$DD95/56725:   Manipulate flags

DD95: 90 06     BCC $DD9D

Jump from $CA4F, $E01A, $E0A0, $E107, $E25F, $E446:

DD97: A6 82     LDX $82         ; channel number
DD99: 15 EC     ORA $EC,X       ; set flag
DD9B: D0 06     BNE $DDA3

Jump from $DD95, $CFAC, $DFD2, $E003, $E0ED, $E21B:

DD9D: A6 82     LDX $82         ; channel number
DD9F: 49 FF     EOR #$FF
DDA1: 35 EC     AND $EC,X       ; erase flag

Jump from $DD9B:

DDA3: 95 EC     STA $EC,X
DDA5: 60        RTS

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