DEMOS

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For other uses, see DEMOS (disambiguation).

**DEMOS**
Company/ developer:	Kurchatov Institute of Atomic Energy
OS family:	BSD Unix
Working state:	historical

DEMOS (meaning "Dialogovaya Edinaya Mobilnaya Operatsionnaya Sistema" (Диалоговая Единая Мобильная Операционная Система, ДЕМОС), or "Interactive Common Portable Operation 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.

Initially it was developed for SM-4 (a PDP-11/40 clone). Later it was ported to Elektronika-1082, BESM, and ES EVM.

The originally suggested name was УНАС (UNAS), which was a volapukish word play with "UNIX"; "у них" ("u nich") 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".