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Q petrocelll book neoi york princeton © 1984 by Petrocelli Books , Inc . . Typesetting by Backes Graphics Designed by Diane L. Backes Printed in the United States of America 1 2 7 8 9 10 Library of Congress Cataloging in Publication Data Invitation to MVS . includes index . 1. MV S (Computer system) I . Katzan , Harry . II . Tharayil , D is. III . le . QA76.6.I6 198 1.642 84-6996 ISBN 0-89433-081-0 T o T o Anthony MF K Theresa K A K Tharayil Contents 1 INTRODUCTIO N T O MV S 1 1.1 Evolution of the MV S Environment 1 1.2 Characteristics of the MV S Environment 3 1.3 Software Structure of MV S 4 1.3.1 Job Management 4 /1.3.2 Supervisor Management 6 / 1.3.3 Data Management 8 1.4 Hardware Structure of MV S 1 1 1.4.1 Devices 11 / 1.4.2 Control Units 12 /1.4.3 Channels 13 1.4.4 Main Storage 13 /1.4.5 Central Processing Unit 15 /1.4.6 Program Status 18/1.4.7 Registers 19 1.5 Multiprocessing Systems 19 1.5.1 Tightly Coupled Multiprocessing 19 /1.5.2 Loosely Coupled Multiprocessing 21 1.6 Channel Programming 22 1.6.1 Channel Command 22 / 1.6.2 Transfer In Channel 24 / 1.6.3 Initial Program Loading 24 1.7 Interrupts 25