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Routines |
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Write 0 over the cached sprite bytes (*IX+9 to *IX+15) of each of the 24 actor slots, so that every actor is redrawn from scratch and no stale image is XORed off the redrawn screen. Bytes 0-8 are the actor itself and bytes 16-23 are state specific to its type, so they are left alone.
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Start at byte 9 of the first slot, 24585.
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| ClearSpriteCaches | 41717 | LD HL,24585 | HL=24585. | |
| 41720 | LD BC,1816 | Set B to 7 cache bytes per slot and C to 24 slots. | ||
| 41723 | LD DE,17 | DE=0017. | ||
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Clear the seven cache bytes of each slot in turn.
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| ClearSpriteCaches_Loop | 41726 | PUSH BC | Stash BC on the stack. | |
| ClearSpriteCaches_WriteByte | 41727 | LD (HL),0 | Write 0 to the current cache byte. | |
| 41729 | INC HL | Move onto the next cache byte. | ||
| 41730 | DJNZ ClearSpriteCaches_WriteByte | Decrease the inner counter by one and loop back to ClearSpriteCaches_WriteByte until this slot is clear. | ||
| 41732 | ADD HL,DE | Skip the rest of the slot. | ||
| 41733 | POP BC | Restore BC from the stack. | ||
| 41734 | DEC C | Decrease C by one. | ||
| 41735 | JR NZ,ClearSpriteCaches_Loop | Jump back to ClearSpriteCaches_Loop until C is zero. | ||
| 41737 | RET | Return. | ||
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