View Full Version : vt 220 as vdu?

March 23rd, 2011, 01:37 AM
I have recently aquired a dec Rainbow b2 machine and lk 201 keyboard, unfortunately there is no monitor. I do have a working vt220 terminal and keyboard, is there a way to configure a cable for the vt 220 display, and so use it as the vdu for the Rainbow, to run and display normal programs ? thanks Harry

March 23rd, 2011, 04:14 AM
No, but you can make a very simple adapter that allows you to use a standard monochrome composite video monitor. The VR201 actually uses composite video, but since it's in that funny cable, it's not obvious.

You simply need a 15 pin DSUB connector, some wire, a phone jack, and an RCA jack:

Pin 12 to center pin of RCA jack
Pin 4 to outer ring of RCA jack

Pin 7 (or 8) to keyboard +12v
Pin 5 (or 6) to keyboard ground
Pin 14 - received data from keyboard
Pin 15 - transmitted data from keyboard

Attached is a drawing of the LK201 pinout.


March 23rd, 2011, 09:45 AM
Thanks for info, thats great. seems straightforward enough, I ,ll get on with things, and let you know if the rainbow is working ! ....... harry