$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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