IMKO-1

Start of production: 1980.
End of production: 1981.
CPU: MOS 6502, 1 MHz.
Memory (RAM): 48 KB (with the possibility to extend to 64 KB).
Memory (ROM): 12 KB.
Disk drive: No disk drives available, only a cassette player port.
Operating system: None.
Screen resolution: Text mode 40×24 (columns/rows), graphics mode 280×192 pixels - 6 colours, 280×160 pixels + 4 text rows, 40×40 pixels + 4 text rows, 40×48 pixels in 16 colours.
Variations: None.
Notes: Manufactured as an experimental model at the Institute for Cybernetics and Robotics at the Bulgarian Academy of Science. It was well accepted due to its low price for its time as well as due to its universal features and ease of use. It was first presented to the foreign audience in 1981 at the symposium on robotics in England as part of the demonstration of a robot arm (ROBKO-01).
At that time the robots in Japan and the USA were controlled by minicomputers, not microcomputers like IMKO-1 and this demonstration was a real success as the whole system cost tens of times less than the Japanese or American analogues. As all computers of the Pravetz series this model has hardware Cyrillic support, but because the keyboard was using 7 bits for transmitting the character codes the Cyrillic letters were overlapping the lower case Latin letters and it was only possible to type with upper-case Latin or Cyrillic letters.
Ports/slots: Cassette player port, 8 expansion slots. The zero slot was used for attaching extra memory up to the 64KB limit.
Manufacturer: ITCR - Sofia.
Price: N/A (never sold).

• http://www.homecomputer.de/pages/easteurope_bu.html
• http://www.pravetz.info/imko-1.html (in Bulgarian)
• https://www.amuseum.bg/publikacii/istoriya-na-kompyutri-pravec (in Bulgarian)