Changes
/* I/O Ports */
|Address (default) || Address (alternate) || Usage
|-
|F8E0h || F8F0h (later redefined to F8E4h) || Schneiderware Centronics [[8255 PPI chip|8255 PPI]] Port A (data)
|-
|F8E1h || F8F1h (later redefined to F8E5h) || Schneiderware Centronics [[8255 PPI chip|8255 PPI]] Port B (unused)
|-
|F8E2h || F8F2h (later redefined to F8E6h) || Schneiderware Centronics [[8255 PPI chip|8255 PPI]] Port C (busy/strobe)<br>(bit7=busy, bit6-1=unused, bit0=strobe; strobe is externally inverted)<br>(autolf is wired to GND, all other control/status signals are not connected)
|-
|F8E3h || F8F3h (later redefined to F8E7h) || Schneiderware Centronics [[8255 PPI chip|8255 PPI]] Control
|-
|}
