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Routines |
| Prev: AF5F | Up: Map | Next: AF76 |
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Plays one pulse, which is a high and a low half of the same length, by toggling the speaker. B is unchanged.
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Turn the speaker on for the length of the pulse.
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| PlaySquareWave | AF66 | LD A,$10 | Set the speaker bit. | |||||
| AF68 | OUT ($FE),A | Turn the speaker on. | ||||||
| AF6A | LD A,B | Keep the length of the pulse in A. | ||||||
| PlaySquareWave_FirstDelay | AF6B | DJNZ PlaySquareWave_FirstDelay | Wait for the length of the pulse. | |||||
| AF6D | LD B,A | Restore the length of the pulse. | ||||||
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Turn the speaker off for the same length.
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| AF6E | XOR A | Clear the speaker bit. | ||||||
| AF6F | OUT ($FE),A | Turn the speaker off. | ||||||
| AF71 | LD A,B | Keep the length of the pulse in A. | ||||||
| PlaySquareWave_SecondDelay | AF72 | DJNZ PlaySquareWave_SecondDelay | Wait for the length of the pulse. | |||||
| AF74 | LD B,A | Restore the length of the pulse. | ||||||
| AF75 | RET | Return. | ||||||
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View the equivalent code in;
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