IBM AT 5170 Technical Reference page 456

processing by human or automatic means. (2) Any
representations, such as characters or analog quantities, to which
meaning is, or might be assigned.
data base. A collection of data that can be immediately accessed
and operated upon by a data processing system for a specific
purpose.
data processing system. A system that performs input,
processing, storage, output, and control functions to accomplish a
sequence of operations on data.
data transmission. Synonym for transmission.
dB. Decibel.
dBa. Adjusted decibels.
dc. Direct current.
debounce.
(1)
An electronic means of overcoming the
make/break bounce of switches to obtain one smooth change of
signal level.
(2)
The elimination of undesired signal variations
r--..
caused by mechanically generated signals from contacts.
decibel.
(1)
A unit that expresses the ratio of two power levels
on a logarithmic scale.
(2)
A unit for measuring relative power.
decoupling capacitor. A capacitor that provides a low impedance
path to ground to prevent common coupling between circuits.
Deutsche Industrie Norm
(DIN). (1)
German Industrial Norm.
(2)
The committee that sets German dimension standards.
digit.
(1)
A graphic character that represents an integer; for
example, one of the characters
0
to
9. (2)
A symbol that
represents one of the non-negative integers smaller than the radix.
For example, in decimal notation, a digit is one of the characters 0
to
9.
Glossary-to