Never forget that PDP-11 was not the only significant player in real-time systems. The SDS/Xerox Sigma series was a leader in real-time research and control as well as time sharing. Many of the best SDS software developers on CP-V, CP-R, XOS, and RBM ended up on the VMS team. Comshare Corporation made its living on the Sigma 9 for many years, and even resorted to manufacturing their own after Honeywell pulled the plug. Many Sigma 5 and Sigma 7 systems launched Gemini and Apollo missions, and Sigma 5 and Sigma 9 systems were the basis of CUBIC Air Combat Maneuvering Instrumentation systems that revolutionized Air Combat Training and put the visual zing in the movie "Top Gun".
I am one of the few who can still fix one if it breaks, and they are still out there. Call me.