Electronika 60

The Electronika 60 (Электроника 60) is a computer made in the Soviet Union by Elektronika in Voronezh from 1978 until 1991. It is a rack-mounted system with no built-in display or storage devices. It was usually paired with a 15IE-00-013 terminal and I/O devices. The main logic unit is located on the M2 CPU board.

The original implementation of Tetris was written for the Electronika 60 by Alexey Pajitnov in 1985. As the Electronika 60 does not have raster graphics, text characters were used to form the blocks.

Technical specifications
M2 CPU:
 * LSI-11 (PDP-11 LSI CPU implementation) clone
 * Word length: 16 bits
 * Address space: 32K words (64 KB)
 * RAM size: 4K words (8 KB)
 * Number of instructions: 81
 * Performance: 250,000 operations per second
 * Floating-point capacity: 32 bits
 * Number of VLSI chips: 5
 * Board dimensions: 240 × 280 mm