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42 lines
969 B
Plaintext
42 lines
969 B
Plaintext
; C02 sounds library assembly routines for VIC-20
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;beep() - Produce System Beep Sound
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;Affects: A,Y
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BEEP NOP ;Sound Bell
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;Uses VIA Timer 2...
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BEEPD: JSR $EF96 ;Delay YX Milliseconds
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DEX
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BPL BEEPD
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DEY
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BPL BEEPD
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RTS
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BEEPX: LDX #3 ;Turn off all Sound
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BEEPXL: LDA #0 ;Store 0 in all four
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STA $900A,X ; VIC Sound Registers
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DEX
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BPL BEEPXL
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RTS
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;bomb() - Produce System Explosion Sound
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;Affects: None
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BOMB: RTS ;Function Not Available
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;shoot() - Produce Shooting Sound
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;Affects: None
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SHOT: RTS ;Function Not Available
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;tick() - Produce System Tick Sound
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;Affects: None
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TICK: LDA $C030 ;Click Speaker Once
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RTS
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;tock() - Produce System Tock Sound
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;Affects: None
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TOCK: RTS ;Function Not Available
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;zap() - Produce System Zap Sound
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;Affects: None
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ZAP: RTS ;Function Not Available
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