This article covers the History of CP/CMS — the historical context in which this important IBM time-sharing virtual machine operating system was built. It provides details to support the main CP/CMS and History of IBM articles, drawing on source material that is not readily available on-line.
CP/CMS development occurred in a complex political and technical milieu. To understand the system's history, it is necessary to examine these broader forces. The following material summarizes major issues and events of the day from the perspective of CP/CMS development – a perspective that is somewhat different from (and orthogonal to) other ways of viewing the period. A key theme is the politics of a long running feud at IBM, between time-sharing and batch processing exponents.
Historical notes, below, provides supporting quotes and citations from first-hand observers.
Further information: CP/CMS, IBM mainframe operating systems, and History of IBMRead more about History Of CP/CMS: Early 60s: CTSS, Early Time-sharing, and Project MAC, IBM and The System/360, 1964–67: CP-40, S/360-67, and TSS, 1967–68: CP-67, 1968–72: CP/CMS Releases, 1968–86?: VP/CSS, 1964?–72?: IDC's Use of CP/CMS, Historical Notes
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