The GM-NAA I/O input/output system of General Motors and North American Aviation was the first operating system for the IBM 704 computer.^[1][2]

It was created in 1956 by Robert L. Patrick of General Motors Research and Owen Mock of North American Aviation.^[1] It was based on a system monitor created in 1955 by programmers of General Motors for its IBM 701.

The main function of GM-NAA I/O was to automatically execute a new program once the one that was being executed had finished (batch processing). It was formed of shared routines to the programs that provided common access to the input/output devices. Some version of the system was used in about forty 704 installations.^[1]

• SHARE Operating System, an operating system based on GM-NAA I/O.
• Multiple Console Time Sharing System
• Timeline of operating systems
• Resident monitor

• Operating Systems at Conception by Robert L. Patrick
• The World’s First Computer Operating System in millosh's blog talks about the General Motors OS and GM-NAA I/O

Also the developers helped UNIX devs to make the UNIX operating-system

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