History of IBM mainframe operating systems
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IBM's mainframe operating systems have seldom been very innovative. But the company's long-standing reputation for preferring proven technology has generally given potential users the confidence to adopt new IBM systems fairly quickly, and its long-standing position as the world's largest supplier of mainframe computers has made it a major influence on what users expect of operating systems. Its current mainframe operating systems, z/VSE, z/OS and z/TPF]], are clearly based on those it introduced in the 1960s although of course they have been improved in many ways.