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Routines |
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Used by the routines at PlayNoise and PlaySquareWave.
Flips the speaker bit (bit 4) of the value held at SoundStore and writes the result to port FE. The lower bits of the value set the border colour.
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| PlaySound | 60FB | LD A,($5E47) | Fetch the speaker and border state from SoundStore. | |
| 60FE | XOR %00010000 | Flip bit 4 (the speaker). | ||
| 6100 | LD ($5E47),A | Write the new speaker and border state back to SoundStore. | ||
| 6103 | OUT ($FE),A | Write the state to port FE which sets the speaker and the border colour. | ||
| 6105 | RET | Return. | ||
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