Oldest operational computer
cc at informatik.uni-stuttgart.de
Fri Feb 15 10:07:58 CST 2008
On Fri, 15 Feb 2008, William Donzelli wrote:
>> Wrong, "computer tubes" were developped for computers and
>> electronic calculating machines.
> All you need to do is look at the registration dates of the type
> numbers. And OSRD reports from World War 2.
Well, the types that I have listed are Noval/Miniature types and date from
the fifties (the E180CC for example is the same as a 7062). These types
were specifically made for computers and haven't existed during WW2 (where
the development of Rimlock types had started at the end, but not Noval).
According to your logic one has to call the E180CC an HiFi audio tube
because everyone's using them as such nowadays. I think we have to
differentiate between "computer tubes" as "tubes that were used in
computers but not specifically made for computers" and "computer tubes" as
"tubes specifically made for computers/digital applications". I am talking
of the latter.
Another example: The Zuse Z22 uses PL36 (or PL81?) for IIRC core memory
drivers. This tube is actually a TV horizontal output tube and although
extensively used in a computer, was definitely not a "computer tube". But
the Z22 also uses logic modules with E92CC (7 pin dual triode, Green
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