They sold for about 600–650 rubles. This was expensive, but marginally affordable, so they became one of the most popular home computer models in the Soviet Union, despite the fact that they had numerous problems. Later, in the 1990s, their powerful CPU and straightforward, easy-to-program design made them popular as demo machines. "BK" ("БК") is a Russian abbreviation for – domestic (or home) computer. The machines were also used for a short time as cash registers, for example, in the GUM department store.