ECC memory
(Error-Correcting Code memory) A memory system that tests for and corrects errors on the fly. It
uses circuitry that generates checksums to correct errors greater than one bit.
EDO RAM
(Extended Data Out RAM) A type of dynamic RAM chip
with performance that approaches static RAM. It increases speed by overlapping certain internal
operations and is expected to become popular in the 1995-1996 timeframe.
E-IDE
(Enhanced IDE) A hardware interface that supports up to four IDE
drives, two of which can be CD-ROM or tape. It increases data transfer rate from the original IDE
speed of 3MB up to 13MB and 16MB. Starting in 1994, almost all PCs were shipped with Enhanced IDE
(EIDE) BIOSs, host adapters and drives.
EPP
Enhanced Parallel Port.
An IEEE standard for an enhanced parallel port that is compatible with the Centronics parallel port
commonly used on PCs. The standard also defines the type of cable that must be used in order to
increase distances up to 30 feet and sustain the higher transfer rates.
There are several modes of operation. The EPP (Enhanced Parallel Port) mode provides high-speed
transfer to 500 Kbytes/sec compared to about 150 Kbytes/sec for Centronics. It also allows multiple
devices to be daisy chained from one port. A higher-speed ECP (Enhanced Capabilities Port) mode,
originally developed by Microsoft and HP, provides speeds up to 2Mbytes/sec in each direction. Nibble
and byte modes provide slower bi-directional transfer.
external modem
A self-contained modem that is connected via cable
to the serial port of a computer. It draws power
from a wall outlet. The advantage of an external modem is that a series of status lights on the
outside of the case display the changing states of the modem (off-hook, carrier detect, transmitting,
etc.). In varying degrees, the communications program informs the user as well. However, having
the indicators visible on the unit may be more helpful if a problem occurs. Contrast with
internal modem.
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