Vacuum tube logic thing

From: Rick Bensene <>
Date: Tue Feb 3 09:38:19 2004

While used in a number of early Japanese computer, the Parametron was
also used in a desktop electronic calculator:

Not a tremendous amount is known about this machine, but it definitely
used Parametron logic, and was produced in some volume. The company
that made it, Oi Electric, in Japan, is still in business, and has one
of the machines on display in their office. This calculator was
Oi Electric's only foray into the calculator marketplace.

Rick Bensene
The Old Calculator Web Museum
Received on Tue Feb 03 2004 - 09:38:19 GMT

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