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Old 27th Mar 2021, 8:04 pm   #274
ortek_service
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Join Date: May 2018
Location: Northampton, Northamptonshire, UK.
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Default Re: I found it! A very sorry looking MK14.

It seems the programming of the Tesla ones is closer to the Texas Instrument versions. So maybe they were a clone of those (that do seem less common that NS ones), and they have similar power consumption.
It's a pity there never seems to have been an 'L' Low power version, like with some EPROM's etc, before (High-Speed) CMOS versions were available.

It seems there was quite a lot of cloning of Western technology in the Eastern-bloc - Often whole Sinclair computers, including their own ULA.
And apparently they had a series of logic IC's in DIL packages with a metric pitch! (Recently found RS sell 2.5mm pitch veroboard, after someone bought it by mistake, when there's very few metric-pitch leaded connectors etc.)
The only Russian etc. made semiconductors that seem to make it over here back then, were transistors in those 5" B&W Rigonda VL100M TV's, popular with Caravaners etc. as had a bolt on the back PSU plugged into TV's 12V DC input.
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