OS/360 and successors
Operating system
OS/360, officially known as IBM System/360 Operating System, is a discontinued batch processing operating system developed by IBM for their then-new System/360 mainframe computer, announced in 1964; it ... Wikipedia
Initial release date: November 1965
Programming languages: Assembly language and IBM PL/S
Developer: IBM and Fred Brooks
Latest release: 21.8 / August 1972; 51 years ago
License: Public domain