| jetpac | Routines |
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| 67db | djnz $67db | Play sound/silence for desired length | ||||||||
| 67dd | xor a | Turn speaker OFF for desired duration | ||||||||
| 67de | out ($fe),a | |||||||||
| 67e0 | ld b,d | |||||||||
| 67e1 | djnz $67e1 | |||||||||
| 67e3 | dec c | Decrement duration | ||||||||
| 67e4 | jr nz,$67d6 | Repeat until duration is zero | ||||||||
| 67e6 | ret | |||||||||
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