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| Developer | IBM |
|---|---|
| Written in | Assembly language, Basic Systems Language (BSL) |
| OS family | OS/360 and successors |
| Initial release | March 31, 1966 |
| Latest release | 21.8 / August 1972 |
| Marketing target | IBM mainframe computers |
| Platforms | S/360, S/370 |
| Kernel type | N/A |
| License | Public domain |
| Succeeded by | OS/VS1, OS/VS2 (SVS) |
| History of IBM mainframe operating systems |
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OS/360, officially known as IBM System/360 Operating System,[1][2] is a discontinued batch processing operating system developed by IBM for their then-new System/360 mainframe computer, announced in 1964; it was influenced by the earlier IBSYS/IBJOB and Input/Output Control System (IOCS) packages for the IBM 7090/7094[citation needed] and even more so by the PR155 Operating System for the IBM 1410/7010 processors.[citation needed] It was one of the earliest[NB 1] operating systems to require the computer hardware to include at least one direct access storage device.
Although OS/360 itself was discontinued, successor operating systems, including the virtual storage MVS and the 64-bit z/OS, are still run as of 2023[update] and maintain application-level compatibility with OS/360.
- ^ IBM Operating System/360 Concepts and Facilities (PDF). IBM. 1965. C28-6535-0.
- ^ INTRO.
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