Browse Prior Art Database

IBM System/370 Systems Principles of Operation Disclosure Number: IPCOM000128917D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Sep-20

Publishing Venue

Software Patent Institute

Related People

IBM International Technical Support Center: AUTHOR [+3]


This publication provides, for reference purposes, a detailed definition of the machine functions performed by System/370.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 2% of the total text.

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Reprinted by permission from International Business Machines Corporation copyright 1988

IBM System/370 Systems Principles of Operation

Seventh Edition (March 1980)

Note: The fifth and sixth editions of this publication were inadvertently identified as the fourth and fifth editions, respectively. This edition carries the correct edition number.

This major revision obsoletes GA22-7000-4 and -5 and Technical Newsletters GN22-0498 and GN22-0584. The document has been reorganized and includes Chapter 3, "Storage," which is new and which contains information previously in the chapter "Dynamic-Address Translation," as well as other new information. The chapter "Multiprocessing" has been deleted and the information has been incorporated into Chapter 4, "Control." Many chapters have been extensively revised for clarity.

Because of the extensive reorganization and rewording, it is impractical to identify minor changes. Changes of major technical significance are identified by a vertical bar in the left margin.

Included in this edition are detailed descriptions of the following new items: move inverse, the recovery extensions, and the parts of the extended facility that are independent of the operating system. The move-inverse feature includes the instruction MOVE INVERSE. The recovery- extension feature includes the CLEAR CHANNEL instruction, the machine-check external- damage code and the external-damage-code-validity bit, the channel-not-operational indication, and the logout valid and interface-inoperative bits in the limited channel logout. The parts of the extended facility that are independent of the operating system are the instructions INVALIDATE PAGE TABLE ENTRY and TEST PROTECTION, the common-segment facility, and the low- address protection facility. The parts of the extended facility that are dependent on the operating system are described in the IBM System/ 70 Extended Facility, GA22-7072.

Changes are periodically made to the information herein; before using this publication in connection with the operation of IBM equipment, refer to the latest IBM System/ and 4300 Processors Bibliography, GC20-0001, for the editions that are applicable and current.

It is possible that this material may contain reference to, or information about, IBM products (machines and programs), programming, or services that are not announced in your country. Such references or information must not be construed to mean that IBM intends to announce such IBM products, programming, or services in your country.

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A form for reader's comments is provided at the back of this publication. If the form has been removed, comments may be addressed to IBM Corporation, Product Publications, Dept. B98, PO Box 390, Poughkeepsie, NY...