Re: Interesting programming description for bank selection

From: Michał Pleban <>
Date: Wed, 23 Apr 2014 11:16:53 +0200
Message-ID: <>

Marko Mäkelä wrote:

> By the way: it has worked also the other way around. I have heard that
> the Soviet Union used Metric 2.5mm spacing on IC cases instead of 0.1"
> or 2.54mm, and that they used metric scale on aircraft altimeters while
> the globally established convention is feet. I would guess that this was
> deliberate, to oppose the "imperialistic" system. :)

I don't believe it to be true. I have seen lots of Soviet chips (like
8080 clones, 2732 compatible EPROMs etc.) and they fit standard sockets
perfectly. And with the 40 pin ones, you would have 0.8mm difference,
quite noticeable.

This difference in measurement systems had profound effects, however,
when Soviets tried to copy American technology, because the sizes of
screws and other standard parts were different and it was generally not
easy (nor feasible) to produce parts with imperial sizes. That
contributed to a general unreliability of Soviet systems (such as Tu-4
bomber which was nothing more than than a reverse-engineered Boeing B-29).


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Received on 2014-04-23 10:00:08

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