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Field Engineering
Manual of Instruction
2075 Processing Unit -- Volume 1
Comprehensive Introduction
Functional Units
223-2872-1
Form 223-2872-1
FES 526-7033
PREFACE
This is one of six Field Engineering manuals for the FEMI indicate that the figure is contained in the
2075 Processing Unit. These six manuals contain associated FEDM.
the unit theory of operation, reference diagrams to The complete titles and form numbers of the six
be used when troubleshooting, and maintenance pro- 2075 Field Engineering Manuals are:
cedures.
A basic knowledge of the IBM System/360 con- 2075 Processing Unit-- Volume 1, Comprehensive
tained in the IBM System/360 Principles of Opera- Introduction, Functional Units, Field Engineer-
tion, Form A22-6821 is considered a prerequisite ing Manual of Instruction, Form 223-2872
for studying the unit theory of operation. The theory 2075 Processing Unit-- Volume 2, Theory of
of operation is contained in a four volume manual Operation: Storage Bus Control; Instruction
identified as a Field Engineering Manual of Instruc- Preparation; FLT, Logout, MCW; Interrupts,
tion (FEMI). Volume 1 is a prerequisite for the Field Engineering Manual of Instruction, Form
detailed information contained in volumes 2, 3, and 223-2873
4. Volume 1 contains the introduction to the system 2075 ProceSSing Unit-- Volume 3, Theory of
and the processing unit and a description of the Operation: Fixed Point, I Execute, Branch,
functional units (registers, adders, and decoders) of Floating Point, Variable Field Length, Field
the processing unit. Volumes 2 and 3 contain Engineering Manual of Instruction, Form
detailed instruction analYSis, and volume 4 contains 223-2874
detailed information on special features and power 2075 ProceSSing Unit-- Volume 4, Special Fea-
supplies and control. tures, Power Supply and Control, Appendix,
The four volumes of theory of operation contain Field Engineering Manual of Instruction, Form
many references to the diagrams packaged in the 223-2875
associated Field Engineering Diagrams Manual 2075 Processing Unit, Field Engineering Diagrams
(FEDM). All diagrams in the FEDM are identified Manual, Form 223-2876
by a four digit figure number and unless otherwise 2075 Processing Unit, Field Engineering Main-
specified, all four digit figure references in the tenance Manual, Form 223-2880
MAJOR REVISION (December 1965)
This edition, Form 223-2872-1, obsoletes Form 223-2872-0. The
major change is the addition of Figures 10 and 63.
Copies of this and other IBM publications can be obtained through IBM Branch Offices.
Address comments concerning the contents of this publication to:
I IBM Systems Development Division, Product Publications, Dept. 520, CPO Box 120, Kingston, N. Y. 12401