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Developer | IBM Cambridge Scientific Center (CSC) |
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OS family | CP/CMS |
Working state | Historic |
Initial release | January 1967 |
Marketing target | IBM mainframe computers |
Available in | English |
Platforms | A unique, specially modified IBM System/360 Model 40 |
Default user interface | Command-line interface |
License | Proprietary |
Succeeded by | CP-67 |
History of IBM mainframe operating systems |
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CP-40 was a research precursor to CP-67, which in turn was part of IBM's then-revolutionary CP[-67]/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,[1] 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.