Elektronika B3-21

Features

• program memory - 60 steps in RAM ;
• data memory - 2 operating registers, 7 additional directly addressed registers, 6 loop stack registers;
• accuracy - 8 digits in the Significand, 2 exponent digits;
• operations - besides 4 arithmetic ones there were 1/x, x², x^y, sqrt, exp, ln, sin, cos;
• conditional and unconditional branching, subroutine calls;
• speed - 3-5 operations per second on average ;
• display - red LED seven-segment display, with small lenses in front of each digit
• powered by disc accumulators or charger.

  Derived models

• Elektronika MK-46 - desktop version, differed in having 66 steps of program memory, digital inputs for connecting external devices, and output, e.g. for printer ;
• Elektronika MK-64 - the same as MK-46 but with internal analog-to-digital conversion installed so that several analog inputs could be measured ;
• Elektronika MK-47 - rare handheld clone of B3-21, allowing the storage of programs on magnetic memory cards.