MOS (operating system)

Mobile Operating System (MOS; Моби́льная Операцио́нная Систе́ма (МОС)) is an operating system, a Soviet clone of Unix from the 1980s.

Overview
This operating system is commonly found on SM EVM minicomputers; it was also ported to ES EVM and Elbrus. MOS is also used by high-end PDP-11 clones.

Modifications of MOS include MNOS, DEMOS,, etc.