Prefixed Save Area

From Wikipedia, the free encyclopedia

Please help improve this article or section by expanding it. Further information might be found on the talk page or at requests for expansion. (January 2007)

This article or section is in need of attention from an expert on the subject. Please help recruit one or improve this article yourself. See the talk page for details. Please consider using {{Expert-subject}} to associate this request with a WikiProject

This article may require cleanup to meet Wikipedia's quality standards. Please improve this article if you can. (September 2006)

The introduction to this article provides insufficient context for those unfamiliar with the subject. Please help improve the article with a good introductory style.

Prefixed Save Area is a common area of virtual storage from address zero through 8191 in every address space which is often referred to as "Low Core". There is one unique PSA for every processor installed in a system.

The PSA maps architecturally fixed hardware and software storage locations for the processor. Because there is a unique PSA for each processor, from the view of a program running on z/OS, the contents of the PSA can change any time the program is dispatched on a different processor. This feature is unique to the PSA area and is accomplished through a unique DAT manipulation technique called prefixing.