IBM CP-40

IBM CP-40

CP-40 was a research precursor to CP-67, which in turn was part of IBM's then-revolutionary CP/CMS – a virtual machine/virtual memory time-sharing operating system for the IBM System/360 Model 67, and the parent of IBM's VM family. CP-40 ran multiple instances of client operating systems – particularly CMS, the Cambridge Monitor System, built as part of the same effort. Like CP-67, CP-40 and the first version of CMS were developed by IBM's Cambridge Scientific Center (CSC) staff, working closely with MIT researchers at Project MAC and Lincoln Laboratory. CP-40/CMS production use began in January 1967. CP-40 ran on a unique, specially modified IBM System/360 Model 40.

See also:

• CP/CMS: The widely used successor to CP-40, and the precursor to IBM's VM systems
• Cambridge Scientific Center, where CP-40 and CP/CMS were built
• IBM M44/44X, a contemporary experimental paging system
• History of CP/CMS, a review of events and issues leading to the creation of CP-40