$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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