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DEMOS/MP: The development of a distributed operating system

Barton P. Miller, Michael Powell, David L. Presotto

Abstract

Abstract The DEMOS/MP operating system has moved from a supercomputer with a simple addressing structure to a network of microcomputers. This transformation was done without significant changes to the semantics of the original DEMOS, i.e. existing DEMOS programs should run on DEMOS/MP. The changes to DEMOS were simplified by the structure of its primitive objects and the functions over those objects. The structure of DEMOS links and processes were the major contributors to the simplicity. The changes made to produce DEMOS/MP involved the internal structure of link, modification to parts of the kernel, and limited changes to the various system processes.

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Key concepts: Computer science, Simple (philosophy), Simplicity, Transformation (genetics), Kernel (algebra), Data structure, Semantics (computer science), Operating system