DEMOS

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DEMOS
Company/
developer
Kurchatov Institute of Atomic Energy, DEMOS Co-operative
OS family BSD Unix
Source model  ?
Latest stable release  ? / 1991
Available language(s)  ?
Supported platforms SM-4, Elektronika-1082, Elektronika-85, BESM, ES EVM, VAX-11, PC/XT, Motorola 68020
Kernel type  ?
Default user interface Command line interface
License  ?
Working state Historical

DEMOS (meaning "Dialogovaya Edinaya Mobilnaya Operatsionnaya Sistema" (Диалоговая Единая Мобильная Операционная Система, ДЕМОС), or "Interactive Common Portable Operating System") was a Unix-like operating system developed in the Soviet Union. It was derived from BSD Unix.

Its 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 (a clone of Unix Version 6). 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 charsets (KOI-8 and U-code, used in DEMOS 1 and MNOS, respectively).

Initially it was developed for SM-4 (a PDP-11/40 clone). Later it was ported to Elektronika-1082, BESM, ES EVM, clones of VAX-11, and a number of other platforms, including PC/XT, Elektronika-85 (a clone of DEC Professional), and a number of Motorola 68020-based microcomputers.

The development of DEMOS effectively ceased in 1991, when the second project of the DEMOS team, RELCOM, took priority.

The originally suggested name was УНАС (UNAS), which was a volapukish word play on Unix; "у них" ("u nih") in Russian means "at theirs", "у нас" ("u nas") means "at ours", but a more serious management dismissed this idea in favor of a traditional "alphabet soup".

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