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Routines |
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A door is held as two 8-byte entities, one for each of the two rooms that it joins, and these are 08 bytes apart with one of them on an address that has bit 3 reset. This flips bit 3 of IX to get the other.
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| GetOtherDoorHalf | 9286 | PUSH IX | Copy IX into HL. | |||||||||
| 9288 | POP HL | |||||||||||
| 9289 | LD A,L | Fetch the low byte of the address of this half. | ||||||||||
| 928A | XOR %00001000 | Flip bit 3. | ||||||||||
| 928C | LD L,A | Keep the address of the other half of the door in L. | ||||||||||
| 928D | PUSH HL | Copy HL into IX, as the other half of the door. | ||||||||||
| 928E | POP IX | |||||||||||
| 9290 | RET | Return. | ||||||||||
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