Prehistoric CAD system...

In the mid-1980's I lived in Lowell, MA and my then wife (and briefly, myself) worked for a circuit board design company. Their primary CAD system was a PDP-11 based system from a company called, I believe, Telesys. It was a very good system from my recollection; it used a dual-display concept which was very efficient and had extremely good performance. The actual design consoles looked a lot like arcade video game consoles. There was a small monochrome CRT on the lower panel which displayed menus which one used a light pen to navigate through, and which was also used for drawing. One saw the results in "realtime" on the larger colour screen, all very sharp. Does anyone here have any more info on these. I do recall this being a *very* good system, but I can't find mention in my web searches. Thanks, Dennis "Come all ye roving minstrels And together we will try To raise the spirit of the Earth And move the rolling Sky" .