EIE— External interrupt enable.
EIR— External interrupt request.
EL— Electroluminescent.
EMI— Electromagnetic interference.
ENCODE— To convert information into coded form.
EOT— End-of-tape mark.
EPROM— Electrically programmable read-only
memory.
ESA— Externally specified address.
ESD— Electrostatic discharge.
ESDI— Enhanced small device interface. A fixed
disk interface.
ESI— Externally specified index.
EVEN PARITY— A characteristic of a group of bits
having an even number of binary ONEs.
EW— Electronic warfare.
FAT— File allocation table.
FDDI— Fiber Distributed Data Interface.
FERRITE— A powdered and compressed ferric
oxide material that has both magnetic properties
and light resistance to current flow.
FET— Field-effect transistor. A voltage operated
transistor.
FF— Flip-flop.
FHLT SYSTEMS— Force High-Level Terminal Sys-
tems.
FIBER OPTICS— Conductors or optical waveguides
that readily pass light.
FIFO— First-in, first-out.
FILO— First-in, last-out.
FIRMWARE— Program instructions stored in read-
only memory (ROM) or programmable read-
only memory (PROM).
FIT— Fault isolation table.
FLUX DENSITY— The number of magnetic lines of
force passing through a given area.
FLUX— In electrical or electromagnetic devices, a
general term used to designate collectively all
the electric or magnetic lines of force in a
region.
FM— Frequency modulation.
FONT— A family or assortment of characters of a
given size and style.
FORMAT— The arrangement or layout of data in or
on a data medium.
FORTRAN— FORmula Translation programming
language.
fpi— Frames per inch.
FREQUENCY— The number of complete cycles per
second existing in any form of wave motion,
such as the number of cycles per second of an
alternating current.
FTA— Fast-time analyzer.
GAIN— Any increase or decrease in the strength of
a signal.
GPIB— General-Purpose Interface Bus.
GRAY CODE— A binary code in which sequential
numbers are represented by binary expressions,
each of which differs from the preceding
expression in one place only. Synonymous with
reflected binary code.
HARD COPY— A permanent copy of a display
image that is portable and can be read by
human beings.
HARDWARE— Physical equipment as opposed to
programs (software), procedures, rules, and
documentation.
AI-4
