Introduction
This is a V.23 modem, allowing to use a TO9 as a Minitel server. It is built-in on the French TO9+ (the export version has an RS232 port instead).
Registers
| Address | Name | Description |
|---|---|---|
| E7F8 | PORTA | Port A data/direction |
| E7F9 | COMMA | Port A control |
| E7FA | PORTB | Port B data/direction |
| E7FB | COMMB | Port B control |
| E7FE | ACIAS | Control / Status |
| E7FF | ACIAD | Data read/write |
