flyer: save 1 byte
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53f9fc0bc2
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27bfa9d049
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@ -40,17 +40,11 @@ ay3_irq_handler:
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bit MOCK_6522_T1CL
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; drop note down after first
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; drop note down after first (rudimentary envelope)
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lda #$C
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sta AY_REGS+8
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sta AY_REGS+10
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; lda #$0E
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; sta AY_REGS+8 ; $08 volume A
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; lda #$0C
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; sta AY_REGS+9 ; $09 volume B
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; sta AY_REGS+10 ; $0A volume C
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sta AY_REGS+8 ; Channel A
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sta AY_REGS+9 ; Channel B
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;============================
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; see if still counting down
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@ -85,39 +79,27 @@ set_notes_loop:
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all_ok:
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; see if note
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; tay
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; and #$C0
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; cmp #$C0
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; beq handle_timing
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handle_note:
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note_only:
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; tya
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; NNNNNLLC -- c=channel, n=note
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tay
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tay ; save in Y
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ldx #0
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and #1
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asl
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tax ; channel A/B*2 in X
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tya
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lsr
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bcc channel_a
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ldx #4 ; skip to C
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channel_a:
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and #$3
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sta SONG_COUNTDOWN
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; inc SONG_COUNTDOWN
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tya
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lsr
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lsr
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lsr
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; and #$FE ; fine register value, want in X
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; tax
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; tya ; get note
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; and #$1F
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tay ; lookup in table
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lda frequencies_low,Y
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@ -127,7 +109,7 @@ channel_a:
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sta AY_REGS+1,X
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lda #$F
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sta AY_REGS+8
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sta AY_REGS+8 ; volume A
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;============================
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; point to next
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