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Glossary
This glossary defines terms and abbreviations in this publication.
Some of the definitions are taken from other glossaries. The letters in the parentheses
that follow some definitions indicate the source of the definition:
(A) The American National Standard Dictionary for Information Systems , ANSI X3.172-1990,
copyright 1990 by the American National Standards Institute (ANSI).
(E) The ANSI/Electronic Industries Association (EIA) Standard-440-A, Fiber Optic
Terminology .
(I) The Information Technology Vocabulary , developed by Subcommittee 1, Joint Technical
Committee 1, of the International Organization for Standardization and International
Electro-technical Commission (ISO/IEC/JTC1/SC1).
(IBM)
The IBM Dictionary of Computing , copyright 1994 by IBM.
(T) Draft international standards committee drafts, and working papers being
developed by the ISO/IEC/JTC1/SC1.
A
access time The time interval between the instant at which a call for data is initialized and
the instant at which the delivery of data is completed. (T)
address A character or group of characters that identifies a register, a particular part of
storage, or some other data source or destination. (A).
alphanumeric A character or group of characters that identifies a register, a particular part of
storage, or some other data source or destination. (A).
B
beginning-of-tape (BOT) The location on a tape where written data begins.
block A collection of contiguous records recorded as a unit. Interblock gaps separate
blocks, and each block can contain one or more records.