Glossary

Glossary

Source Identifiers

This publication includes terms and definitions
from the IBM Dictionary of Computing,
SC20-1699.
Definitions reprinted from the American National
Dictionary for Information Processing Systems are
identified by the symbol (A) following the
definition.
Definitions reprinted from a published section of
the International Organization for Standardization
(ISO) Vocabulary-Information Processing or from a
published section of Vocabulary-Office Machines
developed by Subcommittee 1, Joint Technical
Committee 1, of the International Organization for
Standardization and the International
Electrotechnical Committee (ISO/IEC JTC1/SC1)
are identified by the symbol (I) following the
definition. Because many ISO definitions are also
reproduced in the American National Dictionary for
Information Processing Systems, ISO definitions
may also be identified by the symbol (A).
Definitions reprinted from working documents,
draft proposals, or draft international standards of
ISO TechnicalCommittee 97, Subcommittee 1
(Vocabulary), Joint TechnicalCommittee 1 are
identified by the symbol (T) following the definition,
indicating that final agreement has not yet been
reached among its participating members.
Definitions that are specific to IBM products are so
labeled; for example, “In SNA”,or“In the 3820”.

References

The following cross-references are used in this
glossary:
Contrast with. This refers to a term that has an
opposite or substantively different meaning.
See. This refers the reader to multiple-word terms in
which this term appears.
See also. This refers the reader to terms that have a
related, but not synonymous, meanings.
Synonym for. Thisappears in the commentary of a
less desirable or less specific term and identifies the
preferred term that has the same meaning.
Synonymous with. This appears in the commentary
of a preferred term and identifies less desirable or less
specific terms that have the same meaning.
A
ABIC. See Adaptive Bilevel Image Compression
accumulator. (1)A register in which the result of an
operation is formed. (I) (A) (2)A 3800 hardware feature
that provides a separate storage area to hold data in
raster form. It can be used either for composing a sheet
of data that combines a large amount of variable and
constant data or for storing an electronic overlay in
raster form so that the overlay is merged with variable
data as the page is printed.
Adaptive Bilevel Image Compression (ABIC). A4-bit
image capable of displaying up to 16 shades of gray.
Advanced Function Common Control Unit
(AFCCU). Used to describe all printers that have
controllers based on RS/6000 and Power PC
technology.
Advanced Function Image and Graphics feature. A
hardware feature that can be purchased and installed
on anAFP printer to support printer microcode image
decompression of IOCAdata streams that were
compressed using standard compression routines.AFIG
also corrects the resolution of an input image to match
the printer’s resolution, thereby providing resolution
independence for scanned input.
Advanced Function Presentation (AFP). Aset of
licensed programs, together with user applications, that
use the all-points-addressable concept to print on
presentation devices.AFP includes creating, formatting,
archiving, retrieving, viewing, distributing, and printing
information. See presentation device.
AFCCU. Advanced Function Common Control Unit
AFIG. See Advanced Function Image and Graphics
feature.
AFP. SeeAdvanced Function Presentation.
AFP data stream. A presentation data stream that is
processed inAFP environments. MO:DCA-P is the
strategicAFP interchange data stream, and IPDS is the
strategicAFP printer data stream.
AFPDS. Aterm formerly used to identify the
composed-page MO:DCA-based data stream
interchanged inAFP environments. See also MO:DCA
and AFP data stream.
© Copyright IBM Corp. 2001 193