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An '''access method''' is a function of a [[mainframe computer|mainframe]] [[operating system]] that enables access to data on disk, tape or other external devices. They were introduced in 1963 in IBM [[OS/360]] operating system.<ref name=aus>[http://researchweb.watson.ibm.com/journal/rd/255/auslander.pdf M. A. Auslander, D. C. Larkin, A. L. Scherr: "The Evolution of the MVS Operating System", pages 478-479] {{wayback|url=http://researchweb.watson.ibm.com/journal/rd/255/auslander.pdf |date=20081119054653 }}</ref> Access methods provide an [[API|application programming interface (API)]] for programmers to transfer data to or from device, and could be compared to [[device driver]]s in non-mainframe operating systems.
== Purpose of access methods ==
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