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File Number S360-30 (OS) Order Number GY28-6616-9 Program Logic os I/O Supervisor Logic Release 21 Program Number 360S-CI-505 This publication describes the input/output supervisor, which consists of the control program routines that carryon input/output activity for the IBM Operating System. Input/output supervisor routines start, monitor, and, where necessary, restart activity on input/output devices. Hollowing an introduction, there is a Method of Operation section in this publication which is organized to reflect the sequence of events that takes place when the input/output supervisor receives a request for input/output (I/O) activity: Validating Input Data Scheduling I/O Operations Starting I/O Operations Terminating I/O Operations Restarting I/O Operations Recording Error Data The remaining sections of this publication support the Method of Operation section, and include descriptions of program organization, directories for PLM-to-listing and listing-to-PLM transitions, descriptions of data areas, diagnostic aids, and appendixes. This manual is intended for persons involved in program maintenance, and system programmers who are a ring the program design. Program logic information is not necessary for the use and operation of the program. Page of GY28-6616-9 Revised April 30, 1973 By TNL GN26-8036 Tenth Edition (February 1972) This edition, as amended by technical newsletter GN26-8036, applies to Release 7J-:z-0fthe Operating System (OS) and to all subsequent releases until otherwise indicated in new editions or technical newsletters. Information in this publication is subject to