$FCD1/64721:   Check Read / Write Pointer

Jump from $F624, $FACE, $FB7B, $FC30:

FCD1: 38        SEC
FCD2: A5 AC     LDA $AC       ; Pointer: Tape Buffer/Screen scrolling
FCD4: E5 AE     SBC $AE       ; Tape End Address/End of Program
FCD6: A5 AD     LDA $AD       ; Pointer: Tape Buffer/Screen scrolling
FCD8: E5 AF     SBC $AF       ; Tape End Address/End of Program
FCDA: 60        RTS

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