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(1) (PhotoRefractive Information Storage Materials Consortium) A collaboration of IBM, Stanford University, GTE, Hughes Research Labs, Optitek, SRI International and Rockwell Science Center that is funded by the U.S. government's Advanced Research Projects Agency for the purpose of researching holographic storage.

(2) (PRogrammable Integrated Scripts for Mirror) The programming language for the Mirror communications programs.

(3) See PR/SM.


(Processor Resource/Systems Manager) Hardware circuits and microcode built into IBM System/390 mainframes that support logical partitions (LPARs). LPARs allow the running of multiple system images on a single processor complex. Each such image has a full complement of CPUs (dedicated or shared), central storage, expanded storage and channels. ESCON and FICON channels may be shared across images using the MIF feature. Pronounced "priz-em," PR/SM was derived from VM, the IBM operating system that provides multiple system images in software. See LPAR, MIF and VM.

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