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IBM System/370
Systems Principles of Operation
The IBM System/370 is a data processing system that
is based on the IBM System/360 but that extends the
capabilities of that system. This manual describes
extensions to the functional design of the System/360
that are incorporated in models of the System/370.
The reader is assumed to have an understanding of
the System/360, as described in the IBM System/360
Principles of Operation, GA22-6821. The System/370
Princples of Operation should be used in conjunction
with the System/360 Principles of Operation.
For information about the characteristics, functions,
and features of a specific System/370 model, use the
functional characteristics manual for that model.
Preface




Just as the IBM System/360 Principles of Operation is the
machine reference manual for the IBM System/360, this
publication is the machine reference manual for the IBM
System/370. It deals, however, only with those functions
that are additional to or different from those of the
System/360, and the reader therefore must rely directly on
the IBM System/360 Principles of Operation., GA22-6821
Note that this publication is not written as an introduc-
tion or as a textbook but as a reference document. Other
manuals are available that serve those other functions. It
assumes the reader has a basic knowledge of data processing
systems and, specifically, the IBM System/360. Such basic
information can be found, for example, in the Introduction
to IBM Data Processing Systems, GC20-1684, and in the
IBM System/360 System Summary, GA22-6810.
The information in this manual is aimed most directly at
those readers concerned with the preparation of programs
to be run on the System/370, where in such preparation a
knowledge of the machine language and system functions is
pertinent. At the same time, the book contains information
that may be of particular interest to system designers.




First Edition (June 1970)
Requests for copies of IBM publications should be made to your IBM representative
or to the IBM branch office serving your locality.

This manual has been prepared by the IBM Systems Development DiVision, Product
Publications, Dept. B98, PO Box 390, Poughkeepsie, N.Y. 12602. A form for readers'
comments is provided at the back of this publication. If the form has been removed,
comments may be sent to the above address.