302 lines
5.9 KiB
ArmAsm
302 lines
5.9 KiB
ArmAsm
; ZZ points to offset from pointer
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;D000 ;0 $9000,$9100,$9200 = A Low (reg0)
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;D100 ;1 $9300,$9400,$9500 = A high (reg1) [top], B high (reg3) [bottom]
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;D200 ;2 $9600,$9700,$9800 = B Low (reg2)
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;D300 ;3 $9900,$9A00,$9B00 = C Low (reg4)
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;D400 ;4 $9C00,$9D00,$9E00 = Envelope Shape (r13) [top], C high (reg5) [bot]
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;D500 ;5 $9F00,$A000,$A100 = Noise (r6), bit7 = don't change envelope
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;D600 ;6 $A200,$A300,$A400 = Enable (r7)
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;D700 ;7 $A500,$A600,$A700 = A amp (r8), bit 5 of r8,r9,r10
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;D800 ;8 $A800,$A900,$AA00 = C amp (r10) [top], B amp (r9) [bottom]
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;D900 ;9 $AB00,$AC00,$AD00 = ENV low (r11)
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;DA00 ;a $AE00,$AF00,$B000 = ENV high (r12)
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; 3+ 72 + 72 + 83 + 74 + 72 + 77 + 19 + 70 + 74 + 72 +
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; 77 + 18 + 82 + 85 + 72 + 72 + 10 + 127 + 6 = 1237 /////1180
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play_frame_compressed:
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ldy FRAME_PLAY_OFFSET ; 3
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; Register 0: A fine
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ldx #0 ; 2
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r0_smc:
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lda $D000,Y ; 4+
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jsr play_mb_write ; 6+60
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;======
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; 72
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; Register 2: B fine
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ldx #2 ; 2
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r2_smc:
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lda $D200,Y ; 4+
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jsr play_mb_write ; 6+60
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;======
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; 72
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; Register 1: A coarse
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ldx #1 ; 2
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r1_smc:
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lda $D100,Y ; 4+
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pha ; 3
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lsr ; 2
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lsr ; 2
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lsr ; 2
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lsr ; 2
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jsr play_mb_write ; 6+60
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;======
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; 83
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; Register 3: B low
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ldx #3 ; 2
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pla ; 4
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and #$f ; 2
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jsr play_mb_write ; 6+60
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;======
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; 74
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; Register 4: C fine
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ldx #4 ; 2
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r4_smc:
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lda $D300,Y ; 4+
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jsr play_mb_write ; 6+60
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;=======
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; 72
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; Register 5: C coarse
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ldx #5 ; 2
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r13_smc:
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lda $D400,Y ; 4+
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pha ; 3
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and #$f ; 2
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jsr play_mb_write ; 6+60
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;========
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; 77
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; Register 13: E type
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pla ; 4
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lsr ; 2
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lsr ; 2
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lsr ; 2
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lsr ; 2
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r5_smc:
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ldx $D500,Y ; check for env update ; 4
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bmi skip_envelope_write ; 3
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;============
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; 19
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; -1
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ldx #13 ; 2
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jsr play_mb_write ; 6+60
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jmp done_envelope_write ; 3
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;=====
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; 70
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skip_envelope_write:
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; KILL CYCLES... Need to kill 70
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; delay 25+a (so 70-2-25=43)
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lda #43 ; 2
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jsr delay_a ; 25+43
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;======
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; 70
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done_envelope_write:
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; Register 6: Noise
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ldx #6 ; 2
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r6_smc:
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lda $D500,Y ; 4+
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and #$1f ; 2
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jsr play_mb_write ; 6+60
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;=======
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; 74
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; Register 7: Enable
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ldx #7 ; 2
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r7_smc:
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lda $D600,Y ; 4+
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jsr play_mb_write ; 6+60
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;========
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; 72
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; Register 8: a-amp
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ldx #8 ; 2
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r8_smc:
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lda $D700,Y ; 4+
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pha ; 3
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and #$1f ; 2
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jsr play_mb_write ; 6+60
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;=======
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; 77
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pla ; 4
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and #$e0 ; 2
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lsr ; 2
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sta AY_WRITE_TEMP ; 3
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lsr ; 2
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and #$10 ; 2
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sta AY_WRITE_TEMP2 ; 3
