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Double-Digit Keying
Pressing two number keys in rapid succession to access a page in a videotex system. The first
number accesses an intermediate index (see Intermediate Page) which in turn accesses the page.
See also Single-Digit Keying.
Dumb Terminal
Terminals that do not contain an intelligent microprocessor and usually send data one character
at a time.
Duplex Transmission
Independent, simultaneous, two-way transmission.
E
EBCDIC
Extended Binary Coded Decimal Interchange Code. An eight bit code used primarily by IBM
equipment.
Echo
The re-transmission of characters received by either the modem or remote system back to the
DTE.
Echoplex
Method of verification of transmitted data by echoing the characters transmitted back to the
source device for verification. Echoplex is sometimes called remote echo and, erroneously, half-
duplex.
EEPROM
Electronically Erasable Programmable Read Only Memory.
EIA
Electronic Industries Association. Organisation in the USA that sets standards for the functional
characteristics of electronic interfaces.
Electronic Mail
A means by which users of a particular bulletin board or videotex system can send messages to
other users of that system. Some dial-up services deal exclusively with providing electronic mail
facilities.
E-MAIL
See Electronic Mail.