Concept

History of CP/CMS

Summary
This article covers the History of CP/CMS — the historical context in which the IBM time-sharing virtual machine operating system was built. CP/CMS development occurred in a complex political and technical milieu. Historical notes, below, provides supporting quotes and citations from first-hand observers. Early 60s: CTSS, early time-sharing, and Project MAC The seminal first-generation time-sharing system was CTSS, first demonstrated at MIT in 1961 and in production use from 1964 to 1974. It paved the way for Multics, CP/CMS, and all other time-sharing environments. Time-sharing concepts were first articulated in the late 50s, particularly as a way to meet the needs of scientific computing. At the time, computers were primarily used for batch processing — where jobs were submitted on punch cards, and run in sequence. Time-sharing let users interact directly with a computer, so that calculation and simulation results could be seen immediately. Scientific users quickly emb
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