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;====
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; 18
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; Register 9: b-amp (bottom)
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ldx #9 ; 2
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r9_smc:
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lda $D800,Y ; 4+
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pha ; 3
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and #$f ; 2
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ora AY_WRITE_TEMP ; 3
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and #$1f ; 2
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jsr play_mb_write ; 6+60
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;=======
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; 82
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; Register 10: c-amp (top)
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ldx #10 ; 2
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pla ; 4
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lsr ; 2
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lsr ; 2
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lsr ; 2
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lsr ; 2
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ora AY_WRITE_TEMP2 ; 3
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and #$1f ; 2
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jsr play_mb_write ; 6+60
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;======
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; 85
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; Register 11: E fine
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ldx #11 ; 2
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r11_smc:
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lda $D900,Y ; 4+
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jsr play_mb_write ; 6+60
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;======
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; 72
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; Register 12: E coarse
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ldx #12 ; 2
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r12_smc:
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lda $DA00,Y ; 4+
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jsr play_mb_write ; 6+60
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;======
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; 72
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; incrememnt offset
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; wrap to next
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iny ; 2
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sty FRAME_PLAY_OFFSET ; 3
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cpy #59*3 ; FIXME: song specific ; 2
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beq frame_wrap ; 3
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;==========
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; 10
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no_frame_wrap:
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; -1
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; delay 127+1-3=125
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lda #98 ; 2
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jsr delay_a ; 125-2-25=98
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jmp done_frame_wrap ; 3
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frame_wrap:
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lda #0 ; 2
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sta FRAME_PLAY_OFFSET ; 3
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inc FRAME_PLAY_PAGE ; 5
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jsr update_pt3_play ; 6+111
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;=====
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; 127
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done_frame_wrap:
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rts ; 6
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;========================
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; 28+26+6= 60
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; trashes A,X
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play_mb_write:
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; address
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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ldx #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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stx MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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stx MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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ldx #MOCK_AY_INACTIVE ; go inactive ; 2
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stx MOCK_6522_ORB1 ; 4
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stx MOCK_6522_ORB2 ; 4
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;===========
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; 28
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; value
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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stx MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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stx MOCK_6522_ORB2 ; 4
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;===========
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; 26
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rts ; 6
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;===========================
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; update the SMC counters
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; 13+92+6=111
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update_pt3_play:
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lda FRAME_PLAY_PAGE ; 3
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asl ; 2
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asl ; 2
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asl ; 2
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asl ; 2
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tay ; 2
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;===
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; 13
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lda music_addr_table+0,Y ; 4
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sta r0_smc+2 ; 4 ; D0
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lda music_addr_table+1,Y ; 4
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sta r1_smc+2 ; 4 ; D1
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lda music_addr_table+2,Y ; 4
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sta r2_smc+2 ; 4 ; D2
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lda music_addr_table+3,Y ; 4
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sta r4_smc+2 ; 4 ; D3
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lda music_addr_table+4,Y ; 4
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sta r13_smc+2 ; 4 ; D4
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lda music_addr_table+5,Y ; 4
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sta r5_smc+2 ; 4 ; D5
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sta r6_smc+2 ; 4 ; D5
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lda music_addr_table+6,Y ; 4 ; D6
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sta r7_smc+2 ; 4
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lda music_addr_table+7,Y ; 4 ; D7
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sta r8_smc+2 ; 4
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lda music_addr_table+8,Y ; 4 ; D8
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sta r9_smc+2 ; 4
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lda music_addr_table+9,Y ; 4 ; D9
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sta r11_smc+2 ; 4
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lda music_addr_table+10,Y ; 4 ; DA
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sta r12_smc+2 ; 4
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;==========
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; 11*8+4 = 92
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rts ; 6
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