Elektronika MK-52

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.

The calculator is fully compatible with the second-generation models (B3-34 and MK-54), using the same command system and machine codes.

In addition, you can connect an external ROM which is a memory expansion unit with stored games and mathematical programs, produced by the manufacturer, that constitute the user library.

In 1988, 15,200 units of this ROM were manufactured, and were sold at a price of 16 rubles; BRP-4 (Russian: БРП-4) was produced in 1989, containing game programs; GRP "Geo".

Manual calculations in automatic mode are in accordance with Reverse Polish Notation logic.

To stop it: C/П or CX Calculator's rough speed can be measured by using a stopwatch, and terminating the program after a specific time elapsed.

When clearing, reading, or writing to the EEPROM memory, the address and range are specified by a six-digit number, preceded by a non-zero number, in automatic mode: e.g. 1aaaadd specifies that dd bytes are to be stored starting at memory address aaaa.

As typical for Soviet electronics, technical schematics were provided for the MK-52 when it was purchased, facilitating user modification and repair of the machine.

The word, written in this fashion, cut down on the number of display segments used to display the error message; however, this spelling, read as Cyrillic, would instead be pronounced "eggog" or "yeggog", depending on the language (the Cyrillic е is iotated in Russian and Belarusian - and, by extension, in the Russian-derived orthographies created for Non-slavic languages by the Soviet Union - but not in other Slavic languages such as Ukrainian, Bulgarian, or Serbian).

The MK-52's undocumented functions tend to be heavily used in the games due to their ability to make unusual calculations and produce specialized displays.

In November 1988, the MK-52 went into space on the Soyuz TM-7 spacecraft, where it could have been used to calculate the trajectory of landing in the event of an onboard computer failure.