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| Developer | Digital Equipment Corporation |
|---|---|
| Written in | FOCAL, Fortran-IV, MACRO-11, TECO |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1970 |
| Latest release | V09-20C / June 1974 |
| Platforms | PDP-11 |
| Default user interface | Command-line interface |
| License | Proprietary |
BATCH-11/DOS-11, also known simply as DOS-11, is a discontinued operating system by Digital Equipment Corporation (DEC) of Maynard, Massachusetts. The first version of DOS-11 (V08-02) was released in 1970 and was the first operating system to run on the Digital PDP-11 minicomputer. DOS-11 was not known to be easy to use even in its day and became much less used in 1973 with the release of the RT-11 operating system.