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          GA24-3312-9
          File No. 2821-03




          IBM 2821 Control Unit
Systems   Component Description




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Federal Communications Commission (FCC) Statement

Waming: This equipment generates, uses, and can radiate radio-
frequency energy and, if not installed and used in accordance with the
instructions manual, may cause interference to radio communications.
It has been tested and found to comply with the limits for a Class A
computing device pursuant to Subpart J of Part 15 of FCC Rules, which
are designed to provide reasonable protection against such interference
when operated in a commercial environment. Operation of this equip-
ment in a residential area is likely to cause interference. In which case,
the user, at his own expense, is required to take whatever measures may
be necessary to correct the interference.

The FCC statement above refers to machines manufactured or
reconditioned since 1 January 1981.

PREFACE
This reference publication for system planners, programmers, and
operators 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 IBM 2821 Control
Unit are briefly described. Commands, status and sense information
pertaining to the attached input! output units is presented. Programming
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, Order No. GA21-9033,
IBM 1403 Printer, GA24-3073, and IBM 1404 Printer, GA24-1446.
For further information about input/output and channel operations,
refer to: IBM System/3 60 Principles of Operation, GA22-6821,
and IBM System/3 70 Principles of Operation, GA22-7000.
Other related literature is listed in the System/360 and System/3 70
Bibliography, GA22-6822.




Tenth Edition (October 1982)
This is a reprint of GA24-3073-8, incorporating changes released in Technical
Newsletter GN24-0898 (31 December 1980).
Information in this publication is subject to change. Before using this
publication be sure you have the latest edition and any Technical
Newsletters.
Copies of this and other IBM publications can be obtained through IBM branch
offices. This manual has been prepared by the IBM General Technology
Division, Product Publications, Dept. KlO, P.O. Box 6, Endicott, N.Y.
13760.
                                                                                                     CONTENTS




IBM 2821 CONTROL UNIT.                               5   Special Features. . . 

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