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GC20-1756-2
File No. S370-20




DOS/Virtual Storage
Systems Features Supplement
Release 34

This supplement discusses DOS/Virtual Storage (DOS/VS)
features and organizaiion as of Release 34 .. Only concepts
and functions of DOS/VS that are new to and significantly
different from those of DOS Version 4 are presented in
detail. Transition from DOS Version 4 to DOS/VS is
discussed also.

This supplement is an optional section that is designed to be
inserted in its entirety in anyone of the base guides for
Models 135,138,145,148, and 158 and the 3031 Processor
of System/370. Each of the guides for these processors
contains the conceptual and System/370 hardware infor-
mation required to understand the DOS/VS discussion
presented.

Readers who possess more than one of the base processor
publications need add this supplement to only one of the
documents as the DOS/VS information presented applies to
all supported processors unless otherwise indicated in the text.

The contents of this supplement are designed to acquaint the
DOS Version 4 knowledgeable reader with the new facilities
and the advantages 9f DOS/VS.




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PREFACE

This supplement is stocked in the IBM Distribution Center,
Mechanicsburg as a separate form-numbered item and is not automatically
distributed as part of any other publication. Subsequent updates to the
supplement must also be ordered separately. Those who are familiar with
a System/370 processor and DOS Version 4 and who require information
about DOS/Virtual Storage (DOS/VS) should obtain this supplement and
insert it as Section SO in one of the appropriate base publications
listed below. The features provided by the Advanced FUnctions-DOS/VS
program product.are also highlighted.
Base publications for the DOS/VS supplement are: