DEMOS (Dialogovaya Edinaya Mobilnaya Operatsionnaya Sistema: Russian: Диалоговая Единая Мобильная Операционная Система, ДЕМОС, lit. 'Interactive Unified Portable Operating System') is a Unix-like operating system developed in the Soviet Union. It is derived from Berkeley Software Distribution (BSD) Unix.

It'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 (a clone of Version 6 Unix). 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 (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) and SM-1600. Later it was ported to Elektronika-1082, BESM, ES EVM, clones of VAX-11 (SM-1700), and several other platforms, including PC/XT, Elektronika-85 (a clone of DEC Professional), 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.

An archive of the DEMOS source code can found here: https://github.com/bpr97050/DEMOS There's some interesting comments and mailing list archives in that repository as well. :)

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  • Yukiko [she/her]
    ·
    12 hours ago

    I come in here with a question. Who is TC69? I've been here since the start and remember absolutely nothing about her. No disrespect, I just simply don't remember.

    • Thallo [love/loves]
      ·
      11 hours ago

      TransComrade69.

      Back in the early days, she was outspoken and aggressive in her defense of the trans community here. She helped identify and ban a lot of outwardly and passively transphobic people (who would, say, downvote trans posters exclusively--which is why we don't have downvotes anymore, I believe). She also bullied people into reading Feinberg.

      She's apparently back.

      • Yukiko [she/her]
        ·
        9 hours ago

        Geez, you can tell I've forgotten a bit of the early lore here. Makes sense considering it was an extremely turbulent time of my life. Thanks for the explanation. You'd think I wouldn't've forgotten someone like that.