Tektronix VT220 compatible keyboard - information needed - test-drb@ccmp.vtda.org

25 Jul 2014

I have a Tektronix VT220 compatible keyboard as pictured here:

http://deskthority.net/resources/image/12676

Can anyone provide any information/links/technical specs? I suspect it 
is off either a character terminal or an X-terminal. If I can't find 
anything about the protocol the plan will be to replace the controller, 
an Intel p8049ah with an Arduino to do the row/column scanning.

The keyboard was made by NMB and contains Hi-Tek 'space invader' key 
switches.
The cable ends in a 6 pin mini-din connector.
The pins of the cable are labelled as follows:

1. Clock
2. Data
3. N.C.
4. IG GND
5. +5V
6. CHASSIS GND

I didn't think this would be PS/2 compatible, and it doesn't look like 
it as the signals don't tie up with a 6 pin MINI-DIN PS/2 pin out.

Thanks!

Mark.