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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  • LocalOaf [they/them, ze/hir]@hexbear.net
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    7 days ago

    Gonna order the hat I’ve had on my wishlist for awhile today lady-doge

    Might put together that gift for the friend I ghosted and write a nice letter and send that

    Want to try going for a walk, I was trying to at least get a couple miles in each day but I’ve been kinda sick and haven’t gone the last couple days

    Should tidy up my bedroom but idk if I feel up to it, it’s always really mentally draining for me and I’m still kinda under the weather

    • LocalOaf [they/them, ze/hir]@hexbear.net
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      6 days ago

      Update: ordering the hat was a huge ordeal for one purchase but I did it because I’m stubborn and wanted it bad enough

      Fuck the internet and everything needing like 3 layers of codes and confirmation and backup accounts

      I jumped through like two hours of bullshit hoops for one goddamn item

      screm