52 lines
511 B
ArmAsm
52 lines
511 B
ArmAsm
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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test_sound:
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lda KEYPRESS
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bpl test_sound
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bit KEYRESET
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jsr play_note
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jmp test_sound
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play_note:
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lda #$83
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sta smc1+1
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sta smc2+1
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note_loop:
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smc2:
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ldx #$83
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smc1:
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l86cb: cpx #$95
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beq l86e9
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bcc l86d8
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lda $C056 ; (lores)
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nop
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jmp l86dd
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l86d8: lda $C057 ; (hires)
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nop
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nop
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l86dd: inx
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bne l86f1
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lda $C030 ; speaker
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inc smc1+1
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bne note_loop
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rts
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l86e9: lda $c030 ; speaker
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lda $00
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jmp l86dd
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l86f1: lda $ffff
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lda $ffff
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lda $00
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jmp l86cb
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