DEMOS

DEMOS is a Unix-like operating system developed in the Soviet Union. It is derived from Berkeley Software Distribution Unix.

Development

DEMOS's development was initiated in the Kurchatov Institute of Atomic Energy in Moscow in 1982, and development continued in cooperation from other institutes, and commercialized by DEMOS Co-operative which employed most key contributors to DEMOS and to its earlier alternative, MNOS. MNOS and DEMOS version 1.x were gradually merged from 1986 until 1990, leaving the joint OS, DEMOS version 2.x, with support for different Cyrillic script character encoding .
Initially it was developed for SM-4 and SM-1600. Later it was ported to Elektronika-1082, BESM, ES EVM, clones of VAX-11, and several other platforms, including PC/XT, Elektronika-85, and several Motorola 68020-based microcomputers.
The development of DEMOS effectively ceased in 1991, when the second project of the DEMOS team, RELCOM, took priority.