The GM-NAA I / O (entry / exit system for General Motors and North American Aviation) is the first operating system in the history of computing.
It was created in 1956 by Robert L. Patrick of General Motors and Owen Mock of North American Aviation for an IBM 704 computer. The basis of its construction was the monitor system created in 1955 by General Motors programmers for its IBM 701.
GM-NAA I / O, whose main function was to automatically execute a new program once the one that was running finished, was formed by some routines accessible to the programs that provided a common access to the input / output devices. .
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