Access method
APIs in IBM mainframe computer operating systems / From Wikipedia, the free encyclopedia
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See also: Record-oriented filesystem, Record (computer science), Input/Output Control System, and Record Management Services
An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were present in several mainframe operating systems since the late 1950s, under a variety of names; the name access method was introduced in 1963 in the IBM OS/360 operating system.[1] Access methods provide an application programming interface (API) for programmers to transfer data to or from device, and could be compared to device drivers in non-mainframe operating systems, but typically provide a greater level of functionality.
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