Changes
/* I/O Ports */
|F8E1h || F8F1h || Schneiderware Centronics 8255 PPI Port B (unused)
|-
|F8E2h || F8F2h || Schneiderware Centronics 8255 PPI Port C (busy/strobe=)<br>(bit7=busy, bit6-1=unused, bit0=strobe; strobe is externally inverted)
|-
|F8E3h || F8F3h || Schneiderware Centronics 8255 PPI Control
