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Field Engineering
Theory of Operation




Restricted Distribution

This manual is intended for internal use only and may not be used
by other than IBM personnel without IBM's written permission.

Specifications contained herein are subject to change without
notice. Revisions and/or supplements to this publication wi"
be issued periodically.




Systern/360 Model 50
Multiplexor Channel
PREFACE

This manual describes input/output (I/O) operations
on the IBM System/360 Model 50 Multiplexor Channel.
To understand channel theory as presented, the reader
should first study other System/360 Model 50 Manuals
that explain parts of the 2050 Processing Unit.
Field Engineering Manuals on the 2050 Processing
Unit for System/360 Model 50 include:
Comprehensive Introduction, Form Y22-2821
Read Only Storage, Form Y22-2823
Op Codes RR and RX, Form Y22-2824
Op Codes, RS, SI, and SS, Form Y22-2825
Main Storage, Local Storage, Storage Protect,
Form Y22-2828




RESTRICTED DISTRIBUTION: This publication is intended for use by IBM personnel
only and may not be made available to others without the approval of local IBM
management.

Third Edition
This manual obsoletes Form Z22-2827-1. Changes to the text of the earlier publication
are'indicated by a vertical line to the left of the change; revised or new illustrations are
denoted by the symbol (e) to the left of the caption. "Multiplexor Channel ROS Routines, "
which begins on page 44, is extensively revised and should be reviewed in its entirety.

Significant changes or additions to the specifications contained in this publication
will be reported in subsequent revisions or FE Supplements.

This manual has been prepared by the IBM Systems Development DiviSion, Product
PublicatiOns, Dept. B96, PO Box 390, Poughkeepsie, New York 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.