Dell bpcwcsn_5 - OptiPlex - 740 User Manual page 362

I/O — input/output — An operation or device that enters and extracts data from your computer. Keyboards and printers
are I/O devices.
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.
M
Mb — megabit — A measurement of memory chip capacity that equals 1024 Kb.
Mbps — megabits per second — One million bits per second. This measurement is typically used for transmission speeds
for networks and modems.
MB — megabyte — A measurement of data storage that equals 1,048,576 bytes. 1 MB equals 1024 KB. When used to
refer to hard drive storage, the term is often rounded to 1,000,000 bytes.
MB/sec — megabytes per second — One million bytes per second. This measurement is typically used for data transfer
ratings.
media bay — A bay that supports devices such as optical drives, a second battery, or a Dell TravelLite™ module.
memory — A temporary data storage area inside your computer. Because the data in memory is not permanent, it is
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Glossary