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File No. S360(Mod 20)-01
Form A26-5847-3
Systems Reference Library
IBM System/360 Model 20
Functional Characteristics
This manual contains a description of the complete
Model 20 System and a detailed description of the
processing unit and console. A detailed description of
operation codes and operator information is included.
This publication, Fonn A26-5847-3, is a reprint of Fonn A26-5847-2 incorporating changes
released in the following Technical Newsletters
Form No Dated
N26-0179 15, 16 January 4, 1967
N26-0176 3 to 6, 11, 12, 27, 28, 33 to 36, February 27, 1967
39 to 40. 1, 41, 42, 45 to 50.1,
53 to 54. 1, 57 to 58. 1, 63 to 74. 1,
81 to 82.2, 89 to 91, 105, 106, 109 to 112
N26-0174 iii, iv, 93 to 136 April 4, 1967
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 representative or to the
IBM branch office serving your locality.
Address comments concerning the contents of this publication to IBM Corporation,
112 East Post Road, White Plains, N. Y. 10601 (for the attention of Publishing Operations).