Fujitsu LifeBook N6420 User Manual download pdf (Page 90)

LifeBook N6400 Series User’s Guide

DMA

Direct Memory Access. Special circuitry for memory to

memory transfers of data which do not require CPU

action.

DOS

Disk Operating System (MS-DOS is a Microsoft Disk

Operating System).

Driver

A computer program which converts application and

operating system commands to external devices into the

exact form required by a specific brand and model of

device in order to produce the desired results from that

particular equipment.

DVD

Digital Video Disc. This is a form of optical disc storage

for video, audio and computer data, envisioned to

replace current digital storage formats (CD-ROM, laser

and audio CD) because of its capability for storing

greater amounts of data. A typical single layer, single-

sided DVD, for example, can contain 4.7GB of data and

a maximum of 17GB for the double-sided discs.

ECP

Extended Capability Port. A set of standards for high

speed data communication and interconnection

between electronic devices.

ESD

Electrostatic Discharge. The sudden discharge of elec-

tricity from a static charge which has built-up slowly.

Example: the shock you get from a doorknob on a dry day

or the sparks you get from brushing hair on a dry day.

Extended Memory

All memory more than the 640KB recognized by

MS-DOS as system memory.

FCC

Federal Communication Commission.

Floppy Disk

A spinning platter of magnetic data storage media which

is highly flexible.

Gigabyte.

Hard drive

A spinning platter of magnetic data storage media where

the platter is very stiff.

Hexadecimal

A decimal notation for the value of a 4 bit binary

number. (0-9, A, B, C, D, E, F) Example: 2F in hexa-

decimal = 00101111 in binary = 47 in decimal.

I/O

Input/Output. Data entering and leaving your LifeBook

notebook in electronic form.

I/O Port

The connector and associated control circuits for data

entering and leaving your LifeBook notebook in elec-

tronic form.

IDE

Intelligent Drive Electronics. A type of control interface

for a hard drive which is inside the hard drive unit.

IEEE 1394

A type of data transfer protocol that allows for fast

transfer of digital files and data with devices such as

digital cameras.

IRQ

Interrupt Request. An acronym for the hardware signal

to the CPU that an external event has occurred which

needs to be processed.

Kilobyte.

LAN

Local Area Network. An interconnection of computers

and peripherals within a single limited geographic

location which can pass programs and data amongst

themselves.

LCD

Liquid Crystal Display. A type of display which makes

images by controlling the orientation of crystals in a

crystalline liquid.

Lithium ion Battery

A type of rechargeable battery which has a high power-

time life for its size and is not subject to the memory

effect as Nickel Cadmium batteries.

Megabyte.

Megahertz

1,000,000 cycles per second.

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