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This paper discusses the design considerations for the architectural extensions that distinguish Systeni/370 from Systeni/360. It comments on some experiences with the original objectives foi* System/360 and on the efforts to achieve them, and it describes the reasons and objectives for extending the architecture. It covers virtual storage, program control, data-manipulation instructions, timing facilities, multiprocessing, debugging and monitoring^ error handling, and input/output operations. A final section tabulates some of tbe important parameters of the vaiious IBM macbines wbich implement the architecture.

This paper reviews the overall objectives and the design considerations that led to the System/370 Extended Architecture (370-XAj. It presents an overview of the differences between the System/370 and 370-XA architectures and summarizes all architectural extensions, deletions, and changes. Then it describes in more detail the extensions for interpretive execution, protection, tracing,

The evolution of modern large-scale computer architecture within IBM is described, starting with the announcement of Systeml360 in 1964 and covering the latest extensions to System/370. Emphasis is placed on key attributes and on the motivation for providing them, and an assessment is made of the experience gained in the implementation and use of the architecture. The main approaches are discussed for obtaining implementations at widely differing performance levels, and a number of significant implementation parameters for all processors are listed.When System/360 development was initiated, most new computer models were, from the viewpoint of their logical structure, improved, enlarged, or technologically recast versions of the machines developed in the early Copyright 1981 by International Business Machines Corporation. Copying is permitted without payment of royalty provided that (1) each reproduction is done without alteration and (2) the Journal reference and IBM copyright notice are included on the first page. The title and abstract may be used without further permission in computer-based and other information-service systems. Permission to republish other excerpts should be obtained from the Editor.