Hello (again) from Gregg C Levine I agree. You will note I didn't say where the medium sized box would use those parts, just that they did. However, according to three authors, also AMD engineers at the time of their writings, wrote this book, "Bit-Slice Microprocessor Design", and the authors were, John Mich, and Jim Brick. The application notes, that they compiled into it, suggest that something along the lines of the LSI-11 could evolve from their work. And indeed a different pairing did just that. The book's name, and the author's names were, " The art of digital design : an introduction to top-down design / David Winkel, Franklin Prosser". In that book they, completely cloned a PDP-11 system, or something that could run such software, as we would run on the families of simulators, and emulators. So we are both right from a certain point of view. And you've got a better idea of what I am up to. ------------------- Gregg C Levine hansolofalcon(a)worldnet.att.net ------------------------------------------------------------ "The Force will be with you...Always." Obi-Wan Kenobi "Use the Force, Luke."  Obi-Wan Kenobi (This company dedicates this E-Mail to General Obi-Wan Kenobi ) (This company dedicates this E-Mail to Master Yoda ) [mailto:pups-bounces@minnie.tuhs.org] On PDP-11's bus and were controllers.