Schematics of Atanasoff-Berry Computer logic circuits?

Chuck Guzis cclist at
Fri Aug 22 00:15:56 CDT 2008

On 21 Aug 2008 at 23:48, William Donzelli wrote:

> Yes, and they sucked anyway.

1N21s could be pretty touchy mechanically and not at all uniform.  As 
a "microwave diode", I don't think they would have even been 
considered for digital logic.

They weren't the first packaged solid-state diode.  Copper-oxide 
rectifiers were around since the 1920's, but have lousy reverse-
voltage ratings (are they still used in the Simpson 260 VOM?).  
Selenium rectifiers were around a short time before the war, but not 
popular till afterward (I can still recall the smell of a failing 


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