====== 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      |