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Routines |
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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 | 44902 | LD A,16 | Set the speaker bit. | |||||
| 44904 | OUT (254),A | Turn the speaker on. | ||||||
| 44906 | LD A,B | Keep the length of the pulse in A. | ||||||
| PlaySquareWave_FirstDelay | 44907 | DJNZ PlaySquareWave_FirstDelay | Wait for the length of the pulse. | |||||
| 44909 | 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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| 44910 | XOR A | Clear the speaker bit. | ||||||
| 44911 | OUT (254),A | Turn the speaker off. | ||||||
| 44913 | LD A,B | Keep the length of the pulse in A. | ||||||
| PlaySquareWave_SecondDelay | 44914 | DJNZ PlaySquareWave_SecondDelay | Wait for the length of the pulse. | |||||
| 44916 | LD B,A | Restore the length of the pulse. | ||||||
| 44917 | RET | Return. | ||||||
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View the equivalent code in;
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