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1995 Remembering IBM OS/390 Mainframe Computer Operating System: Original Pre-release Announcement
1995 - IBM OS/390 Mainframe Computer Operating System was introduced in 1995. OS/390 was the successor to MVS/ESA (Enterprise Systems Architecture) and was introduced as part of IBM’s transition to more powerful and scalable mainframe systems in the 1990s. It was designed for the IBM S/390 and zSeries mainframes, providing an integrated, open ...
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