Re: Interesting programming description for bank selection

From: HÁRSFALVI Levente <>
Date: Wed, 23 Apr 2014 14:08:35 +0200
Message-ID: <>

On 2014-04-23 11:16, Michał Pleban wrote:
> Hello!
> 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.

Well, then they might have produced both. One of my friends has talked
me about a Soviet i8255 clone that he could in no way use, as the chip
just didn't fit the socket ;-). Back in the early '90s, when he started
building circuits, standard MSI components (and above) were still hard
to come by / expensive here, so young techies like him just cooked from
what they could obtain (thus the Soviet stuff). I've never met those
Soviet MSI clones myself (though, even I should have some K155***s
packed away somewhere at home |-))) ).

> 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).

Yeah, just similarly to the Li-2 (a slightly modified variant of the
DC-3, built under license), which had to be heavier than its original
counterpart, due to the use of thicker (metric) sheet aluminum that they


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Received on 2014-04-23 13:00:04

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