     $FDC3/64963:   Read/write ($621/$622) times

    Jump from $FB0F, $FB17:

    FDC3: AE 21 06  LDX $0621
    FDC6: AC 22 06  LDY $0622

    Jump from $FDC9, $FDCD, $FDD0:

    FDC9: 50 FE     BVC $FDC9       ; byte ready?
    FDCB: B8        CLV
    FDCC: CA        DEX
    FDCD: D0 FA     BNE $FDC9
    FDCF: 88        DEY
    FDD0: 10 F7     BPL $FDC9
    FDD2: 60        RTS

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