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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  • BountifulEggnog [she/her]@hexbear.net
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    5 days ago
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    I’ve written notes before. I always struggled, because I didn’t have the words to describe my suffering. It was unclear to me. Now, it is much clearer. I don’t have a desire to write anything lengthy though. It isn’t possible for them to understand anyway. When the time comes, I’ll probably just write something short. Leaving without saying anything seems wrong. Something short and simple seems fitting. I’ve never liked saying more then I need to.

    • kristina [she/her]@hexbear.netM
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      Eggy, just know we support you and if you really need assistance leaving your current situation please let me know, our mutual aid group is specifically for people that are in deep shit like this. Suicide isnt the way to go before trying other options, I was in your shoes before and I wouldn’t have been able to help so many people if I had given in to those thoughts. You can be happy! cat-trans