The title of this manual was formerly IBM Svstem/360 Operating Supervisor Services. The descriptions of the supervisor macro instructions formerly found in IBM Svstem/360 Operating System Supervisor and Data Management Macro Instructions, GC28-66U7 have been added.

This manual describes how to use the services of the supervisor, the macro instructions used to request these services, and the linkage conventions used by the control program to provide these services. Included in the services of the supervisor are program management, task creation and management, and main-storage management.

Intended mainly for the programmer coding in assembler language, this book is a guide to using the macro instructions described. This book does not discuss macro instructions used for graphics, teleprocessing, optical readers, optical reader-sorters, or magnetic character readers. These macro instructions are discussed in separate publications that are listed in the IBM Svstem/360 Biblioqraphy GA22-6822.