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Routines |
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Used by the routine at MakeTiles.
Compares a slot for a pick-up with a site, using the column, the row and the position. The result is that the zero flag is set if the slot holds the pick-up for the site, and is clear if not or if the slot is free.
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| CompareSlotWithSite | E03D | LD A,(IY+$00) | Read offset 00 of IY. | |||||||||||
| E040 | INC A | Advance A. | ||||||||||||
| E041 | JR Z,CompareSlotWithSite_Free | Jump to CompareSlotWithSite_Free if the zero flag is set. | ||||||||||||
| E043 | LD A,(IX+$00) | Read offset 00 of IX. | ||||||||||||
| E046 | CP (IY+$01) | Return if A is not the byte at offset 01 of IY. | ||||||||||||
| E049 | RET NZ | |||||||||||||
| E04A | LD A,(IX+$01) | Read offset 01 of IX. | ||||||||||||
| E04D | CP (IY+$04) | Return if A is not the byte at offset 04 of IY. | ||||||||||||
| E050 | RET NZ | |||||||||||||
| E051 | LD A,(IX+$02) | Read offset 02 of IX. | ||||||||||||
| E054 | CP (IY+$02) | Return if A is not the byte at offset 02 of IY. | ||||||||||||
| E057 | RET NZ | |||||||||||||
| E058 | LD A,(IX+$03) | Read offset 03 of IX. | ||||||||||||
| E05B | CP (IY+$05) | Compare A with the byte at offset 05 of IY. | ||||||||||||
| E05E | RET | Return. | ||||||||||||
| CompareSlotWithSite_Free | E05F | OR %00000001 | Set the bits of A that are set in 01. | |||||||||||
| E061 | RET | Return. | ||||||||||||
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