To all, Some 20 years ago, I led the Computer History Museum's restoration of an IBM 1620 Model 1 computer.  Our team was successful in both bringing the machine back to life and collecting a massive amount of manuals, books, and software for the machine.  Most notable the John Maniotes collection.  I can safely say that CHM has the largest collection of IBM 1620 material in the world. We are still looking for IBM 1620 Model 1 manuals to add to collection.  Please let me know if you have anything that we might be missing. In the past 2 years, several people have been writing simulators for the IBM 1620 Model 2 that go well beyond SIMH's instruction-level simulator.  These simulators are based on the logic diagrams of the machine and implement unusual corner cases as well as documented functionality.  One of the simulators has a text-based front panel while another one has a full true-to-life graphical front panel.  It's not my place to formally announce either program, that's for the creators to do once they complete their implementations.  I've been consulting with the engineers and am reaching out to the broader community for help. What they need, and CHM would be very interested in adding to its IBM 1620 collection, is original software specifically for the IBM 1620 Model 2.  Of particular interest are the IBM 1620 Monitor II and IBM 1620-2 diagnostics, but any Model 2 software would be helpful to their efforts. Please let me know if you have and IBM 1620 Model 2 software or manuals. Thanks, Dave Babcock