THE multiprogramming system
Operating system
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The THE multiprogramming system or THE OS was a computer operating system designed by a team led by Edsger W. Dijkstra, described in monographs in 1965-66 and published in 1968. Wikipedia
Initial release date: 1968
Programming language: Assembly language
Developer: Eindhoven University of Technology (Technische Hogeschool Eindhoven); Edsger Dijkstra, et al
Final release: Final / 1968; 56 years ago