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| | The State of the Art |
 | | Examples of commercially available descriptor-based systems are the IBM System/370 models that support virtual memory, the Univac (formerly RCA) System 7, the Honeywell 6180, the Control Data Corporation Star-100, the Burroughs B5700/6700, the Hitachi 8800, the Digital Equipment Corporation PDP- 11/45, and the Plessey System 250. |
 | | Also in 1969, the Multics system, a joint project of M.I.T. and Honeywell, implemented in software and hardware a complete descriptor-based access control list system with hierarchical control of authorization on a Honeywell 645 computer system [26], [77]. |
 | | In 1973, a hardware version of the idea of rings of protection together with automatic argument address validation was implemented for Multics in the Honeywell 6180 [63]. |
| www.cap-lore.com /CapTheory/ProtInf/State.html (2157 words) |
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