IBM 2265 Manual page 2

Preface
This SRL publication assumes the reader has a knowledge
of System/360 principles of operation. Therefore, dis-
cussions of such System/360 considerations as instruction
and command structures, Channel Status Word and Pro-
gram Status Word locations and usage, varieties and pri-
orities of interruptions, and generalized capabilities such as
I/O channel status and sense byte usage, command and
data chaining, length suppression, etc., have been kept to
a minimum. This publication does not differentiate be-
tween the various models of System/360; i.e., main storage
capacities, sub channel allocations, sharing and nonsharing
of I/O channel and processor circuitry, and so forth. The
reader is directed to the authoritative source for each
model of System/360, System/360 Functional Character-
istics (by model). Other IBM publications that will be of
use to the reader are:
Third Edition (January, 1970)
I
IBM System/360 Principles of Operation, Form
GA22-6821
IBM 2701 Data Adapter Unit - Component Description,
Form GA22-6864
IBM System/360 Bibliography, Form GA22-6822
IBM Multiplexers and Communications Terminals
Installation Manual- Physical Planning, Form
GA27-3006
Note: In this manual, "I/O (input/output) channel" refers
to a multiplexer channel. This device provides the data
path and controls between the central processor and the
2701 Data Adapter Unit. "Communications channel"
refers to the communications medium (telephone lines,
telegraph, microwave, etc.) used to transmit data, via
appropriate data sets, between the 2701 and the 2265-1/
2845 display system.
This is a major revision of, and obsoletes, Form A27-2731-1 and Technical Newsletter N27-2948.
The significant changes in this edition include the following:
1. The title has been changed to reflect that this publication describes the 2265 Modell; a
reference to the publication that describes the 2265 Model 2 has been added to the abstract.
2. Line Addressing Feature 4802 has been removed and Line Addressing Feature 4801 has
been revised.
3. Installation planning data has been replaced with a reference to the publication that contains
this data.
4. Display station keyboard indicator and pushbutton names have been corrected.
Changes to text and tables are indicated by a vertical line to the left of the change; changed
illustrations are denoted by the symbol. to the left of the caption.
Changes are periodically made to the specifications herein; before using this publication
in connection with the operation of IBM systems, refer to the latest System/360 SRL
Newsletter, Form GN20-0360, for the editions that are applicable.
Text for this manual has been prepared with the IBM SELECTRIC @Composer.
A form is provided at the back of this publication for reader's comments.
If
the form
has been removed, comments may be addJ:essed to: IBM Systems Development Division,
Product Publications, Dept. 520, Neighborhood Road, Bldg. 960-1, Kingston, N.Y., 12401.
©Copyright International Business Machines Corporation, 1967, 1968, 1970