Routines
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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
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