Elektronika B3-21
Elektronika B3-21 (Cyrillic: Электроника Б3-21) was the first Soviet programmable calculator. It was released in 1977 and was sold initially for 350 rubles (190 in 1980-81, and just 80 rubles at late 1981). For comparison, 120 rubles was a monthly engineer's salary.{{citation needed, date=November 2015 Production was stopped in 1982 because of introduction of more advanced Elektronika B3-34. Features * program memory - 60 steps in RAM (no ROM, the code is lost after shut down); * data memory - 2 operating registers, 7 additional directly addressed registers, 6 loop stack registers; * accuracy - 8 digits in the Significand(7 if the value includes decimal dot), 2 exponent digits; * operations - besides 4 arithmetic ones there were 1/x, x2, xy, sqrt(x), exp(x), ln(x), sin(x), cos(x); * conditional and unconditional branching, subroutine calls; * speed - 3-5 operations (program steps) per second on average (with xy taking the longest time of about 3 seconds); * display ...
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