| Routines

6317: Determine whether a character should be moved (2)

Continues from 62B2. So far, byte 0x7B and bit 7 of byte 0x7A of the character's buffer have been adjusted to designate a new period of walking or running. All that remains is to ensure that bit 7 of byte 0x7A is set if the character is a teacher (teachers usually walk slowly).
Input
A | Contents of byte 0x7A of the character's buffer
H | Character number (0x98-0xAB)
L | 0x7A
6317 | AND $50 | Check bit 6 (always reset) and bit 4 (set for teachers) of byte 0x7A, and return (to move the character) if both are reset
6319 | RET Z
631A | SET 7,(HL) | Signal: walk slowly (the norm for teachers)
631C | RET | Return to the routine at 6226 to move the character