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File No. 1401/1460-30
Form C24-1489-3
Systems Reference Library
Input/Output Control System (on Disk) Specifications
IBM 1401 and 1460
This publication presents the specifications for the
IBM 1401/1460 IOCS (on Disk) Program, Version 2.
It describes the programming required to use IOCS
to control the input/output of data from card reader,
card punch, printer, disk, and tape files. The IOCS de-
scriptive entries (DIOCS and DTF) and macro instruc-
tions are explained in detail. The types of processing
and types of records handled hy IOCS are defined.
The IBM 1401/1460 IOCS (on Disk) program is a
supplement to the IBM 1401/1440/1460 Autocoder (on
Disk) program. The reader should be familiar with
the specifications for this program, described in the
SRL publication, Autocoder (on Disk) Program Specifi-
cations and Operating Procedures, IBM 1401, 1440,
and 1460, C24-3259. For a more complete understand-
ing of the organization of records on disk, he should
also review the disk file-organization routines.
The SRL publication IBM 1401/1460 B-ibliography,
Form A24-1495, lists publications available for other
programming systems.
Minor Revision (November 1964)
This edition, C24-1489-3, is a minor reVISIon of the previous
edition, C24-1489-2, and incorporates Technical Newsletter
N24-0200. The only changes are minor clarifications on pages
9, 28, 50, and 51.