Schematics of Atanasoff-Berry Computer logic circuits?

Brian L. Stuart blstuart at
Fri Aug 29 13:52:38 CDT 2008

> > (No doubt. I haven't seen a lot of the ENIAC electronic design but it 
> certainly
> >  > was unusual with the stacked tubes and multiple B+ levels.
> >
> > I can't help but see Eckert as one of the truly brilliant
> >  engineers of the 20th century.
> Well, yes, but having stacked tubes as pulse counters was pretty well
> known radar technology during the war.

Definitely.  In fact, as I understand it, Eckert had quite
a bit of experience with high speed counters in the radar
world.  That's what made the decade counters such a natural
design for him, as opposed to a binary approach that would
have saved tubes.

Where I think he really shown on the ENIAC however, was in
getting the level of reliability he did out of the components
of the day.  My understanding is that it was one of the
earliest applications of worst-worst design and of derating
the tubes, running them at lower filament and plate voltages
than normal, to extend their lives.


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