Plessey System 250

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]

History

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.

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

Object-capability security

Concepts	Principle of least authority (POLA) Confused deputy problem Ambient authority File descriptor C-list Object-capability model Capability-based security Capability-based addressing Zooko's triangle Petnames

OS kernels	Hydra NLTSS KeyKOS EROS CapROS Coyotos Midori Fuchsia

Programming languages	Joule E Joe-E Cajita BitC

Filesystems	Tahoe-LAFS

Specialised hardware	Plessey System 250 Cambridge CAP IBM System/38 Intel iAPX 432

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