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File No. S360-O 1
Order No. GA22-6907-3
Systems Reference Library
IBM System/360 Model 91
Functional Characteristics
This publication describes the organization and the functional
characteristics of the IBM System/360 Model 91, an infonnation-
processing system designed for ultrahigh-speed, large-scale sci-
entific and business applications.
The system components are described, and a detailed con-
sideration is given to the functions of processor storage, the
central processing unit, the input/output channels, and the op-
erator-control and operator-intervention portions of the system
control panel. In addition, certain coding and timing considera-
tions are discussed.
The reader is assumed to have a knowledge of information-
processing systems and to have read the IBM System/360 Prin-
ciples of Operation, Form A22-6821.
Fourth Edition (November 1971)
This is a reprint of GA22-6907 -2 incorporating changes released in Technical
Newsletter GN22-0300. This edition, GA22-6907-3, does not obsolete the
previous edition.
Specifications contained herein are subject to change from time to time, Any
such change will be reported in subsequent revisions or Technical Newsletters.
Requests for copies of IBM publications should be made to your IBM repre-
sentative or to the IBM branch office serving your locality.
This manual has been prepared by the IBM Systems Development Division,
Product Publications, Dept. B98, PO Box 390, Poughkeepsie, N.Y., 12602.
A form is provided at the back of this publication for reader's comments. If
the form has been removed, comments may be sent to the above address.