Hi, I just read your note that you just got a NBZ80 Nanocomputer. Where did you get it and how can I get one? I will give you a really good hint about what you can do about documentation. I have two books that are based entirely upon that nanocomputer. Here are the titles of those books. Actually it is Book 1 and Book 2. Name: Z-80 Microprocessor Programming and Interfacing. Authors: Elizabeth A. NIchols, Joseph C. NIchols, and Peter R. Rony Go to www.abebooks.com This is a used bookstore and they have thousands and thousands of new, used and out of print books. I know that they have some listings of these books. I had Book 2, but just got Book 1 from them. good luck. If you know where I can get another nanocomputer, I would appreciate it. steve hatch