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       dr) ~5~           Field Engineering
                         Theory of Operation




Multiplexer Channel
( 60,000 and 70,000 Series)


                                             SY27-2300-1
 PREFACE                                                                    Because Engineering Changes may periodically
                                                                         obsolete portions of this manual, the latest level
                                                                         logic diagrams should be used as the final authority.
This manual presents the fundamental concepts and
operational principles for the 2870, 2870A, and
2870B :Multiplexer Channels. The machine type                            Note: References in this manual to COD (Channel
suffix letters are determined by the system attach-                      Operation Diagram) and lOP (I/O Operation)
ment and channel serial numbers. The channel                             diagrams relate to diagrams contained in Field
designations are:                                                        Engineering Diagrams Manual, IBM 2870 Multi-
                                                                         plexer Channel (60,000 and 70,000 Series),
     System/360 models (not including the Model 195)                     SY27-2301.
       2870   Ser. No. 60,000 and 60,002-69,999                             Additionally, references to flowcharts (FC:XXX)
       2870A Ser. No. 60,001 and 70,000 Series                           also appear throughout the text of this and other
                                                                         chapters; these relate to the autocharts contained
     System/370 models (including the System/360                         in Volume 1 of the 2870 ALDIs.
     Model 195)
       2870B 70,000 Series                                                   Manuals associated with this publication are:
                                                                             Field Engineering Diagrams Manual, IBM 2870
    The information contained herein relates princi-                          Multiplexer Channel, SY27-2301.
pally to the 2870A as a basis for data presentation.                         Field Engineering Maintenance Manual, IBM
\\"hen the 2870 differs slightly from the description                         2870 Multiplexer Channel, SY27-2302.
provided for the 2870A series machines, the differ-
ence is shown in parentheses with an asterisk (*).
For example, the 2870 has eleven (*seven) levels of
priority. It is assumed that the reader has a basic
knowledge of the System/360 and System/370 funda-
mentals of operation and standard I/O interface.




Second Edition (April 1973)
This is a reprint of SY27-2300-0 incorporating changes released in the following Technical
Newsletters:
            SY22-691S (dated September 20, 1972)
            SY22-6926 (dated February 22, 1973)

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

This manual has been prepared by the IBM System Products Division, Product Publications,
Dept. B97, PO Box 390, Poughkeepsie, N. Y. 12602. A form is provided at the back of
this publication for reader's comments. If the form has been removed, comments may
be sent to the above address.

 

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