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63437: Open a door
Used by the routine at 62120. Updates the play area graphics and screen refresh buffer (SRB) for a door so that it appears open.
Input
HL Address of the door status flags (see 32752)
63437 PUSH HL Save the address of the door status flags
63438 LD A,L A=240-249
63439 SUB 70 Point HL at the door knock status flags for the door (see 32682)
63441 LD L,A
63442 LD A,(HL) Reset the door knock status flags
63443 AND 63
63445 LD (HL),A
63446 POP HL Restore the address of the door status flags to HL
63447 JP 61696 Update the play area graphics and the SRB for the door
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