Changes
|#EFXX||%xxx0xxxx xxxxxxxx||Printer Port|| - ||Write
|-
|#F4XX||%xxxx0x00 xxxxxxxx||[[8255]] PIO Port A([[PSG]] Data)||Read||Write
|-
|#F5XX||%xxxx0x01 xxxxxxxx||[[8255]] PIO Port B(Vsync,PrnBusy,Tape,etc.)||Read|| -
|-
|#F6XX||%xxxx0x10 xxxxxxxx||[[8255]] PIO Port C(KeybRow,Tape,[[PSG]] Control|| - ||Write
|-
|#F7XX||%xxxx0x11 xxxxxxxx||[[8255]] PIO Control-Register|| - ||Write
