Elektronika MK-61/52 and 152/161: small tech review (En)


This short article speak about calculators Electronica MK-52 and MK-61 and new MK-152/161 models of programmable controllers which able also act as keystroke programming calculator. Since 2007, there were only two English articles about MK-152 (1, 2) with pictures but without some tests and technical information.

New models are compatible with old programmable calculators MK-61, MK-52. The popularity of these Soviet mass-market calculators based on strong support in media such as "Nauka i zhizn" ("Science and Life"),"Technika molodyozhi" ("Technique for youth") and many other. For example, in 1985 Soviet science fiction writer Mikhail Puhov (1944-1995) wrote a novel "Returning to the Earth" and illustrated with a set of simple programs, step-by-step space simulators for Soviet programmable calculators, that were written by author and checked by Soviet cosmonaut U. N. Glazkov (flight engineer of Salyut 5).

For non-Russian readers there are some useful links explaining how to work with MK-61 including translation of keyboard symbols. Many thanks to Gregory Escov's site.

  • The description of MK-61 keyboard. Here I describe all the keys on MK-61 keyboard (other keyboards are very much like this one), and what those keys do in combination with other keys. If you actually intend to try anything described in other articles, you should probably read this one, for it gives all the "ASCII" names for MK buttons.
  • Pseudo-writing mode. I already wrote one article about Soviet programmable calculators. This one tells about a strange mode you can get them in, "pseudo-writing mode".
  • A journey of big numbers (uncompleted). This article will tell you about the various "big numbers" that you can get on your MK54-compartible calculators - that is, the numbers that can not be displayed properly and, according to documentation, can not even exist. But, as you see, there's quite a lot of stuff you can do with bignums...

Tech Side

MK-152/161 is not a clone of those 20-year old calcs, but small programmable controllers used the same keystroke based entry language. They have about 100 times more memory and about 1000 times faster according to "8 queen" test. The small screen can display digits, Russian and English letters, a set of special characters and monochrome computer graphics. Keyboard is almost the same excluding a new prefix key "P", four directional keys and two menu keys (Enter and Escape).

Instruction set was expanded to deal with larger memory and to control I/O port(s). On-board programming service was partially improved: one can see not only instruction code (in hex), but also instruction mnemonics. Unfortunately, no mnemonic labels are provided for on-board programming and you may really need a computer with cross-compiler to write programs below the limit of 100-200 steps.

The entry language uses reverse-polish notation and resembles the language of HP-12/HP-15.

Manufacturer provides a cross-compiler for PC (Windows) that can help:

  • to write programs in English notation (you can use labels)
  • to compile them into hexadecimal bytecode
  • to transfer programs to and from device via RS-232

The table below compare devices with the last Soviet model, MK-52. See also MK-52 and MK-161 pages on RSkey.org.

  МК-52 (MK-52) МК-152 (MK-152) МК-161 (MK-161)
Number of decimal digits,
displayed (total)
8 (8) + 2 8 (14) + 2 8 (14) + 2
Number of basic commands 229 242 242
Instruction length 1 or 2 steps 1, 2 or 3 steps 1, 2 or 3 steps
Instruction mnemonics Russian Russian, English Russian, English
Address modes register,
Number and size of stack registers 4+1, 8+2 digits 4+1, 14+2 digits 4+1, 14+2 digits
Number and size of decimal registers 15, 8+2 digits 1000, 12+2 digits 1000, 12+2 digits
Number of byte registers No 7168 7168
Electronic notebook capacity No 65 Kb, 12+2 digits 65 Kb, 12+2 digits
Electronic disk capacity 512 steps 512 Kb 512 Kb
File system No Proprietary Proprietary
External disk support Read-only (ROM) Read/write Read/write
Maximum program length 105 steps 10000 steps 10000 steps
Procedure stack size 4 64 64
Display resolution 12 digits, green vacuum fluorescent display 128x64 dots, monochrome LCD 128x64 dots, monochrome LCD
Serial interface No RS-232C compatible RS-232C compatible, SPI
Parallel interface No Centronics, EPP, Static Static
Proprietary interface Yes, not documented Yes, documented Yes, documented
Other interfaces No No A/D
Paperback manual Included, Russian Included, Russian Included, Russian
Communication software No Downloadable for free, for Windows and wine Downloadable for free, for Windows and wine
Cross-compiler, decompiler and other developer tools No Downloadable for free with source code, for Windows and
Downloadable for free with source code, for Windows and
CPU model К745ИК13 chipset (original) W77LE516 (MCS-51 series) W77LE516 (MCS-51 series)
CPU frequency 455 KHz 22 MHz 22 MHz
Internal bus width, bits 1 bit (serial) 8 bit 8 bit
Development, city Government, Kiev Commercial, Novosibirsk Commercial, Novosibirsk
Years of production 1983-1991 2007-nowadays 2009-nowadays
Size 212 х 78 х 42 mm 250 x 180 x 75 mm 95 x 160 x 50 mm
Weight 250 g (w/o batteries) 900 g 350 g (with cell)
Batteries 4 x AA No Internal rechargeable cell
External power AC adapter 220V AC adapter 220V (built-in) AC charger 220V (external)
Price 115 Soviet rubles (about $190) See manufacturer prices See manufacturer prices
Модели и серии: 


Small correction "Number of decimal registers" was 15 for MK-52 (and MK-61, which I once had).
(14 was for BZ-34 (or B3-34? - I've never known that ^_^) and MK-54.)

Thank you, corrected.

Probably, it is necessary to add article with materials on МК-161?

Мои программируемые калькуляторы:
Б3-21, Б3-34, МК-61, МК-52, МК-85
CASIO: cfx-9850GB+, fx-9750G+, fx-9750GII, fx-9860G, Algebra fx-2.0, fx-5800P, fx-7400G+
HP: 50G, 48G, 35s
TI: Nspire-CAS, Voyage-200, 89Titanium

Yes. Noone can stop you from writing the article about MK-161. In fact, its a good idea.

Done with another small corrections.

Ни разу не слышал, чтобы МК-52 выпускался со светодиодным (LED) индикатором.