| Routines

F820: Make a character walk up and down for a while

Used by the command lists at FDA0, FDB4, FDC4, FDD0, FDEA, FDF8, FE14, FE34, FE49, FE9A and FEA0.
Input
H | Character number (0xD7-0xE5)
F820 | LD L,$0B | Set the door identifier in byte 0x0B of the character's buffer to 0xA8 (which corresponds to no door, meaning the character will not be on door duty)
F822 | LD (HL),$A8
F824 | INC L | Set the walkabout duration counter in byte 0x0C of the character's buffer to 0xFF (meaning the character will walk up and down for a finite period instead of indefinitely)
F825 | LD (HL),$FF
F827 | JP $F74D | Make the character begin walking up and down