Schematics of Atanasoff-Berry Computer logic circuits?

Chuck> 1N21s could be pretty touchy mechanically and not at all Chuck> uniform. As a "microwave diode", I don't think they would Chuck> have even been considered for digital logic. Chuck> They weren't the first packaged solid-state diode. Chuck> Copper-oxide rectifiers were around since the 1920's, but have Chuck> lousy reverse- voltage ratings (are they still used in the Chuck> Simpson 260 VOM?). Selenium rectifiers were around a short Chuck> time before the war, but not popular till afterward (I can Chuck> still recall the smell of a failing one). Did Univac 1 use selenium diodes? I certainly remember them as rectifiers. My father had an article, or data sheet, describing a copper-oxide FET. The article was from well before WW2. I haven't seen it in decades, unfortunately. But that fits with a transistor timeline that showed up in this week's edition of one of the EE trade rags, which says that the FET was patented in 1925 "but never built". I wonder about the accuracy of that "never built". Or maybe vaporware was invented way back then, too? :-) paul