There are at least two types of Simon documents available. I *think* the first articles were the Radio Electronics Magazine series, and that was followed by the reprint. The primary difference that I could see was the color diagrams in the Radio Electronics Magazine series as opposed to B&W on the reprints. When the discussion took place the last time on this listserver, ISTR that Doug Salot had the reprints but they were slightly different from what I have. While I have the scans of the reprint (and they are still around here ... someplace), it would be nice to have the color wiring diagrams (they are MUCH easier to see the specific wiring being described in the figure.) Also, ISTR that someone else on the list got a copy of the articles from the Charles Babbage Institute and there were still some copyright restrictions.