| Routines

F91E: Check whether a character should enter a building or knock first

Used by the routine at ED8C. The character in question is standing at the entrance to a shop or other building, and his destination is somewhere inside. On entry, the zero flag is set if the entrance is open. Returns with A=3 (go up) if the entrance is open, or A=6 (knock or use a key) if it's closed.
Input
A | Location type indicator (see EB13)
H | Character number (0xD7-0xE6)
F91E | JR NZ,$F925 | Jump unless the entrance is open
F920 | LD L,$04 | Set the character's z-coordinate to 1 (he's indoors now)
F922 | LD (HL),$01
F924 | RET | Return to the caller of ED8C with A=3 (go up)
F925 | LD A,$06 | Return to the caller of ED8C with A=6 (knock on the door or use a key)
F927 | RET