High Quality Content by WIKIPEDIA articles! 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. 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).

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