Routines
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FCDB: increment read/write pointer
Used by the routines at F5ED, FA60 and FBCD.
FCDB E6 AC INC $AC increment buffer address low byte
FCDD D0 02 BNE $FCE1 branch if no overflow
FCDF E6 AD INC $AD increment buffer address low byte
FCE1 60 RTS
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