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Com1, Com port, Control codes – Dell PRECISION 530 User Manual

Page 287

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Glossary

287

CD-R

CD recordable. A recordable version of a

CD

. Data

can be recorded only once onto a CD-R. Once

recorded, the data cannot be erased or written over.

CD-RW

CD rewritable. A rewritable version of a

CD

. Data can

be written to a CD-RW, then erased and written over

(rewritten).

Chip

See

IC

.

CIM

Common Information Model. CIM allows remote

management application programs to access system

management information on a client computer

running any Microsoft Windows

®

OS

that includes

the

WBEM

core components.

Clock Speed

The speed, given in

MHz

, that indicates how fast

computer components operate that are connected to

the system

bus

. The speed is generated by a quartz

crystal on the system board that acts as a kind of

metronome. Components that are synchronized with

the clock speed can run faster or slower, but their

speed is determined by multiplying or dividing a

factor by the clock speed.

cm

Centimeter(s). A measurement of length equal to 0.39

inch.

CMOS

Complementary metal-oxide semiconductor. Memory

chips

that are often used for

NVRAM

storage.

COA

Certificate of Authenticity. The Microsoft Windows

COA is a 25-digit alpha-numeric code located on a

sticker on your computer. You need the COA to

complete the

OS

setup or reinstallation. Also referred

to as the

Product Key

or

Product ID

. For more

information, see http://support.dell.com.

COM Port

A shortened reference to communications port. The

typical designation for a

serial port

connection to a

modem or other serial

device

. Most computers

support one or two serial ports designated as COM1

and COM2.

Control Code

An

I/O

character that causes an action rather than

appears as part of the data. You can input most

control codes by simultaneously pressing the

key and a letter or character on the keyboard. Some

control codes usually have their own assigned keys,

such as , , ,

, and . Different

OSs

and

programs have their own conventions for what effect

certain control codes will have, such as interrupting

the current process or suspending output. Control

codes can also be used to affect an output

device

, such

as causing a printer to start a new line of text.

Controller

Part of a computer, typically a separate circuit board

or

chip

, that allows the computer to use certain kinds

of

devices

. Types of controllers include

hard-drive

,

network, keyboard, interrupt, and graphics

controllers.

COO

Cost of ownership. Business asset data that helps an

organization collect and track information about its

assets. COO data is contained in a file on a computer,

defining the fiscal aspects of the computer, such as

ownership status, warranty information, lease

configuration, acquisition information, and so on.

The computer is a technology investment, and COO

business asset data provides organizations with

information they can use to target the reduction of

maintenance and support costs, as well as to assist

system integrators track the cost of computers they

provide for their customers.