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High Quality Content by WIKIPEDIA articles! MVS/XA, or Multiple Virtual Storage/Extended Architecture, was a version of the IBM operating system that is now called z/OS. It was available only on the high-end 43xx, and 308x and later ranges of IBM computers, and was replaced by MVS/ESA, then OS/390 and later z/OS. MVS/XA maintained the same multiprogramming and multiprocessing features supported by its predecessor MVS/370, combined with the capability of simultaneously servicing multiple programs and users. It not only supported virtual storage that was larger than the available real storage,