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-
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.
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
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
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-
EEPROM Electrically erasable programmable
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.