Elektronika MK-52

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The Elektronika MK-52 (Russian: Электро́ника МК-52) is an RPN-programmable calculator manufactured in the Soviet Union from 1983 to 1992 at the Quasar and Kvadr plants in Ukraine.^[1] It belongs to the third generation of Soviet programmable calculators. Its original selling price was 115 rubles.^[2]

The MK-52 is a backwards compatible improvement to the Elektronika MK-61, the main changes being the addition of an internal non-volatile EEPROM module for permanent data storage, a diagnostic slot, and a slot for separately sold ROM modules.^[3] The machine code and functionality of the MK-52 and MK-61 calculators were extensions of the earlier MK-54,^[2] B3-34, and B3-21 Elektronika calculators. The MK-52 is the only calculator known to have internal storage in the form of an EEPROM module. As with many Soviet calculators, the MK-52 has a number of undocumented functions.^[4]

In November 1988, the MK-52 went into space on the Soyuz TM-7 spacecraft, where it could have been used as a backup to the onboard computers.^[1]