It was a DOS program, written in C. Fritz asked me to write it for Windows 2.1, but I said: "no thanks, all I need is a frame buffer and a GPIB IO Card". I made my own simple little graphics subsystem with fonts borrowed from X11.
Here's a little picture gallery I have of the ICE lab from 1990: http://www.marinopoulos.net/gallery2/v/Cars/StanfordEngineLa...
Enjoy!