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File No. S360-05
Form A22-6866-4

Systems Reference Library

IBM System/360 Component Description
2400-Series Magnetic Tape Units,
2803/2804 Tape Controls, and
2816 Switching Unit, Model 1

This manual contains a comprehensive presentation of the character-
istics, functions, and features of the IBM 2400-Series Magnetic Tape
Units, 2803/2804 Tape Controls, and a general description of the
IBM 2816 Model 1 Switching Unit. The 2400-series consists of the
2401, 2402, and 2420 Magnetic Tape Units, and 2403, 2404, and
2415 Magnetic Tape Units and Controls.
~ most instances, operational descriptions are limited to the
channel and command level. Operating functions and procedures
common and fundamental to all I/O operations are described in IBM
System/360 Principles of Operation, Form A22-6821.
Subjects covered include magnetic tape unit principles; keys and
lights; tape load, unload, and cleaning procedures; status and sense
information; magnetic tape handling; tape block and reel organiza-
tion; and error recovery procedures.
Preface

Th.e terms "2400 series" or "2400 Magnetic Tape Units"
used in this manual refer to the 2401, 2402 Models 1-6
and 2420, Model 7 Magnetic Tape Units; 2403, 2415
Models 1, 2, 3, and 4, 5, 6 Magnetic Tape Units and
Controls; and 2404 Models 1, 2, and 3 Magnetic Tape
Units and Controls. The infonnation in this manual
applies to all these under the title of 2400 Tape Units
unless otherwise stated. All statements refer to basic
models unless qualified to include special features. State-
ments that refer to NRZI operations refer to 2401-2404
Models 1-3 and 2415 Models 1-3 (which always operate in
the NRZI mode), and to 2401-2403 Models 4-6 and 2415
Models 4-6 when operating in the NRZI mode. State-
ments that refer to PE operations refer to 2401-2403
Models 4-6, 2415 Models 4-6, and 2420 Model 7, because
only these tape units can operate in the PE mode.

Fifth Edition (September 1968)
This is a major revision of, and obsoletes A22-6866-3 and Technical Newsletter
N22-0261. This manual has been entirely rewritten to include the new 2420
tape unit. Other changes to the text, and small changes to illustrations, are
maIked by a vertical line to the left of the change; changed or added
illustrations are denoted by the symbol. to the left of the caption.

Changes are periodically made to the specifications herein; any such changes will
be reported in subsequent revisions or Technical Newsletters.

Re:quests for copies of IBM publications should be made to your IBM
representative or to the IBM branch office serving your locality.

This manual was prepared by the IBM Systems Development Division, Product
Publications, Dept. 265, P. O. Box 1900, Boulder, Colo. 80302. A form is
provided at the back of this publication for readers' comments. If the form has
been removed, comments may be sent to the above address.
Contents

Magnetic Tape Unit Principles