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z/OS is a 64-bit server operating system from IBM. It is the new name for the existing mainframe system OS/390, combining MVS and UNIX System Services (a mainframe implementation of Unix, formerly known as MVS Open Edition.)

(In the same December 2001 rebrand:


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... as president, until 1985. Brazil has since returned to a popularly elected government and is pursuing further development of its economic standing, both domestically and ...

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