Toshiba Satellite L450 User Manual download pdf (Page 175)

User’s Manual Glossary-9

L450/L450D

interrupt request: A signal that gives a component access to the

processor.

I/O: Input/output. Refers to acceptance and transfer of data to and from a

computer.

I/O devices: Equipment used to communicate with the computer and

transfer data to and from it.

IrDA 1.1: An industry standard that enables cableless infrared serial data

transfer at speeds of up to 4 Mbps.

K: Taken from the Greek word kilo, meaning 1000; often used as equivalent

to 1024, or 2 raised to the 10th power. See also byte and kilobyte.

keyboard: An input device containing switches that are activated by

manually pressing marked keys. Each keystroke activates a switch

that transmits a specific code to the computer. For each key, the

transmitted code is, in turn, representative of the (ASCII) character

marked on the key.

kilobyte (KB): A unit of data storage equal to 1024 bytes. See also byte

and megabyte.

L1 cache: Level one cache. Memory cache built into the processor to help

improve processing speed. See also cache memory, L2 cache.

L2 cache: Memory cache installed on the motherboard to help improve

processing speed. It is slower than L1 cache and faster than main

memory. See also cache memory, L1 cache.

LAN: A group of computers or other devices dispersed over a relatively

limited area and connected by a communications link that enables

any device to interact with any other on the network.

Light Emitting Diode (LED): A semiconductor device that emits light when

a current is applied.

Liquid Crystal Display (LCD): Liquid crystal sealed between two sheets of

glass coated with transparent conducting material. The viewing-side

coating is etched into character forming segments with leads that

extend to the edge of the glass. Applying a voltage between the

glass sheets alters the brightness of the liquid crystal.

main board: See motherboard.

megabyte (MB): A unit of data storage equal to 1024 kilobytes. See also

kilobyte.

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Toshiba Satellite L450 User Manual Page 175