$F8C0/63680:   Conversion table GCR to binary - low nybble

F8C0: FF FF FF FF FF FF FF FF
F8C8: FF 08 00 01 FF 0C 04 05
F8D0: FF FF 02 03 FF 0F 06 07
F8D8: FF 09 0A 0B FF 0D 0E FF

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