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SAA (Systems Application Architecture)

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SAA is a set of application, communication, and user-interface specifications for IBM mainframe operating systems such as VM (Virtual Memory) and MVS (Multiple Virtual Memory), midrange operating systems like OS/400 (for IBM AS/400 series), and OS/2 for desktop systems. SAA defined common applications, which are applications that can run on any SAA platform. Thus, applications written to SAA can run on a wider range of systems. SAA was an attempt by IBM in the 1980s to provide compatibility among its mainframe and minicomputers, which had previously been developed by different IBM divisions.

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