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7C8F: Check whether a signal has been raised
Used by the routines at 7CAB, 7EF1 and F073. Returns with the zero flag reset if the signal has been raised.
A Event identifier
H Character number (0xB7-0xD1)
7C8F CALL $7C75 Convert the event ID into an appropriate bit mask
7C92 AND (HL) Set the zero flag if the signal for this event hasn't been raised (HL=7F80 or 7F81)
7C93 EX DE,HL Restore the character number to H
7C94 RET Return with the zero flag set if the signal hasn't been raised
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