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Principles of Operation
Publication Number File Number
Second Edition (January 1987)
This major revision obsoletes SA22-7085-0 and Technical Newslet-
ters SN22-0682 and SN22-0688.
For a summary of changes to the last edition, see the last
section of the Preface.
Except for minor style alterations, changes are identified by a
vertical line to the left of the change.
Changes are made periodically to the information herein; before
using this pUblication in connection with the operation of IBM
equipment, refer to the latest IBM System/370, 30xx, and 4300
Processors Bibliography, GC20-0001, for the editions that are
applicable and current.
References in this publication to IBM products, programs, or
services do not imply that IBM intends to make these available in
all countries in which IBM operates. Any re|