"Christian A. Weagle" wrote: > I have this old piece of Tektronix gear that plugs into their analog > 7000-series scope mainframes, called a 7D20. It is a 3-slot wide plugin > that is basically a digital scope that uses the mainframe for power and > display. It is two channel, each 70MS/sec, which is plenty fast for > much of what I need. And it also has this GPIB port on the front... I sympathize with you, because I also have a 7D20 that I like very much. Unfortunately, mine has a bad custom Tektronix analog IC in the front end, so it only has one working channel at the moment. If you come across a source of parts, let me know. I've already gone through all of the Web resources I could find, and I'm going to be scouring the flea markets and hamfests this summer. As far as GPIB, all I can tell you is that there was a proposal to Circuit Cellar last year for an article for a "low-cost RS-232 to GPIB converter". I suggested that with the disappearance of RS-232 ports on modern PCs, it might be a good idea to throw in an FT232/FT245 and turn it into a direct USB-to-GPIB converter. Unfortunately, we never heard back from the author. -- Dave Tweed -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist