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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.
GB
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.
KB
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.
MB
Megabyte.
Megahertz
1,000,000 cycles per second.
N6460-Baikal.book Page 80 Friday, June 1, 2007 2:50 PM