This section lists early operating systems of the 1950s and early1960s that are primarily of historical interest. Most of these systems were batch systems or single job monitors for large computers. Early examples of other categories, such as timesharing, minicomputer, or real-time systems, are listed with their respective sections. Atlas I Supervisor Supervisor Program for the first computer designed to use an operating system.
Introduced system calls and virtual storage.
Operating System developed by North American Aviation for the IBM 709. A very early operating system developed by General Motors for the IBM 701. Operating System for the Honeywell 800. One of the earliest OSs for minis. The first major transaction processing system, developed by IBM and American Airlines for the IBM 7090.