IBM GY28-6661-5 Inital Program Loader and Nucleus Initialization Program Rel21 PLM Mar72 free download

File name GY28-6661-5_Inital_Program_Loader_and_Nucleus_Initialization_Program_Rel21_PLM_Mar72.pdf

File No. 5360-36 GY28-6661-5 Program Logic OS Release 21 IBM System/3S0 Operating System Initial Program Loader and Nucleus Initialization Program Program Number 360S-CI-535 This publication presents the internal logic of the IBM System/360 Operating System Initial Program Loader and Nucleus Initialization Program. The operation of the Nucleus Initialization Program in each of the con- trol program environments (MFT, MVT) is described in the section dealing with the Nucleus Initialization Program. Special initialization procedures for MVT with Model 65 multiprocessing systems are included in Appendix A. The ~ables, work areas, and control blocks are illustrated in the publication, as well as flowcharts illustrating the logic flow of the Initial Program Loader and the Nucleus Initialization Program. This program logic manual is directed to personnel responsible for program maintenance. It can be used to locate specific areas of the program, and it enables the reader to relate these areas to the corresponding program listings. Program logic information is not necessary for program operation and use. Sixth Edition (March, 1972) This is a major revision of, and makes obsolete, GY28- 6661-q and its associated TNL GN27-1353. This edition applies to Release 21 of the System/360 Operating Sys- tem and to all subsequent releases until otherwise indicated in new editions or Technical Newsletters. A change is indicated by a vertical line to the left of the change. Changes are continually being made to the specifications herein; before using this publication in connection with the operation of IBM systems, consult the latest System/360 SRL Newsletter, GN20-0360, for the editions that are applicable and current. This publication was prepared for production using an IBM computer to update the text and to control the page and line format. Page impres- sions for photo-offset printing were obtained from an IBM 1Q03 Printer using a special print train. Copies of this and other IBM publications can be obtained through IBM branch offices. A form for reader's comments appears at the back of this publication. Address any additional comments concerning the contents of this publica- tion to IBM Corporation, programming Publications, Department 636 Neighborhood Road, Kingston, New York 12401 ~ Copyright International Business Machines Corporation 1970,1971,1972 PREFACE This publication describes the internal used in the publication, MFT refers to sys- logic and theory of operation of the Ini- tems capable of multiprogramming with a tial Program Loader, which brings in the fixed number of tasks, and MVT refers to programs which become the control program systems capable of multiprogramming with a nucleus, and the Nucleus Initialization v