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First released on March 30, 2001 as the successor to its OS/390 operating SYSTEM, z/OS is a 64-bit operating system developed by IBM for IBM's z/Architecture line of mainframe computers.
Benefits of z/OSMost modern computers have a 2 GB limit on the amount of MEMORY that can be addressed in actual program code. However, z/OS uses a customized implementation of Java that allows for a theoretical maximum of 16 exabytes or more than 8 billion times that of a typical computer.
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