Routines
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9260: Give both halves of a door the same sprite
Used by the routines at TIMED_DOOR_SHUT and DOOR_LOCKED_A.
Writes the sprite into the record IX points at, then flips bit 3 of the address -- the DOOR_OTHER_SIDE trick -- and writes it into the far half too. An open door has to look open from both rooms.
SET_BOTH_HALVES 9260 PUSH IX
9262 POP HL
9263 LD (HL),A
9264 EX AF,AF'
9265 LD A,L
9266 XOR $08
9268 LD L,A
9269 EX AF,AF'
926A LD (HL),A
926B RET
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