Rodon MK-01

Date of appearance: 1991
Made in: Ukraine
Dimensions: 73 × 8.8 × 130 mm
Weight: (without batteries) up to 100 g
Tags: museumofsovietcalculators

The MK-71, a ten-digit solar-powered microcalculator, was produced from 1986 at Zelenograd’s Angstrem and Ukraine’s Rodon. Retailing at RUB 75, it quickly won cult status among users, particularly university students. It was a carbon copy of Casio’s FX-950, with the same key positioning and other elements. This is a scientific calculator that builds upon Elektronika MK-51 by incorporating more functions, giving it a grand total of 47 automatic operations. It has several modes: basic, calculations with a constant, combined function, and statistical calculations. The device uses algebraic logic and supports five-level operation ordering (brackets, parentheses, etc.). However, there was one fatal flaw — the low-quality keyboard. After six months of active use, the contacts became dislodged and either failed to register inputs or registered several of the same symbols at one time. This was a source of considerable frustration for users. In his article for issue 2 of the Radio magazine (1997), D. Tsybin came to the rescue with a fix for the problem. In 1987, Sverdlovsk Film Studios ran a commercial for Elektronika calculators, including the MK-71. There was also a modification of the MK-71 — the Rodon MK-01, which had all the same functions and came packaged with a slide-on cover. Ukraine’s Rodon factory was given exclusive rights to produce this model from 1993.

Rodon MK-01