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| Developer | Cray Research |
|---|---|
| Written in | Assembly, C |
| OS family | Unix and Linux |
| Working state | Discontinued |
| Source model | Closed source and Open source |
| Initial release | 1984 |
| Marketing target | Supercomputers |
| Available in | English |
| Platforms | Monolithic kernel: Cray-1, 2, X-MP, X1, XT3, XT4, XT5 Microkernel: Y-MP, C90, T3D, T3E |
| Kernel type | Monolithic (some) Microkernel (some) |
| Default user interface | Command line interface |
| License | Proprietary |
| Preceded by | CX-OS Cray Operating System (COS) |
| Succeeded by | Cray Linux Environment |
| Official website | www |
UNICOS is a range of Unix and later Linux operating system (OS) variants developed by Cray for its supercomputers. UNICOS is the successor of the Cray Operating System (COS). It provides network clustering and source code compatibility layers for some other Unixes. UNICOS was originally introduced in 1985 with the Cray-2 system and later ported to other Cray models. The original UNICOS was based on UNIX System V Release 2, and had many Berkeley Software Distribution (BSD) features (e.g., computer networking and file system enhancements) added to it.