Plessey System 250

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The Plessey System 250 was the first operational computer system to implement capability-based addressing, and the first sold commercially. It was designed as a real-time controller for computerized telephone switching systems. It had a multiprocessing architecture.[1]


Manufactured by Plessey company plc in the United Kingdom in 1970, it was successfully deployed by the Ministry of Defence for the British Army Ptarmigan project[2] and served in the first Gulf War as a tactical mobile communication network switch.

See also[edit]


  1. ^ Henry M. Levy, The Plessey System 250, chapter 4 of Capability-Based Computer Systems, by University of Washington, USA
  2. ^ "Ptarmigan project". British Army, Ministry of Defence, UK. Archived from the original on 28 July 2006.

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