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IBM Journal of Research and Development  
Volume 25, Number 5, Page 483 (1981)
25th Anniversary Issue
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The Origin of the VM/370 Time-Sharing System

by R. J. Creasy
VM/370 is an operating system which provides its multiple users with seemingly separate and independent IBM System/370 computing systems. These virtual machines are simulated using IBM System/370 hardware and have its same architecture. In addition, VM/370 provides a single-user interactive system for personal computing and a computer network system for information interchange among interconnected machines. VM/370 evolved from an experimental operating system designed and built over fifteen years ago. This paper reviews the historical environment, design influences, and goals which shaped the original system.
Related Subjects: Memory (computer) management; Operating systems; Programming systems; Virtual machines