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P > PRAVETZ > IMKO-1/2 & Pravetz 82   

IMKO-1/2 & Pravetz 82

In 1979, the Bulgarian Techical Cybernetics Institute took up with the idea of creating a small microprocessor based system.

In 1980 the first three Bulgarian microcomputers were produced. Their creators called the machine IMKO-1 for Individualen Micro KOmputer. In 1981 a series of few tenths machines was released. First users were enthusiastic about the versality and ease of use of the IMKO. Furthermore, the price wasn't very high.
Mass production started in 1982. First models shipped with a standard TV set instead of a monitor.

The IMKO-1 was actually an almost 100% compatible Apple II system featuring same expansion slots. Sadly, neither expansion card nor floppy disk unit were available in Bulgaria. Some rare customers bought them from Western European countries or from Taiwan, others used a tape recorder.

The first international presentation of the IMKO-1 occured at Robotics Symposium in England. Bulgaria demonstrated then a robot controlled by a microcomputer. At this time, Japaneses and U.S. robots were controlled by minicomputers. The IMKO-1 robot system cost thus ten times cheaper and its maintenance was much more easy.


Bozhidar Stefanov from Bulgaria adds:
Imko-1 and Imko-2 (almost the same machine with little upgrades) have been first manufactured in Sofia until 1982. The name was changed to Pravetz 82 when the computer was made in Pravetz, a small town near Sofia. It had a lot of peripherals like daisy whell printer, plotters or modems as well as loads of strange expansion boards specially manufactured for various factories. The Robot was called Robko 1 (an arm type robot)

Ivaylo Uzunoff reports :
Usually there was a monitor the same color as the computer box sitting on top of the main unit. The monitor had a black background, the symbols displayed on the monitor were green. usually on the right hand side there were two floppy drives one on top of another. They were connected with a wide "ribbon" cable to the main computer. To load OS you need to insert the disk into the flopy, since the computer did not had a HDD. Then you can insert a disk with primitive software or game.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).

Special thanks to Bozhidar Stefanov from Bulgaria who donated us this computer !



Saturday 9th November 2019
peter thomas (United States)


Saturday 9th November 2019
peter thomas (United States)


Saturday 9th November 2019
peter thomas (United States)


NAME  IMKO-1/2 & Pravetz 82
TYPE  Home Computer
ORIGIN  Bulgaria
YEAR  1979
BUILT IN LANGUAGE  Floating point BASIC interpreter. Several ROM expansion boards were available with Cobol, Fortran, Pascal, Logo, Ada languages
KEYBOARD  Full stroke 56 keys
CPU  6502
RAM  48 KB expandable to 64 KB
ROM  12 KB
TEXT MODES  40 chars. x 24 lines
GRAPHIC MODES  280x192 dots x 6 colours (or 280 x 160 + 4 text lines) in HiRes
40 x 40 squares (+4 text lines) or 40 x 48 in 16-colour mode.
SOUND  built-in speaker
SIZE / WEIGHT  39 (W) x 45 (D) x 12 (H) cm
I/O PORTS  floppy drive, tape recorder, 8 expansion slots
OS  Apple OS
POWER SUPPLY  Built-in power supply unit
PERIPHERALS  All Apple II extensions
PRICE  4190 Levs - About $2600

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