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Routines |
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Used by the routines at PlayAppearingSound, PlayJumpSound, PlaySoundFromObjectNumber, PlayMovingSound and PlayWaveSequence.
Plays a single beep by switching the speaker on, waiting, switching it off and waiting again. The bigger the pitch, the longer the beep.
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Hold the speaker on, then off.
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| PlaySquareWave | B702 | LD A,$10 | Turn the speaker on. | |||||
| B704 | OUT ($FE),A | |||||||
| B706 | LD A,B | Keep the pitch in A. | ||||||
| PlaySquareWave_FirstDelay | B707 | DJNZ PlaySquareWave_FirstDelay | Wait for the first half of the beep. | |||||
| B709 | LD B,A | Restore the pitch. | ||||||
| B70A | XOR A | Turn the speaker off. | ||||||
| B70B | OUT ($FE),A | |||||||
| B70D | LD A,B | Keep the pitch in A. | ||||||
| PlaySquareWave_SecondDelay | B70E | DJNZ PlaySquareWave_SecondDelay | Wait for the second half of the beep. | |||||
| B710 | LD B,A | Restore the pitch. | ||||||
| B711 | RET | Return. | ||||||
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View the equivalent code in;
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