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Introduction
The 6850 is a serial port controller. It is used on Thomson TO machines to connect the keyboard to other parts of the system, allowing a detachable keyboard on the TO9 and TO9+.
On the TO9, the joystick/mouse connector is on the detachable keyboard, so it is scanned through the same serial protocol.
Registers
| Address | Name | Description |
|---|---|---|
| E7DE | SCR/SSDR | Control (write)/Status (read) |
| E7DF | STDR/SRDR | Data transmit/receive |
