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Routines |
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Used by the routine at UpdateType19.
Used by an object while it moves. Does nothing on even frames. If bit 6 of offset 22 of the object is clear it plays a short sweep. If not it plays a different sweep, but only once every four frames.
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| PlayMovingSound | 29301 | LD A,(39524) | The frame counter. | |||||
| 29304 | AND %00000001 | Keep the bits of A that are set in 1. | ||||||
| 29306 | RET Z | Return if the zero flag is set. | ||||||
| 29307 | LD C,4 | The short sweep has four beeps. | ||||||
| 29309 | LD D,15 | Its lowest beep has half-period 15. | ||||||
| 29311 | BIT 6,(IX+22) | Jump to PlaySweep if bit 6 of offset 22 of IX is clear. | ||||||
| 29315 | JP Z,PlaySweep | |||||||
| 29318 | LD A,(39524) | The frame counter. | ||||||
| 29321 | AND %00000011 | Keep the bits of A that are set in 3. | ||||||
| 29323 | RET NZ | Return if the zero flag is clear. | ||||||
| 29324 | LD C,3 | The other sweep has three beeps. | ||||||
| 29326 | LD D,27 | Its lowest beep has half-period 27. | ||||||
| 29328 | JP PlaySweep | Jump to PlaySweep. | ||||||
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