GM-NAA I/O

GM-NAA I/O was the first operating system built for IBM's 704 computer, created in 1956 by Robert L. Patrick of General Motors Research and Owen Mock of North American Aviation. It built on an earlier 1955 system monitor that General Motors programmers had written for the IBM 701. Its main job was to automatically load and run the next program once the current one finished, a form of batch processing, and it supplied shared routines that gave programs common access to input and output devices. Some version of the system was used at roughly forty IBM 704 installations, making it an influential early example of the operating system as a distinct piece of software. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/