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File Number 1401-01
Form G24-1477-0
Systems Reference Library
IBM 1401 Data Processing System
IBM 1401 Data Flow
This publication describes the basic internal operations of the
IBM 1401 Data Processing System to assist operators,
programmers, and systems engineers in their understanding of
the IBM 1401. Card input/output and printer operations are
also included. Each operation is presented in diagram form that
shows the data path during the operation. An explanation of
the steps involved accompanies each data-flow diagram.
Second Edition (May 1967)
This edition is a reprint of the previous edition. The primary
change is the addition of a new cover and table of contents to
conform to the Systems Reference Library format. Minor
changes, which have been marked with a vertical line, have
also been made on the following figures and pages.
It''igure 17, page 20
lPage 35
Figure 43 (2 of 2), page 51
Copies of this and other IBM publications can be obtained through IBM Sales Offices.
This Manual has been prepared by the IBM Systems Development Division,
Product Publications, Dept. 171, P.O. Box 6, Endicott, N.Y. 13760
Address comments regarding this publication to this address.