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DBCS. Double-byte character set.
DCF. Document Composition Facility.
developed image. The image that has been exposed
onto the photoconductor and covered with toner by the
developer.
developer mix. A combination of carrier beads and
toner in which the beads electrically charge the toner.
diagnostic. Pertaining to the detection and isolation of
errors in programs and faults in equipment.
diagnostic mode. The operational mode in which the
printer can check itself in case of a malfunction. When
the InfoPrint 3000 is in diagnostic mode, it is not
accepting information from the attached controlling
computer system. In the InfoPrint 3000, only service
representatives can use diagnostic mode. Contrast with
print mode and test mode.
direct attach. The environment in which an
application program directly allocates the InfoPrint
3000 printing subsystem.
dishing. The curve a stack of forms takes when folded
or refolded at the fold perforation.
diskette. A thin, flexible, magnetic disk enclosed in a
protective jacket.
Document Composition Facility (DCF). An IBM
licensed program that provides text formatting for the
InfoPrint 3000.
double-byte character set (DBCS). A set of characters
in which each character is reperesented by a 2-byte
code. Languages such as Japanese, Chinese, and
Korean, which contain more symbols that can be
reprented by 256 code points, require double-byte
character sets. Because each character requires 2 bytes,
the typing, display and printing of DBCS characters
requires hardware and programs that support DBCS.
down fold. Fanfold forms are alternately folded.
When fanfold forms are unfolded and held
horizontally, a fold is a down fold if it points down
from the horizontal surface.
DPE. Decompression Performance Enhancement.
drag. The resistance to forms feeding freely into the
printer; for example, the form rubbing against the
carton.
duplex printing. A mode of printing on both sides of
a form. Contrast with simplex printing.
E
EBCDIC. Extended Binary-Coded Decimal
Interchange Code.
EC. Engineering change.
electronic overlay. A collection of constant data
electronically composed in the controlling computer.
Can be merged with variable data on a page during
printing. An electronic overlay defines its own
environment. It can be in coded form or raster pattern
form. See also preprinted form.
electrophotographic process. The creation of an image
on forms by uniformly charging the photoconductor,
creating an electrostatic image on the photoconductor,
attracting negatively charged toner to the discharged
areas of the photoconductor, and transferring and
fusing the toner to forms.
emboss. To press and raise the surface of paper into a
design. Embossed paper appears thicker than
nonembossed paper, can increase printer wear, and can
degrade print quality.
end-of-forms sensor. A sensor that detects when the
last sheet of a form enters the printer.
error log. (1) A data set or file in a product or system
where error information is stored for later access. (2) A
record of machine checks, device errors, and volume
statistical data.
ESCON. Enterprise System Connection.
ESCON channel. A channel having an Enterprise
Systems Connection channel-to-control-unit I/O
interface that uses optical cable as a transmission
medium.
ESMM. End Select Medium Modification.
Ethernet. A local area network that allows attachments
to transmit on the network without prior coordination.
F
fanfold. Continuous forms that are alternately folded
at regular intervals, usually on a perforation.
Fiber Distributed Data Interface (FDDI). An ANSI
standard for a 100 Mbps LAN using optical fiber
cables.
FLSF. Font Library Service Facility.
fold memory. The ability of a form to refold at the
fold perforation after exposure to heat during the
fusing process.
fold perforation. The perforation on which a form is
folded during manufacture and refolded after printing.
See also page perforation.
Font Library Service Facility (FLSF). A licensed
program that provides a way to make changes to a font
Glossary 299