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Routines |
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Used by the routine at HandlerCar.
Steps through the first 0400 bytes of the ROM and flips the speaker, using PlaySound, for every byte which has bit 4 set. The ROM contents are used as a source of noise. This is the sound made when an opponent car hits an obstacle.
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| PlayNoise | 6106 | LD HL,$0000 | Point HL at the start of the ROM, which is the source of the noise. | |
| 6109 | LD BC,$0400 | Set the byte counter to 0400. | ||
| PlayNoise_Loop | 610C | LD A,(HL) | Fetch the next ROM byte. | |
| 610D | INC HL | Move on to the next ROM byte. | ||
| 610E | AND %00010000 | Keep only bit 4. | ||
| 6110 | JR Z,PlayNoise_Next | Jump to PlayNoise_Next if bit 4 is not set. | ||
| 6112 | CALL PlaySound | Flip the speaker using PlaySound. | ||
| PlayNoise_Next | 6115 | DEC BC | Decrease the byte counter by one. | |
| 6116 | LD A,B | Loop back to PlayNoise_Loop until all 0400 bytes have been used. | ||
| 6117 | OR C | |||
| 6118 | JR NZ,PlayNoise_Loop | |||
| 611A | RET | Return. | ||
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