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Form A22-6821-0
File No. S360-01
Systems Reference Library
IBM System/360 Principles of Operation
This manual is a comprehensive presentation of the
characteristics, functions, and features of the IBM Sys-
tem/360. The material is prescnted in a direct manner,
assuming that the reader has a basic knowledge of
IBM data processing systems and has read the IBM
System/360 Systems Summary, Form A22-6810. The
manual is useful for individual study, as an instruction
aid, and as a machine reference manual.
The manual defines System/360 operating princi-
ples, central processing unit, instructions, system con-
trol panel, branching, status switching, interruption
system, and input/output operations.
Descriptions of specific input/output devices used
with System/360 appear in separate publications.
Also, details unique to each model of the System/360
appear in separate publications.
Copies of this and other IBM publications can be obtained through IBM Branch Offices.
Address comments concerning the contents of this publication to:
IBM Corporation, Customer Manuals, Dept. 898, PO Box 390, Poughkeepsie, N. Y. 12602
Contents
IBM System/360 .................................................................. .. 5 Decimal Arithmetic ................................................................ 34
General-Purpose Design ...................................................... .. 5 Data Format . ' ........................... '.... ............ ................... ....... 34
Compatibility ......................................................................... . 5 Number Representation ................................... 34
System Program ..................................................................... . 5 Condition Code ..... ,................ ,............................................... 35
System Alerts ......................................................................... . 6 Instruction Format .... ......................................................... 35
Multisystem Operation ......................................................... . 6 Instructions ....................... ,........ '............................................. 35
Input/Output ......................................................................... . 6 Add Decimal .............................................