Routines
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31887: Check whether a signal has been raised
Used by the routines at 31915, 32497 and 61555. Returns with the zero flag reset if the signal has been raised.
Input
A Event identifier
H Character number (183-209)
31887 CALL 31861 Convert the event ID into an appropriate bit mask
31890 AND (HL) Set the zero flag if the signal for this event hasn't been raised (HL=32640 or 32641)
31891 EX DE,HL Restore the character number to H
31892 RET Return with the zero flag set if the signal hasn't been raised
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