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148 Glossary
I/O address — An address in RAM that is associated with a specific device (such as a
serial connector, parallel connector, or expansion slot) and allows the processor to
communicate with that device.
IrDA — Infrared Data Association — The organization that creates international
standards for infrared communications.
IRQ — interrupt request — An electronic pathway assigned to a specific device so
that the device can communicate with the processor. Each device connection must be
assigned an IRQ. Although two devices can share the same IRQ assignment, you
cannot operate both devices simultaneously.
ISP — Internet service provider — A company that allows you to access its host server
to connect directly to the Internet, send and receive e-mail, and access websites. The
ISP typically provides you with a software package, user name, and access phone
numbers for a fee.
K
Kb — kilobit — A unit of data that equals 1024 bits. A measurement of the capacity of
memory integrated circuits.
KB — kilobyte — A unit of data that equals 1024 bytes but is often referred to as
1000 bytes.
key combination — A command requiring you to press multiple keys at the same
time.
kHz — kilohertz — A measurement of frequency that equals 1000 Hz.
L
LAN — local area network — A computer network covering a small area. A LAN
usually is confined to a building or a few nearby buildings. A LAN can be connected to
another LAN over any distance through telephone lines and radio waves to form a
wide area network (WAN).
LCD — liquid crystal display — The technology used by portable computer and flat-
panel displays.
LED — light-emitting diode — An electronic component that emits light to indicate
the status of the computer.
local bus — A data bus that provides a fast throughput for devices to the processor.
LPT — line print terminal — The designation for a parallel connection to a printer or
other parallel device.
book.book Page 148 Wednesday, December 12, 2007 10:32 AM