RSX-11 is a family of real-time operating systems mainly for PDP-11 computers created by Digital Equipment Corporation (DEC), common in the late 1970s and early 1980s. RSX-11D first appeared on the PDP-11/40 in 1972. It was designed for and much used in process control, but was also popular for program development.
Dave Cutler was the project leader for RSX-11M, which was an adaptation of the earlier RSX-11D for a smaller memory footprint. Principles first tried in RSX-11M later appeared in DEC's VMS. Microsoft's Windows NT system is a conceptual descendant of RSX-11M but is more directly descended from an object-oriented operating system Cutler developed for a RISC processor (PRISM) which was never released. This lineage is made clear in Cutler's foreword to "Inside Windows NT" by Helen Custer.[
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