Changes
|Address (default) || Address (alternate) || Usage
|-
|F9E0h || F9E2h || Schneiderware V/24 [[8251 USART chip]] Data
|-
|F9E1h || F9E3h || Schneiderware V/24 [[8251 USART chip]] Control
|-
|F9ECh || F9E8h || Schneiderware V/24 [[8253 chip]] Timer 0 (TX clock)
|-
|F9EDh || F9E9h || Schneiderware V/24 [[8253 chip]] Timer 1 (RX clock)
|-
|F9EEh || F9EAh || Schneiderware V/24 [[8253 chip]] Timer 2 (unused)
|-
|F9EFh || F9EBh || Schneiderware V/24 [[8253 chip]] Timer Control<br>Note: Timer clock input is jumper select-able: 2MHz (default), or 1MHz
|-
|}
