High Quality Content by WIKIPEDIA articles! OS/390 is an IBM operating system for the System/390 IBM mainframe computers. OS/390 was introduced in late 1995 in an effort, led by the late Randy Stelman, to simplify the packaging and ordering for the key, entitled elements needed to complete a fully functional MVS operating system package. These elements included, but were not limited to: DFP - Data Facility Product (Provides access methods to enable I/O to DASD subsystems and Tape) JES - Job Entry... Mehr
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