154 lines
4.4 KiB
Forth
154 lines
4.4 KiB
Forth
\ PS2! c c p-addr -- Data byte (A), high address byte (B), port address (C) - OUT to port with A and B registers set
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: PC2! SWAP >< OR PC! ;
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\ SID! c c -- Data value, register (0-31); bits 5,6 are for interrupt settings; bit 7 (/CS) is handled
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: SID!
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2DUP 128 OR 84 PC2!
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2DUP 127 AND 84 PC2!
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128 OR 84 PC2! ;
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\ Voice control register flags
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: SID:CTL:GATE 1 ;
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: SID:CTL:SYNC3 2 ;
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: SID:CTL:RING3 4 ;
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: SID:CTL:TEST 8 ;
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: SID:CTL:TRI 16 ;
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: SID:CTL:SAW 32 ;
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: SID:CTL:PWM 64 ;
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: SID:CTL:NOISE 128 ;
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\ Voice 1
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\ Reg 0,1 - frequency voice 1
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: SID0/1:FREQ! DUP 255 AND 0 SID! >< 255 AND 1 SID! ;
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\ Reg 2,3 - pulse wave duty cycle voice 2
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: SID2/3:PWM! DUP 255 AND 2 SID! >< 15 AND 3 SID! ;
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\ Reg 4 - control register voice 1
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: SID4! 4 SID! ;
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\ Reg 5 - attack duration / decay duration voice 1
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: SID5:ATK/DEC! 15 AND SWAP 4 LSHIFT OR 5 SID! ;
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\ Reg 6 - sustain level / release duration voice 1
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: SID6:SUS/REL! 15 AND SWAP 4 LSHIFT OR 6 SID! ;
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\ Voice 2
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\ Reg 7,8 - frequency voice 2
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: SID7/8:FREQ! DUP 255 AND 7 SID! >< 15 AND 8 SID! ;
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\ Reg 9,10 - pulse wave duty cycle voice 2
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: SID9/10:PWM! DUP 255 AND 9 SID! >< 255 AND 10 SID! ;
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\ Reg 10 - control register voice 2
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: SID11! 11 SID! ;
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\ Reg 12 - attack duration / decay duration voice 2
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: SID12:ATK/DEC! 15 AND SWAP 4 LSHIFT OR 12 SID! ;
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\ Reg 13 - sustain level / release duration voice 2
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: SID13:SUS/REL! 15 AND SWAP 4 LSHIFT OR 13 SID! ;
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\ Voice 3
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\ Reg 14,15 - frequency voice 3
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: SID14/15:FREQ! DUP 255 AND 14 SID! >< 15 AND 15 SID! ;
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\ Reg 16,17 - pulse wave duty cycle voice 3
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: SID16/17:PWM! DUP 255 AND 16 SID! >< 255 AND 17 SID! ;
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\ Reg 18 - control register voice 18
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: SID18! 18 SID! ;
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\ Reg 19 - attack duration / decay duration voice 3
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: SID19:ATK/DEC! 15 AND SWAP 4 LSHIFT OR 19 SID! ;
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\ Reg 20 - sustain level / release duration voice 3
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: SID20:SUS/REL! 15 AND SWAP 4 LSHIFT OR 20 SID! ;
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\ Filters
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\ Reg 21/22 - filter cutoff frequency (0 - 2047 / 11 bits)
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: SID21/22:CUT! DUP 7 AND 21 SID! 3 RSHIFT 255 AND 22 SID! ;
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\ Reg 23 - filter resonance (0 - 15 / 4 bits) / ext, voice 3, voice 2, voice 1
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: SID23:RES 15 AND 4 LSHIFT ;
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: SID23:V1 1 OR ;
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: SID23:V2 2 OR ;
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: SID23:V3 4 OR ;
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: SID23:EXT 8 OR ;
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: SID23! 23 SID! ;
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\ Reg 24 - filter mode and main volume control
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: SID24:VOL 15 AND ;
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: SID24:LOWPASS 16 OR ;
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: SID24:BANDPASS 32 OR ;
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: SID24:HIGHPASS 64 OR ;
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: SID24:MUTEVOICE3 128 OR ;
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: SID24! 24 SID! ;
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\ SID:RST -- Put SID chip in known state
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: SID:RST
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4389 SID0/1:FREQ! 0 SID4! 4 2 SID5:ATK/DEC! 10 9 SID6:SUS/REL! 2048 SID2/3:PWM!
