Fujitsu 565Tx User Manual page 164

CD-ROM
Compact disc read only memory. This is a form
of digital data storage which is read optically
with a laser rather than with a magnetic head.
A typical CD-ROM can contain about 600MB
of data and is not subject to heads crashing
into the surface and destroying the data when
there is a failure nor to wear from reading.
CHS Translation
Cyl i n der, h e ad and sector tra n s l a ti on . Convers i on
of h a rd disk access ad d ressing to the cyl i n der,
h e ad and sector form . The term i n o l ogy is histori-
cal left from the days wh en data was stored on a
s eries cyl i n d rical dru m s . The head de s i gn a tes the
re ading devi ce , similar to the head on your cas-
s et te recorder on ly mounted on a mova ble arm .
An o t h er ad d ressing met h od is LBA .
CMOS RAM
Com p l em en t a ry metal ox i de sem i con du ctor
ra n dom access mem ory. This is a tech n o l ogy for
m a nu f actu ring ra n dom access mem ory wh i ch
requ i res very low levels of power to opera te .
A p p e n d i c e s
COM Port
Abbrevi a ti on for com mu n i c a ti on port . This is yo u r
s erial interf ace con n ecti on to other equ i pm en t .
Command
An instruction which you give your operating
system. Example: run a particular application
or format a floppy disk.
Configuration
The combination of hardware and software that
makes up your system and how it is allocated
for use.
CRT
Cathode Ray Tube.A display device which uses
a beam of electronic particles striking a lumi-
nescent screen. It produces a visual image by
varying the position and intensity of the beam.
Data
The information a system stores and processes.
DC
Direct current.A voltage or current that does
not fluctuate periodically with time.
L i f e B o o k ™ 5 0 0 S e r i e s f r o m F u j i t s u
Default Value
A preprogrammed value to be used if you fail to
set your own.
DIMM
Dual-in-line memory module.
Disk
A spinning platter of magnetic data storage
media. If the platter is very sti it is a hard disk,
if it is highly flexible it is a floppy disk,if it is a
floppy disk in a hard housing with a shutter it is
commonly called a diskette.
Disk Drive
The hardware which spins the disk and has the
heads and control circuitry for reading and
writing the data on the disk.
Diskette
A floppy disk in a hard housing with a shutter.
DMA
Direct Memory Access.Special circuitry for
memory to memory transfers of data which
do not require CPU action.
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