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The Elektronika MK-61 (Russian: Электро́ника МК-61) is a third-generation non-BASIC, RPN programmable calculator which was manufactured in the Soviet Union during the years 1983 to 1994. Its original selling price was 85 rubles.
The functionality of the MK-61 is identical to that of the MK-52, except the MK-52 has an internal non-volatile EEPROM memory module, for permanent data storage and also has the capability of using external EEPROM modules. The MK-61 is functionally very similar to the MK-54, the B3-34 and B3-21 Elektronika calculators, all of which are renowned for having a very large number of undocumented functions.
The MK-61 has 105 steps of volatile program memory and 15 memory registers. It functions using either three AA-size battery cells or a wall plug. It has a ten-digit (eight digit mantissa, two digit exponent) green vacuum fluorescent display.
- 1970s-1980s pocket calculators database
- Alfred Klomp's page on "Hacking the MK-61"
- How to calculate on the Elektronika B3-34 (and similar calculators)
- Elektronika MK-61 Operating Instructions, English translation
- 250 games for MK-52, MK-61
- MK-Compiler easy programming on the MK-61 and MK-52.
- Online-emulator of МК-61 (accurate emulation of the calculator's firmware, with automatic input code and output the contents of registers and stack).
- Emulator of МК-61 for Android (accurate emulation of the calculator's firmware, with ability to save states).
- Here you can download an emulator of all Soviet Programmable Calculators
- the page with a description of the emulator