Systems Reference Library IBM System/360 Operating System System Programmer's Guide

• How to maintain the data set cataloging facility of the Operating System and the volume-table-of-contents (VTOC) of a direct-access volume. • How to modify or extend capabilities of the Operat-ing System in the areas of job and job-step accounting ~ processing of magnetic tape labels, and SVC routines. • How to implement the data set protection feature of the Operating System. • How to write a shift initiator program for use when the multiprogramming with a fixed number of tasks (MFT) option is incorporated in the Operating System. • How to use the EXCP (Execute a Channel Program) and XDAP (Execute a Direct-Access Program) macro-instructions, the Resident Access-Method and BLDL Table options, and the tracing routine. Also included are descriptions of system macro-instructions used in modifying the control program. PREFACE This publication consists of self-contained chapters, each of which provides information on how to modify or extend the capabilities of the IBM System/360 Operating System control program. Although the information in one chapter is sometimes related to information in another, all chapters have been written as separate and complete units. Each chapter contains its own introductory section and list of pre-requisite publications. This organization has been used to reduce cross-referencing and to facilitate the addition of new chapters. Third Edition (March 1967) This publication is a revision of Forms C28-6550-0 and C28-6550-1 and obsoletes the previous editions. This publication retains the content of the previous editions, as amended by Technical Newsletters N28-2145