Commercial Operating System
| Developer | Digital Equipment Corporation | 
|---|---|
| Initial release | 1972 | 
| Available in | English | 
| Platforms | PDP-8, PDP-11, DECmate II | 
| License | Proprietary | 
| Preceded by | MS/8 | 
Commercial Operating System (COS) is a discontinued family of operating systems from Digital Equipment Corporation.
They supported the use of DIBOL, a programming language combining features of BASIC, FORTRAN and COBOL. COS also supported IBM RPG (Report Program Generator).