84PCE:Ports:B000 Unknowns

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Port    Default    Bits    Information   
B000 64 ?? Value seems fixed
B001 64 ?? Value seems fixed
B002 61 ?? Value seems fixed
B003 4C ?? Value seems fixed
B004 00 FF Ports B004-B007 latch value written
B008 Ports B008-B00B always read 0
B00C 00 77 Writing FF latches to 63, though you can manually write 67.
B00D 00 FF Ports B00D-B00F latch value written
B010 Ports B010-B013 always read 0
B014 00 FF Ports B014-B01B latch value written
B01C Ports B01C-B01F always read 0