Hans Franke asked questions about this early machine 3 years ago. (Okay!!! I'm a little behind. Been going through the archives to catch up.) Hans, if you are still interested, I can help you. I knew the designer, have a lot of his other projects, such as a casette interface for the EBKA. And if I can find it in the garage, I have a virgin PCB, the color layout, the memory extension, the 1702 programmer and so on. Was a very interesting project. I had mine running before I had a KIM, though I'm not certain who was first. It was close. Roger also designed the PAIA 8700, another sadly neglected early 650X project. Billy