Contact Sam Cruise: Routine at F346

F346: Control a character who is knocking on or opening a door (1)

The address of this interruptible subcommand routine is placed into bytes 0x0E and 0x0F of a character's buffer by the routine at F338. It makes the character open the door if he can, or knock and begin waiting for an answer.

Input
H	Character number (0xD7-0xE5)

F346

CALL $F2A8

Check whether the character can open the door, and open it if so

F349

LD L,$10

Point HL at byte 0x10 of the character's buffer

F34B

JR NC,$F375

Jump if the character has opened the door

F34D

JR Z,$F375

Jump if the character has no keys (only policemen have no keys)

This character (who is not a policeman) has knocked on the door.

F34F

LD (HL),E

Store the LSB of the address of the door knock status flags (see 7FAA) for the door in byte 0x10 of the character's buffer

F350

INC L

Initialise the counter in byte 0x11 of the character's buffer to 0x1E; this determines how long the character will wait for someone to open the door before giving up

F351

LD (HL),$1E

F353

LD L,$0E

Change the address of the interruptible subcommand routine in bytes 0x0E and 0x0F of the character's buffer to F359

F355

LD (HL),$59

F357

JR $F37B

Lower the character's arm