Changes
/* I/O Ports */
|#EFXX||%xxx0xxxx xxxxxxxx||[[Printer Port]]|| - ||Write
|-
|#F4XX||%xxxx0x00 xxxxxxxx||[[8255]] PIO PPI Port A ([[PSG]] Data)||Read||Write
|-
|#F5XX||%xxxx0x01 xxxxxxxx||[[8255]] PIO PPI Port B (Vsync,[[Printer Port|PrnBusy]],Tape,etc.)||Read|| -
|-
|#F6XX||%xxxx0x10 xxxxxxxx||[[8255]] PIO PPI Port C (KeybRow,Tape,[[PSG]] Control)|| - ||Write
|-
|#F7XX||%xxxx0x11 xxxxxxxx||[[8255]] PIO PPI Control-Register|| - ||Write
|-
|#F8FF||N/A||[[Peripheral Soft Reset]] (MC_BOOT_PROGRAM and MC_START_PROGRAM do OUT [F8FF],FF)|| - ||Write
