     $FDD3/64979:   Attempt counter for formatting

    Jump from $FB09, $FB59, $FB7A, $FBCB, $FC12, $FC2D, $FD5F:

    FDD3: CE 20 06  DEC $0620       ; decrement number of attempts
    FDD6: F0 03     BEQ $FDDB       ; zero, then error
    FDD8: 4C 9C F9  JMP $F99C       ; continue

    Jump from $FDD6:

    FDDB: A0 FF     LDY #$FF
    FDDD: 84 51     STY $51         ; flag for end of formatting
    FDDF: C8        INY
    FDE0: 84 50     STY $50
    FDE2: 4C 69 F9  JMP $F969       ; error termination

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