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4389 SID7/8:FREQ! 0 SID11! 4 2 SID12:ATK/DEC! 10 9 SID13:SUS/REL! 2048 SID9/10:PWM!
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4389 SID14/15:FREQ! 0 SID18! 4 2 SID19:ATK/DEC! 10 9 SID20:SUS/REL! 2048 SID16/17:PWM!
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1024 SID21/22:CUT! 10 SID23:RES SID23!
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15 SID24:VOL SID24! ;
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\ Frequency table:
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: SID:NOTE:C4 4389 ;
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: SID:NOTE:C4# 4650 ;
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: SID:NOTE:D4 4927 ;
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: SID:NOTE:D4# 5220 ;
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: SID:NOTE:E4 5530 ;
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: SID:NOTE:F4 5859 ;
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: SID:NOTE:F4# 6207 ;
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: SID:NOTE:G4 6577 ;
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: SID:NOTE:G4# 6968 ;
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: SID:NOTE:A4 7382 ;
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: SID:NOTE:A4# 7821 ;
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: SID:NOTE:B4 8286 ;
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\ Octave shifts
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: SID:OCT:UP 2* ;
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: SID:OCT:DOWN 2/ ;
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\ Voice contorl registers
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VARIABLE SID:V1:CTL
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: SID:V1:CTL! SID:V1:CTL ! ;
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: SID:V1:NOTE:ON SID0/1:FREQ! SID:V1:CTL @ SID:CTL:GATE OR SID4! ;
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: SID:V1:NOTE:OFF SID:V1:CTL @ SID:CTL:GATE INVERT AND SID4! ;
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VARIABLE SID:V2:CTL
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: SID:V2:CTL! SID:V2:CTL ! ;
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: SID:V2:NOTE:ON SID7/8:FREQ! SID:V2:CTL @ SID:CTL:GATE OR SID11! ;
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: SID:V2:NOTE:OFF SID:V2:CTL @ SID:CTL:GATE INVERT AND SID11! ;
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VARIABLE SID:V3:CTL
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: SID:V3:CTL! SID:V3:CTL ! ;
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: SID:V3:NOTE:ON SID14/15:FREQ! SID:V3:CTL @ SID:CTL:GATE OR SID18! ;
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: SID:V3:NOTE:OFF SID:V3:CTL @ SID:CTL:GATE INVERT AND SID18! ;
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: STEP 100 0 DO LOOP ;
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: DELAY 10000 0 DO LOOP ;
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: SID:V1:TEST:NOTE
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SID:CTL:TRI SID:V1:CTL!
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SID:NOTE:C4 SID:V1:NOTE:ON
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DELAY DELAY
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SID:V1:NOTE:OFF
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: SID:V2:TEST:NOTE
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SID:CTL:SAW SID:V2:CTL!
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SID:NOTE:D4 SID:V2:NOTE:ON
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DELAY DELAY
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SID:V2:NOTE:OFF
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: SID:V3:TEST:NOTE
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SID:CTL:PWM SID:V3:CTL!
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SID:NOTE:E4 SID:V3:NOTE:ON
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DELAY DELAY
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SID:V3:NOTE:OFF
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: SID:TEST:MELODY
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SID:V1:TEST:NOTE
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SID:V2:TEST:NOTE
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SID:V3:TEST:NOTE ;
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: SID:TEST:FILTER
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10 SID23:RES SID23:V1 SID23:V2 SID23:V3 SID23:EXT SID23!
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SID:CTL:PWM SID:V3:CTL! SID:NOTE:D4 SID:V3:NOTE:ON
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2047 0 DO I SID21/22:CUT! 1 +LOOP
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SID:V3:NOTE:OFF ;
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SID:RST
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SID:TEST:MELODY
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15 SID24:VOL SID24:LOWPASS SID24!
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SID:TEST:FILTER
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15 SID24:VOL SID24:BANDPASS SID24!
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SID:TEST:FILTER
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15 SID24:VOL SID24:HIGHPASS SID24!
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SID:TEST:FILTER
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