BK (which stood for "home computer" in Russian) was a family of 16-bit home and school computers. More than 162,000 were built, about 78,000 of them for retail sale, i.e. for a wide range of buyers. The BK 0010-01 series sold for less than a color television (about 650 rubles), but still 2-3 times more than the wage of an engineer. The BK was the first computer to feature a Soviet-made operating system, DEMOS, which is jokingly referred to as UNAS (in Russian "ours"), parodying the well-known system UNIX (which if pronounced incorrectly can sound like "theirs").

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