-(SP)
MOVEM.L D0/A0/A4,-(SP)
LEA BASE(PC),A4
TST.W CFLAG-BASE(A4)
BEQ.S NOCBACK
CLR.W CFLAG-BASE(A4)
MOVE #$2700,SR
LEA RETTE(PC),A0
MOVE.L (A0)+,$00000134.w
MOVE.L (A0)+,$00000120.w
MOVE.L (A0)+,$00000110.w
move.B (A0)+,$FFFFFA07.w
move.B (A0)+,$FFFFFA09.w
move.B (A0)+,$FFFFFA13.w
move.B (A0)+,$FFFFFA15.w
move.B (A0)+,$FFFFFA17.w
move.B (A0)+,$FFFFFA19.w
move.B (A0)+,$FFFFFA1B.w
move.B (A0)+,D0
AND.B #$0F,D0
ANDI.B #$F0,$FFFFFA1D.w
OR.B D0,$FFFFFA1D.w
MOVE.B (A0)+,$FFFFFA1F.w
MOVE.B (A0)+,$FFFFFA21.w
MOVE.B (A0)+,$FFFFFA25.w
NOCBACK:
MOVEM.L (SP)+,D0/A0/A4
MOVE (SP)+,SR
RTS
CFLAG: DC.W 0
RETTE: DS.L 10
DUMMYC: DC.W 0
CALC_A: ; Timer routs
AND.L #$00000FFF,D1
CMP.W #$0010,D1
BLE.S NO_TA
lea TIMER_A1+4(pc),a6
MOVE.B D0,(a6)
LEA TIMER_TAB(PC),A2
CLR.L D2
AGAIN_TIMER: CMP.W (A2),D1
BLT.S USE_TIMER
LEA 6(A2),A2
BRA.S AGAIN_TIMER
USE_TIMER:
MOVE.W 2(A2),D2 ;MFP - Vorteiler
MOVE.L #160822,D0
DIVU D2,D0 ;/ Vorteiler
MULU D1,D0 ;* Periode
ADD.L #$00002000,D0 ;Finetuning
LSL.L #2,D0
SWAP D0 ;/131072 (PSG Takt -> swap)
MOVE.W 4(A2),D1
move.B D0,$FFFFFA1F.w ;
move.B D1,$FFFFFA19.w ;
RTS
NO_TA: ANDI.B #$F0,$FFFFFA19.w
RTS
TIMER_TAB:
DC.W $0068,$0004,$0001 ;
DC.W $0105,$000A,$0002 ;
DC.W $01A2,$0010,$0003 ;
DC.W $051A,$0032,$0004 ;
DC.W $0688,$0040,$0005 ;
DC.W $0A35,$0064,$0006 ;
DC.W $0EEF,$00C8,$0007 ;
DC.W $1000,$00C8,$0007 ;
DC.W $FFFF
TIMER_A1:
move.L #$08000000,$FFFF8800.w
add.l #$12,$134.w
RTE
TIMER_A2:
move.L #$08000000,$FFFF8800.w
sub.l #$12,$134.w
RTE
CALC_B:
MAKE_TIMER_B:
AND.L #$00000FFF,D1
CMP.W #$0010,D1
BLE.S NO_TB
lea TIMER_B1+4(pc),a6
move.b d0,(a6)
LEA TIMER_TAB(PC),A2
CLR.L D2
AGAIN_TB:
CMP.W (A2),D1
BLT.S USE_TBX
LEA 6(A2),A2
BRA.S AGAIN_TB
USE_TBX:
MOVE.W 2(A2),D2 ;MFP - Vorteiler
MOVE.L #160822,D0
DIVU D2,D0 ;/ Vorteiler
MULU D1,D0 ;* Periode
ADD.L #$00002000,D0 ;Finetuning
LSL.L #2,D0
SWAP D0 ;/131072 (PSG Takt -> swap)
MOVE.W 4(A2),D1
move.B $FFFFFA1B.w,D2
ANDI.B #$F0,D2
OR.B D1,D2
move.B D0,$FFFFFA21.w ;38
move.B D2,$FFFFFA1B.w ;1
RTS
NO_TB: ANDI.B #$F0,$FFFFFA1B.w
RTS
TIMER_B1:
move.L #$09000000,$FFFF8800.w
add.l #$12,$120.w
RTE
TIMER_B2:
move.L #$09000000,$FFFF8800.w
sub.l #$12,$120.w
RTE
CALC_D:
MAKE_TIMER_D:
AND.L #$00000FFF,D1
CMP.W #$0010,D1
BLE.S NO_TD
lea TIMER_D1+4(pc),a6
move.b d0,(a6)
LEA TIMER_TAB(PC),A2
CLR.L D2
AGAIN_TD:
CMP.W (A2),D1
BLT.S USE_TDX
LEA 6(A2),A2
BRA.S AGAIN_TD
USE_TDX:
MOVE.W 2(A2),D2 ;MFP - Vorteiler
MOVE.L #160822,D0
DIVU D2,D0 ;/ Vorteiler
MULU D1,D0 ;* Periode
ADD.L #$00002000,D0 ;Finetuning
LSL.L #2,D0
SWAP D0 ;/131072 (PSG Takt -> swap)
MOVE.W 4(A2),D1
move.B D0,$FFFFFA25.w ;
ANDI.B #$F0,$FFFFFA1D.w
OR.B D1,$FFFFFA1D.w
RTS
NO_TD: ANDI.B #$F0,$FFFFFA1D.w
RTS
TIMER_D1:
move.L #$0A000000,$FFFF8800.w
add.l #$12,$110.w
RTE
TIMER_D2:
move.L #$0A000000,$FFFF8800.w
sub.l #$12,$110.w
RTE
endmus: