| Routines

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