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Routines |
| Prev: 9BA9 | Up: Map | Next: 9BCA |
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Used by the routines at ROOM_NAME_AT, CAN_PASS, LOOK_THROUGH, DESCRIBE_ROOM, DESCRIBE_LOCATION, DESCRIBE_BRIEFLY, ROOM_LEFT, ACTOR_ROOM, ROOM_BY_NAME, EXITS_OF, DRAGON_HUNTS and ELROND_READS_MAP.
Anything from $50 up is not a location and gets zero back; otherwise the record's address is read straight out of ROOM_POINTERS, two bytes per location. Unlike objects there is no search: locations are numbered densely, so a table indexed by number is cheaper than FIND_RECORD.
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| GET_ROOM | 9BB1 | CP $50 | $50 and above is not a location: return zero | |||||||||
| 9BB3 | JR C,GET_ROOM_0 | |||||||||||
| 9BB5 | XOR A | |||||||||||
| 9BB6 | RET | |||||||||||
| GET_ROOM_0 | 9BB7 | PUSH DE | DE = ROOM_POINTERS, keeping HL | |||||||||
| 9BB8 | LD DE,ROOM_POINTERS | |||||||||||
| 9BBB | PUSH HL | |||||||||||
| 9BBC | LD L,A | HL = ROOM_POINTERS + 2 x location | ||||||||||
| 9BBD | LD H,$00 | |||||||||||
| 9BBF | ADD HL,HL | |||||||||||
| 9BC0 | ADD HL,DE | |||||||||||
| 9BC1 | LD E,(HL) | DE = the pointer there | ||||||||||
| 9BC2 | INC HL | |||||||||||
| 9BC3 | LD D,(HL) | |||||||||||
| 9BC4 | PUSH DE | IX = the room's record | ||||||||||
| 9BC5 | POP IX | |||||||||||
| 9BC7 | POP HL | |||||||||||
| 9BC8 | POP DE | |||||||||||
| 9BC9 | RET | |||||||||||
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