Heinz Wolter wrote: I used to work on a 7/16 in high school. I have docs! Paper tape programs as well. I'd fire up my TTY and dupe you the tapes if you said you had a way to read them. Yes, absolutely correct. I wrote a few assembly language programs on that system. Little did I know at the time, but it IS an excellent architecture. I've worked on PDPs (in college), but I must say that I am more fond of the Interdata system mostly for nostalgic reasons. The American high schools in Germany in the mid to late 70s ALL had Interdata 7/16s. The Army had a contract C3 corp (now defunct). That was the first machine that I ever spent any serious time on. There was a nice follow up on exactly that on alt.folklore.computers about six months ago. I saved it on a different system than the one I am on now. I'll post it when I find it. Soon! The only two OS's that I was aware of were: BOS (Basic Operating System -nothing to do with BASIC language), and MUE (Multi User Executive). As the names imply, the former was a single user OS, the latter allowed multiple users. The system we had 10 or 12 TTYs (ASR-33) connected to it. MUE was loaded first and then the BASIC interpreter. We eventually got floppies for it, though I don't think they ever worked properly and the TTYs provided THE I/O and hardcopy as well as user inputs. The thing had a wonderful front panel IIRC. I remember toggling in instructions that way when I didn't want to wait to load BOS, the editor and the assembler. The system in Darmstadt had a 20 MB disk system (10 mb fixed w/10 mb removable). The disk system WAS nice! If you could get one of those generic 20 mb units (forget manufacturer -will look up), then your Unix possibility might become a reality. Good luck with it! I'll dig up what I can on it. Regards, Eric