|Source model||Closed source|
|Platforms||SM EVM, ES EVM, Elbrus, PDP-11 clones|
Mobile Operating System (MOS; Russian: Моби́льная Операцио́нная Систе́ма (МОС)) is an operating system, a Soviet clone of Unix from the 1980s.
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, INMOS, etc.