OS/360 and successors

IBM System/360 Operating System (OS/360)
DeveloperIBM
Written inAssembly language, Basic Systems Language (BSL)
OS familyOS/360 and successors
Initial releaseMarch 31, 1966; 58 years ago (1966-03-31)
Latest release21.8 / August 1972; 52 years ago (1972-08)
Marketing targetIBM mainframe computers
PlatformsS/360, S/370
Kernel typeN/A
LicensePublic domain
Succeeded byOS/VS1, OS/VS2 (SVS)

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 and maintain application-level compatibility with OS/360.

  1. ^ IBM Operating System/360 Concepts and Facilities (PDF). IBM. 1965. C28-6535-0.
  2. ^ INTRO.


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