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GC20-1800-0




IBM Virtual Machine
Facility/370 :
Systems Introduction


The IBM Virtual Machine Facility/370 (VM/370) is a
System Control Program (SCP) that has been designed
specifically for the IBM System/370. VM/370 manages
the IBM System/370 in such a way that mUltiple remote
terminal users appear to have a dedicated computing
system at their disposal. Within this "virtual machine"
the user may run the operaHng system of his choice,
subject to the restrictions noted in "Appendix C:
VM/370 Restrictions" of this manual. The design of
VM/370 is based on the IBM Control Program-67/Cam-
bridge Monitor System (CP-67/CMS) which is executed
on an IBM System/360 Model 67.
The Conversational Monitor System (CMS) is the
major subsystem ofVM/370. CMS provides problem
solving and program development services to the user,
as well as supporting facilities for a remote user who
chooses to run some other operating system in his virtual
machine.
This manual provides introductory information about
the facilities provided by VM/370, and defines the min-
imum equipment configuration necessary for execution.
Preface

This manual provides introductory information on the
IBM Virtual Machine Facility/370 (VM/370) and its
associated subsystem, the Conversational Monitor Sys-
tem (CMS), as well as an overview of the purpose and
functions of VM/370.
It is assumed that the user has a prior knowledge of
virtual storage concepts as implemented on the IBM
System/370 via dynamic address translation. The reader
is referred to Part I of the student text publication
Introduction to Virtual Storage in System/370, Order
No. GR20-4260, for an introduction to the concepts
and advantages of virtual storage.
A basic knowledge of data processing systems, such as
that given in the Introduction to IBM Data Processing
Systems, Order No. GC20-1684, is assumed. More
detailed information about System/370 is available in
the publication IBM System/370 Principles of Opera-
tion, Order No. GA22-7000, and the associated publica-
tion IBM System/360 Principles of Operation, Order
No. GA22-6821. For more information about any
individual System/370 model, see the functional charac-
teristics manual and the guide manual for that model.
When the term 3330 is used in this publication, it
refers to the IBM 3330 Disk Storage, Modell or the
IBM 3333 Disk Storage, Modell.




First Edition (July 1972)
Changes are periodically made to the specifications herein; before using this publica-
tion in connection with the operation of IBM systems, refer to the latest IBM System/360
and System/370 SRL Newsletter, Order No. GN20-3060, 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.
A form for readers' comments is provided at the back of this publication. If the form
has been removed, address comments to: IBM Corporation, Programming Publications
Department, 545 Technology Square, Cambridge, Mass. 02139.