Hi I have a Cat. There are some companies that still use these as editing machines. That is why they seem to be missing from the collector group in general. I got mine but it otherwise works OK. I'd love to get some information on the memory and I/O mapping. It expects to use particular printers so it would be nice to rewrite the driver to work well with my 3SI. I could imagine that if I were doing a lot of writing for college or writing a book, I'd find the editor a real advantage. It has one other nice feature. One can write out a formula and it will give you the answer. It is kind of like having a spread sheet in your text. Of course, if you know the secret key sequence, you can bring it into the Forth mode. From here, you can access the inner machine as well. You can write Forth code and execute it in the text as well. It then becomes a spread sheet plus at that point. Still, it is primarily a text machine in black and white. I talked with Jeff about two years ago. He definitely had interesting ideas about computer interfaces. He didn't think much of the mouse. Besides being the major source of carpal tunnel syndrome (sp?) it is a real time waster for most applications. The machines code wasn't completely written in Forth but Jeff does attribute the quick software development and the fact that there were no errors found in the released version to using Forth in the creation of code. Forth tends to make a person do incremental testing as the code is written. This often helps to produce error free code in the final product. Dwight