IBM GA22-7000-4 370 Principles Of Operation Sep75 free download

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GA22-7000-4 File No. S/370-01 IBM System/370 Systems Principles of Operation Page of GA22-70004 Revised September 1, 1975 E:y TNL: GN22-0498 Fourth Edition (September 1974) This major revision obsoletes GA22-7000-3. The revision includes format changes, corrections, and additions. Significant technical changes are indicated by a vertical line to the left of the change. R'equests for copies of IBM publications should be made to your IBM representative or the IBM branch office serving your locality. Changes are made periodically to the information herein; before using this publication in connection with the operation of the System/370, refer to the latest IBM System/370 Bibliography, GC20-0001, and associated technical newsletter, for the editions that are applicable and current. This manual has been prepared by the IBM System Products Division, Product Publica- tions, Dept. B98, PO Box 390, Poughkeepsie, N.Y., 12602. A form for readers' comments is provided at the back of this publication. If the form has been removed, comments may bt: sent to the above address. Comments and suggestions become the property of IBM. ({;) Copyright International Business Machines Corporation 1970, 1972, 1973, 1974 Page of GA22-7000-4 Revised September 1, 1975 By TNL: GN22-0498 Preface This publication provides, for reference purposes, a The information presented in this manual is detailed definition of the machine functions per- grouped into 14 chapters and several appendixes: formed by System/370. IBM System/3 70 highlights some of the major The manual describes each function to the level of features of System/370--particularly those that con- detail that must be understood in order to prepare an stitute advances beyond System/360. assembly language program that relies on that func- System Organization describes the major group- tion. It does not, however, describe the notation and ings within the system--the central processing unit, conventions that must be employed in preparing main storage, and input/output--with some attention such a program, for which the user must instead paid to the composition and characteristics of those refer to the appropriate assembly language manual, groupings. such as the IBM System/360 Operating System Program Execution explains the role of instruc- Assembly Language, GC28-6514. tions in program execution, looks in detail at