Xerox 721 Message Manual page 302

GLOSSARY
extended metrics Measurements used in Interpress to alter the size of fonts,
allowing more precision with character escapement. Used for
rendered characters.
FCB forms control buffer. Buffer for controlling the vertical format of
printed output.
FDL forms description language. LPS-resident source language used
for designing electronic forms. See also FSL; form.
feedback Portion of an output signal that is returned, directly or indirectly,
to be compared to a reference signal to maintain the quality of
an output signal.
field 1. Part of a record that serves a similar function in all records of
that group, such as name and address field. 2. Area or setting
of practical activity or application.
file Set of records or text that can be stored and retrieved. An
organized, named collection of records treated as a unit. For
offline, it is the data between the two tape marks. For online, it
is the data between banner pages.
file maintenance To keep a file up to date by regularly adding, changing, or
deleting data.
file protection To prevent the contents on a disk or tape from being erased or
written over by disabling the write head of a unit.
file purging To erase the contents of old files to make room for new data.
firmware Permanent programs stored in read-only memory (ROM).
FIS Font Interchange Standard. Standard that defines the digital
representation of fonts and character metrics for the generation
of an entire series of Interpress fonts.
fixed font Font containing characters with fixed spacing. See also
proportional font.
fixed pitch Font set in which every character cell has the same width. In
reference to character sets, this term describes typefaces in
which all character cells are of equal width. Monospaced as
opposed to proportional spaced.
fixed spacing Arrangement of characters on a line so that all characters occupy
the same amount of horizontal space.
flag Small indicator marking the occurrence of an event or the
existence of a certain condition while the program is executing.
XEROX 4635 LASER PRINTING SYSTEM MESSAGE GUIDE GLOSSARY-9