Looking for schematics for DEC M702 and M720 modules

Hello Ethan, (M720 circuit diagram) And it's certainly better quality than what I got from the fiche reader screen. In case somebody else wants to try: I got readable quality with a few simple measures. In a dark room to avoid reflections, set the camera's shutter control to "dark night mode" and put the camera on a tripod. Since mine doesn't have a remote trigger capability, I used the timer function to avoid touching the camera, so it would be steady while taking the picture. For my setup, it didn't make a difference in the final picture whether I set the fiche reader to "high" or "low" light. Even though the picture gets darker towards the corners, in a 1,600 by 1,200 (2M pixel) .JPG you can read about everything that is readable on the screen. These are certainly harder to get than the 7400s, but it appears to me that the 7460 is actually used a a kind of delay line: since all inputs of each gate are tied together, there is no logic function involved, so maybe you can get away with something completely different. Since I had the fiche looked up already: the only difference between the original schematics and Rev. A is C7: it had ".005MFD" originally and was changed to ".02MFD" in Rev. A. Looks like the one-shot made from E3 needed a longer trigger pulse. You're welcome! - I also used the opportunity to test what the camera can do for me. Now that I have the procedure: If you need anything else, let me know. -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com