Matrix could be predecessor of Matlab. It was available via ftp a couple of years ago, and perhaps even now. I have it somewhere in my archives. If the text on the case indicates that Matrix has GUI and dataflow systems, then I'm not sure if that Matrix is the same: Matlab was just a matrix processing language at the start, if I remember correctly. Sutherland must be of R. Sutherland 1966 something which is mentioned in the comp.lang.visual FAQ. I will search the literature. If I remember correctly, E. Surherland built first interactive graphics editor at 1961-62 with 2D constrained object manipulation. Then (his brother?) R. Sutherland extended it to 3D at 1963. These ideas included the build of circuit diagrams. The E. Sutherland's paper at 1962 mentions that the drawn circuit can be used "as is" in simulation. So, I'm curious how these ideas had evolved prior to 1966. I recently picked up circuit simulation papers back from 1960-1970. If anyone of you want to know faster what is on them, please mail me and we check them together. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software