RSTS/E
| RSTS/E 10.1, running the DCL CLI | |
| Developer | Digital Equipment Corporation, later Mentec | 
|---|---|
| Written in | MACRO-11 assembly language, BASIC-PLUS-2, DCL | 
| Working state | No development, still available | 
| Source model | Closed source | 
| Initial release | 1970 | 
| Latest release | RSTS V10.1 / 1992 | 
| Available in | English | 
| Update method | Binary patches, complete binaries | 
| Package manager | BACKUP | 
| Platforms | PDP-11 | 
| Kernel type | Time-sharing operating systems | 
| Default user interface | Command-line interface: DCL (Digital Command Language) | 
| License | Proprietary | 
| Preceded by | TSS/8 | 
RSTS (/ˈrɪstɪs/) is a multi-user time-sharing operating system developed by Digital Equipment Corporation (DEC, now part of Hewlett-Packard) for the PDP-11 series of 16-bit minicomputers. The first version of RSTS (RSTS-11, Version 1) was implemented in 1970 by DEC software engineers that developed the TSS-8 time-sharing operating system for the PDP-8. The last version of RSTS (RSTS/E, Version 10.1) was released in September 1992. RSTS-11 and RSTS/E are usually referred to just as "RSTS" and this article will generally use the shorter form. RSTS-11 supports the BASIC programming language, an extended version called BASIC-PLUS, developed under contract by Evans Griffiths & Hart of Boston. Starting with RSTS/E version 5B, DEC added support for additional programming languages by emulating the execution environment of the RT-11 and RSX-11 operating systems.