| Routines

FA79: Check whether there are any messages remaining in the message queue

Used by the routine at 6EC5. 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 7FB8)
FA79 | LD A,L | Point HL at the next message in the message queue
FA7A | SUB $07
FA7C | OR $08
FA7E | LD L,A
FA7F | LD A,(HL) | Pick up the number of the next message in the queue
FA80 | AND A | Set the zero flag if it's zero (no message)
FA81 | RET |