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File No. S360-01
Form A22-6881-2
Systems Reference Library
IBM System/360 Model 40
Functional Characteristics
This manual presents the organization, characteristics, functions
and features unique to the IBM System/360 Model 40. Major
areas described are system structure, generalized information
flow, standard and optional features, system control panel, in-
struction timings, and channel characteristics and functional
evaluation.
Descriptions of specific input!output devices used with the
IBM System/360 Model 40 appear in separate publications. Con-
figurators for the IBM 2040 Processing Unit and I/O devices are
available. See IBM System/360 Bibliography, Form A22-6822.
It is assumed that the reader has a knowledge of the System/
360 as defined in the IBM System/360 Principles of Operation,
Form A22-6821 and the IBM System Summary, Form A22-6810.
SECOND EDITION
This is a major revision of, and obsoletes, Forms A22-6881-0 and A22-6881-1, and Tech.
nical Newsletters N22-0228 and N22-0291. Additional material includes IBM 2400 tape
data in channel evaluation factors, autopolling data for IBM 2702, revision of 2702 work-
sheet example; an additional load limits table on multpilexer in burst mode is included,
as is channel-to-channel feature information. Address switching has been clarified, all
instruction timings (including floating-point) have been revised. An index has been added.
Changes to the text are indicated by a vertical line to the left of the change; revised
illustrations are denoted by the symbol