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In page PDP-11:

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Some OEM models were also frequently used as embedded systems to control complex systems like traffic-light systems, medical systems, numerical controlled machining, or for network management. An example of such use of PDP–11s was the management of the packet switched network Datanet 1. In the 1980s, the UK's air traffic control radar processing was conducted on a PDP 11/34 system known as PRDS – Processed Radar Display System at RAF West Drayton.[citation needed] The software for the Therac-25 medical linear particle accelerator also ran on a 32K PDP 11/23.[1] In 2013, it was reported that PDP–11 programmers would be needed to control nuclear power plants through 2050.[2]