DAC— Digital-to-analog converter.
DATA BUS— A bus used to communicate data
internally and externally to and from a pro-
cessing unit, or a storage or peripheral de-
vice.
DBCU— Data bus control unit.
dc— Direct current.
DCE— Data communications equipment.
DCI— Defective card index.
DCU— Display control unit.
DD— Demand digital.
DDI— Demand digital interrupt.
DECODE— To convert data by reversing the effect
of some previous encoding.
Del— Delete.
DEMON— Diagnostic environment monitor.
DFCS— Digital fire control switchboard.
DIBIT (dipole bit)— A form of data prerecorded on
a disk pack during manufacture. Recorded only
on servo tracks of standard disk packs.
DIC— Digital input channel.
DIM/DOM— Digital input multiplexer/digital output
multiplexer.
DIP— Dual-in-line package.
DIP SWITCH— Dual-in-line switch.
DMA— Direct memory access.
DMI— Direct memory interface.
DMOS— Diffused metal-oxide semiconductor.
DMTU— Digital magnetic tape unit.
DOC— Digital output channel.
DOS— Disk operating system.
DOT MATRIX— A matrix of rows and columns of
dots used to generate characters or character
images composed of dots.
dpi— Dots per inch.
DRAM— Dynamic random access memory.
DSR— Data set ready.
DTC— Desktop computer.
DTE— Data terminal equipment.
DTL— Diode-transistor logic.
DTR— Data terminal ready.
EA— Electronic attack.
EAPROM— Electrically alterable programmable
read-only memory.
ECL— Emitter-coupled logic.
EDIT— To prepare data for a later operation.
Editing may include the rearrangement or
addition of data, the deletion of unwanted data,
or the addition/deletion of format control char-
acters.
EEPROM— Electrically erasable programmable
read-only memory.
EF— External function.
EFA— External function acknowledge.
EFM DATA— Eight-to-fourteen modulation data.
Used with CD-ROM.
EFR— External function request.
EGA VIDEO— Enhanced graphics adapter video.
EI— External interrupt.
EIA— Electronics Industry Association.
AI-3
