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DTR. In the IBM Personal Computer, data terminal ready.
Associated with modem control.
dual in-line package (DIP). A widely used container for an
integrated circuit. DIPs have pins in two parallel rows. The pins
are. spaced 1/10 inch apart. See also DIP switch.
duplex. ( 1) In data communication, pertaining to a simultaneous
two-way independent transmission in both directions.
(2) Contrast with half-duplex.
duty cycle. In the operation of a device, the ratio of on time to
idle time. Duty cycle is expressed as a decimal or percentage.
dynamic memory. RAM using transistors and capacitors as the
memory elements. This memory requires a refresh (recharge)
cycle every few milliseconds. Contrast with static memory.
EBCDIC. Extended binary-coded decimal interchange code.
ECC. Error checking and correction.
edge connector. A terminal block with a number of contacts
attached to the edge of a printed-circuit board to facilitate
plugging into a foundation circuit.
EIA. Electronic Industries Association.
electromagnet. Any device that exhibits magnetism only while an
electric current flows through it.
enable. To initiate the operation of a circuit or device.
end of block (EOB). A code that marks the end of a block of
data.
end of file (EOF). An internal label, immediately following the
last record of a file, signaling the end of that file. It may include
control totals for comparison with counts accumulated during
processing.
end-of-text (ETX). A transmission control character used to
terminate text.
Glossary-12
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