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                                                        File Number 8360-03
                                                        Form A24-3312-7




Systems Reference Library




IBM 2821 Control Unit
Component Description


This reference publication presents a description of
input/ output operations controlled through the IBM
2821 Control Unit. The IBM 2540 Card Read-Punch
and the IBM 1403 and 1404 Printers controlled by the
IDM 2821 Control Unit are briefly described.
Commands, status, and sense information pertaining
to the attached input/output units is presented. Pro-
gramming timing considerations for control unit,
card reader, card punch, and printers are also
presented.
     For further information about the attached
input/output units, refer to IBM 2540 Card Read-
Punch, Form A21-9033, IBM 1403 Printer, Form
A24-3073, and IDM 1404 Printer, Form A24-1446.
For further information about input/output and      .
channel operations, refer to IBM 8ystem/360
Principles of Operation, Form A22-6821. Other
related literature is listed in IDM 8ystem/360
Bibliography, Form A22-6822.
Eighth Edition, November 1969


This is a reprint of A24-3312-6 incorporating changes released in the following
Technical Newsletter.

       Form Number                                      Date
       N24-0428                                     April 14, 1969

Significant changes or additions to the specifications contained in this publication
are continually being made. When using this publication in connection with the
operation of IBM equipment, check the latest SRL Newsletter for revisions, or
contact the local IBM Branch Office.

Copies of this and other IBM publications can be obtained through IBM Branch
Offices. This manual has been prepared by the IBM Systems Development Division,
Product Publications, Dept. 171, P.O. Box 6, Endicott, New York 13760.
Address comments regarding this publication to the above address.
                                                                                                      CONTENTS




ruM 2821 CONTROL UNIT. .                              5   Special Features. . . . . . . . . . . . .          . . 28
Channels . . . . . .                                  6   Programming Timing Considerations. .                 . 29
Units Controlled . . .                                7   IBM 2540 Use Meter. 

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