Routines
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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
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