I started my career in the seventies, working as a programmer for a Governmental Service Bureau providing service to most of the public sector organizations in my country. We used IBM 360 Mainframes with MVT Operating System . The V did not stand for Virtual (There was no Virtual Storage support), but stood for Variable, because it was an Opertaing System capable of managing Variable length partitions. MVT predecessor SVS ( Single Virtual Storage ), was followed by MVS (Multiple Virtual Storages) Current Mainframe Operating Systems are based upon MVS. ON 1995 it was extended and brnaded as OS/390 . OS/390 was replaced by z/OS Operating System. In the 1990s many people believed that "the Mainframe is dead". However, the Mainframe is still a v aluable and profitable asset for IBM, used by many large enterprises. On J uly 22 2010, IBM announced the new z-E...
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