| Routines

64121: Check whether there are any messages remaining in the message queue

Used by the routine at 28357. Returns with the zero flag set if there are no messages remaining in the message queue.
Input
HL | Address of the current message in the message queue (see 32696)
64121 | LD A,L | Point HL at the next message in the message queue
64122 | SUB 7
64124 | OR 8
64126 | LD L,A
64127 | LD A,(HL) | Pick up the number of the next message in the queue
64128 | AND A | Set the zero flag if it's zero (no message)
64129 | RET |