High Quality Content by WIKIPEDIA articles! Z/VSE (Virtual Storage Extended) is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. It is less common than prominent z/OS and is mostly used on smaller machines. Primary z/VSE development occurs in IBM's Boblingen labs in Germany. DOS/360 originally supported 24-bit addressing. As the underlying hardware evolved, VSE/ESA acquired support for 31-bit addressing.

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