RSX-11
Operating system
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RSX-11 is a discontinued family of multi-user real-time operating systems for PDP-11 computers created by Digital Equipment Corporation. In widespread use through the late 1970s and early 1980s, RSX-11 was influential in the development of later... Wikipedia
Default user interface: DCL and MCR Command-line interface
Developer: Digital Equipment Corporation
Source model: Closed source; kernel source code included