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File No. S360-01
Form A22-6916-1
Systems Reference Library
IBM System/360 Model 85
Functional Characteristics
This publication describes the organization and the functional
characteristics of the IB:M System/360 Model 85, an information-
processing system designed for very high-speed, large-scale sci-
entific and business applications.
The system components are describ~d, and a detailed con-
sideration is given to the functions of processor storage, the
central processing unit, the input/output channels, and the op-
erator-control and operator-intervention portions of the system
control panel. In addition, certain coding and timing considera-
tions are described.
The reader is assumed to have a knowledge of information-
processing systems and to have read the IBAf System/360 Prin-
ciples of Operation, Form A22-6821. Other related literature is
referenced by form number and briefly described in IBAf Sys-
tem/360 Bibliography, Form A22-6822.
I
SECOND EDITION (June, 1968)
This is a major revision of, and obsoletes, A22-6916-0. The section "System
Controls" has been updated to reflect changes in the system control panel.
The section "Instruction Times" has been updated to include the high-speed
multiply feature times and to reflect changes in the timing formulas. Other
changes to the text are indicated by a vertical line to the left of the change;
changed or added illustrations are denoted by the symbol