Routines
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7CA1: Lower the signal for a certain event (unused)
This routine is not used.
Input
H Character number (0xB7-0xD1)
7CA1 CALL $627D Get the next byte (the event ID) from the command list
7CA4 CALL $7C75 Convert the event ID into an appropriate bit mask
7CA7 CPL Set all but the event bit
7CA8 AND (HL) Merge the existing event flags, keeping the event bit reset
7CA9 JR $7C9C Reset the appropriate bit at 7F80 or 7F81
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