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(File No. 5/370-13)

Compatibility Feature
for IBM System/370
Systems I Models 165, 165 II, and 168



The IBM 7070/7074 Compatibility Feature, operating with ORGANIZATION OF THIS PUBLICATION
a complementary set of programs, constitutes the 7074
emulator. Basically, the emulator is a hardware-aided
The information in this manual is organized as follows:
simulator program. It operates much like an interpretive-
routine simulator program, but at a speed about five times Following the Contents is a list of abbreviations and
faster. With the emulator, System/370 Models 165, 165 II, notation forms used in this publication.
and 168 can run 7070 and 7074 programs at speeds that, in The Introduction contains a general description of emula-
general, equal or exceed those of the original systems. tion and provides basic information on the compatibility
feature and the emulator program.
The section "Emulator Organization" describes the func-
tions of the compatibility feature and of the emulator
program and their relationship to each other. This section
The reader of this publication should be familiar with the also includes information on acceptable data formats and
information contained in the following publications: program/feature communication.
IBM 7070-7074 Principles of Operation, GA22-7003 The section "Emulator Instruction Set" describes the
IBM System/370 Systenl Summar)', GA22-7001 format, application, and action of each instruction provided
IBM System/370 Principles of Operation, GA22-7000 by the compatibility feature.
7074 OS Emulator on System/370 Reference, The Appendix contains information concerning conver-
GC27-6948. sion of graphics and internal codes.

Second Edition (June 1973)
This major revision obsoletes GA22-6958-o and Technical Newsletter GN22-o428,
and expands the scope of this manual to include System/370 Models 165 II and
168. Any significant technical change (addition, deletion, or revision) is indicated
by a vertical bar to the left of the change.

Changes are periodically made to the specifications herein; before using this
publication in connection with the operation of IBM systems, refer to the latest
lBAf Syste1n/360 and System/370 Bibliography, GA22-6822 and associated
technical newsletters for the editions that are applicable and current.
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 System Products 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. Comments become
the property of IBM.