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Enterprise Systems Architecture/370™ (ESA/370™) is the next step in the architectural evolution of IBM's large processors from System/360 to System/370 to System/370 Extended Architecture (370-XA). ESA/370 includes all of the facilities of 370-XA and also significant new facilities. It greatly increases the amount of apparent main storage that is readily available for use. It provides for more efficient secure program linkage, with increased status saving and restoring, among hierarchically or nonhierarchically organized programs. It allows improved control program efficiency.
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