Phil Matthews wrote: Appearances can be misleading. I mostly wonder why it is that I remember how to take apart a 262X terminal better than I remember what I was working on last month. And, my work with this stuff was in a data processing and office automation environment, so what I remember is mostly terminals and HP150s and some early Vectras and of course classic HP3000s. There are other folks who read cctalk who have more clues than I do about the test-equipment side of HP, so posting to cctalk may get you more help than I can give you. One thing I am sure of, your first step is to take another look at your system. The 9133 is a disc drive; actually it is two of them, hard and flexible. It does have a microcontroller, but its firmware is about being disc drives, not about computing. Something else in there is the computer, and you need to look again and find out what that is. -Frank McConnell