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{{Short description|APIs in IBM mainframe computer operating systems}}
{{See also|Record-oriented filesystem|Record (computer science)|Input/Output Control System|Record Management Services}}
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{{refimprove|date=August 2012}}
{{POV check|talk=NPOV|date=July 2020}}
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] {{webarchive |url=https://web.archive.org/web/20081119054653/http://researchweb.watson.ibm.com/journal/rd/255/auslander.pdf |date=November 19, 2008 }}</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, but typically provide a greater level of functionality.▼
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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.
== Purpose of access methods ==
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* [[Hierarchical Indexed Direct Access Method]] ([[HIDAM]]),
* [[Hierarchical Indexed Sequential Access Method]] ([[HISAM]]),
* [[Hierarchical Sequential Access Method]] ([[HSAM (computing)|HSAM]]),
* [[Overflow sequential access method]] (OSAM),
* [[Partitioned Hierarchical Direct Access Method]] ([[PHDAM]]),
* [[Partitioned Hierarchical Indexed Direct Access Method]] ([[PHIDAM]]),
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