| EG |
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| EGA |
Enhanced Graphics Adapter. A graphics adapter card that improved on the CGA (Color Graphics Adapter) and was superseded by the VGA (Video Graphics Adapter).
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| EGCS |
Extended Graphic Character Set. A graphic character set in which each character is represented by two bytes.
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| EGP |
Exterior Gateway Protocol. A protocol which gives TCP/IP routing information to a network's exterior gateways: the gateways (routers) that connect the network to other independent networks.
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| EHF |
Extra High Frequency. Electromagnetic frequencies in the range of 30 to 300 gigaherz.
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| EIA |
Electronics Industries Association. An organization which establishes Recommended Standards (RS) for hardware devices and their interfaces. RS-232 is a well-known standard for transmitting serial data by wire.
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| EIA-232D |
Electronics Industries Association -232D. The official designation for RS-232 (Recommended Standard-232), an Electronics Industries Association standard asynchronous serial line which is used commonly for modems, computer terminals, and serial printers. See RS-232.
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| EIDE |
Enhanced Integrated Drive Electronics. A hardware interface which is faster than IDE, allows more memory, and can connect up to four devices (such as hard drives, tape drives, and CD-ROM drives) to the computer.
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| Eight to Fourteen Modulation |
(EFM). In magnetic media, a byte commonly has 8 bits. Optical media such as CD-ROM discs uses a 14-bit byte, a modification necessary because of the way data is stored and read with lasers, using the pits (indentations) and lands (spaces between indentations) on the disc. In transferring from magnetic to optical media, the 8-bit byte has to be modulated to a 14-bit byte. When the computer reads the CD-ROM, an interface card demodulates the 14- bit optical code back to 8-bit code.
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| EISA |
Extended Industry Standard Architecture. A PC bus that extends the ISA bus from 16 bits to 32 bits, but can still be used to plug in ISA expansion cards.
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| eject button |
The button that is pressed to eject a floppy disk or CD-ROM out of a drive.
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| ELAN |
Emulated Local Area Network.
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| Electrically Erasable Programmable Read |
(EEPROM). A memory chip that can be recorded or erased electrically, but that does not lose its content when electrical power is removed. It is called ROM even though it can be recorded, because it takes a lot longer to record than RAM and is only practical for recording data which is not changed often.
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| electricity |
Electric current, caused by the flow of electrons, which can be used as a source of power.
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| electrode |
A device that collects or emits electric charge and controls the movement of electrons.
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| electromagnetic field |
(EMF). A field of force, produced by electric charges and currents, which has both an electric and a magnetic component and contains electromagnetic energy. The properties of electromagnetic fields were outlined by Scottish physicist James Clerk Maxwell in 1865.
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| electromagnetic radiation |
(EMR). Energy in the form of waves which have both an electric and a magnetic component. Electromagnetic radiation includes radio waves, light waves, infrared, ultraviolet, X rays, etc. Computer display screens emit low-level electromagnetic radiation, which is suspected to increase the incidence of cancer, birth defects, and miscarriages. Newer displays emit reduced levels of radiation. The Swedish government established standards (called MPR) for acceptable levels of EMR in display terminals.
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| electromagnetic spectrum |
The entire range of electromagnetic radiation; it includes frequencies of 10^23 cycles per second to 0 cycles per second, and wavelengths from 10^-13 centimeter to infinity. From the lowest frequency to the highest (or the longest wavelength to the shortest) the spectrum includes electric current, heat, radio waves, microwaves, infrared radiation, visible light (colors), ultraviolet radiation, X-rays, gamma rays, and cosmic-ray photons.
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| electromagnetic wave |
A wave that propagates by periodic variations in electromagnetic field intensity and that is within the electromagnetic spectrum.
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| electromagnetism |
Magnetism created by a current of electricity.
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| electron |
A subatomic particle having a negative charge, which circles the nucleus of an atom.
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| electron tube |
An electronic device with a sealed glass or metal container through which a controlled flow of electrons is directed through a vacuum or a gaseous medium. An electron tube containing a vacuum is called a vacuum tube; the first computers used vacuum tubes as on/off switches to indicate the 0s and 1s in digital computations.
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| electronic book |
A book that has been converted to digital form and can be read on a computer, usually via network services or CD-ROM. Electronic books can expand on print media by adding hypertext links, search and cross-reference functions, and multimedia.
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| Electronic Check Project |
A team organized by the Financial Services Technology Consortium (FSTC) to design protocols for E-commerce. The Electronic Check Project is responsible for Signed Document Markup Language (SDML) and the Bank Internet Payment System (BIPS).
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| electronic commerce |
(EC) Using computer networks to conduct business, including buying and selling online, electronic funds transfer, business communications, and using computers to access business information resources.
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