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File No. 5/360-19
Form A22-6843-3
Systems Reference Library
IBM System/360 I/O Interface
Channel to Control Unit
Original Equipment Manufacturers' Information
This Original Equipment Manufadurers' Information (OE~H)
manual provides the definitions and functional descriptions of
the interface lines for the IB~f I/O Interface - Channel to Control
Unit. In addition, it contains eledrical, mechanical, and cahling
considerations and specifications of this interface.
Preface
The I/O Interface (Channel to Control e nit) is the An interlocked interface operation that is not very
conmnication link between the CPt.' channel and the time-dependent; this feature increases the range
nl.rious I/O control units in the IB~1 System/360. It of control units that may be attached.
employs information formats and control signal se- An operation applicable to both multiplex and burst
quencing to prm'ide uniform means for attaching and mode operations as well as many control opera-
controlling yarious types of control units. tions and channel-to-channel transmissions.
Information. in the form of data, status and sense Cp to eight control units serviced per set of lines.
information. control signals and I/O device addresses,
This Original Equipment I\1anufacturers' Informa-
is transmitted oyer the 34 time- and function-shared
tion (oE~n) I\fanual provides a functional description
lines of this interface. ,\11 transmissions of information
of these lines together with the electrical, mechanical
are interlocked \\'ith corresponding response signals.
and cabling considerations, and specifications of the
The design of this interface provides these impor-
interface. It does not define the interface between
tant features:
control units and I/O devices.
A degree of consistency of input/output program- This publication is open-ended to permit future ex-
ming oyer a \\'ide range of control units. tensions to the I/O interface. The document also pro-
Ready physical connection to System/360 channels vides additional information of interest to designers
of control units designed by any manufacturer and manufacturers of equipment to be attached to the
to operate with this interface. IB~I System/360.
Ability to physically accommodate future control The I/O interface, or any aspect of the I/O interface,
units designed to meet the parameters of this may be altered from time to time by IB:M or may be
interface. withdrawn by IB~I in part or in whole.
FOllfth Edition
This edition, Form A22-G84.'3-:3, ohsoletes Form A22-(i~H'3-2. Significant
challges have heen made throughout the manual, and thi" new editiol1
shouhl he reviewe(l in its entirety.
Sllceifieations contained herein are subject to chang(' from time' to time,
Any such change will he reported in suhsequent revisions or Technical
1'\ ewslcttcrs,
Hequests for copies of IB\l p1lhlications should be made to your IBM rep-
rpscntative or to the IB\I hranch office serving your locality.
This manual has 1>('('11 prepared hy the IBM System ... D(