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Operating Systems

Pilot: An Operating System for a Personal Computer

David D. Redell, Yogen K. Dalal, Thomas R. Horsley, Hugh C. Lauer, William C. Lynch,
Paul R. McJones, Hal G. Murray, and Stephen C. Purcell

Xerox Business Systems

The Pilot operating system provides a single-user, single-language environment for higher level software on a powerful personal computer. Its features include virtual memory, a large "flat" file system, streams, network communication facilities, and concurrent programming support. Pilot thus provides rather more powerful facilities than are normally associated with personal computers. The exact facilities provided display interesting similarities to and differences from corresponding facilities provided in large multi-user systems. Pilot is implemented entirely in Mesa, a high-level system programming language. The modularization of the implementation displays some interesting aspects in terms of both the static structure and dynamic interactions of the various components.

Key Words and Phrases: personal computer, operating system, high-level language, virtual memory, file, process, network, modular programming, system structure

CR Categories: 4.32, 4.35, 4.42, 6.20

This is a digitized copy derived from an ACM copyrighted work. ACM did not prepare this copy and does not guarantee that is it an accurate copy of the author's original work. The original appeared in the February 1980 edition of Communications of the ACM (Volume 23, Number 2, pages 81-92).

Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the ACM copyright notice and the title of the publication and its date appear, and notice is given that copying is by permission of the Association for Computing Machinery. To copy otherwise, or to republish, requires a fee and/or specific permission.

A version of this paper was presented at the 7th ACM Symposium on Operating Systems Principles, Pacific Grove, Calif., Dec. 10-12, 1979

Authors' address: Xerox Business Systems, 3333 Coyote Hill Rd., Palo Alto, CA 94304.

© 1980 ACM 0001-0782/80/0200-0081 $00.75.

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