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Glossary 103
though they are connected. An LCD screen displays
thousands or millions of pixels.
Plug and Play
A plug and play operating system automatically configures
computer components to work with your system. With this
type of operating system, you normally do not need to set
jumpers on devices or set memory addresses or IRQs.
POST
POST stands for power-on self-test. POST is a test
performed by the computer whenever you turn on the
power. POST checks system integrity.
RAM (random access memory)
The computer's system memory, including conventional
and extended memory. You can write to and read from
RAM. Information stored in RAM is temporary, and is
erased when the system is turned off.
Refresh rate
The refresh rate is the rate at which the image on the LCD
screen is rewritten to the screen. A fast refresh rate helps
keep the image from flickering.
Resolution
The resolution is the sharpness or clarity of the image on
your LCD screen. Resolution is measured by the number of
pixels the computer’s screen can display. For example, a
resolution of 800x600 means that the screen can display 800
pixels in row and can display 600 rows. The more pixels
displayed, the higher the resolution and the better the
image.
ROM (read-only memory)
Permanent computer memory dedicated to a particular
function. For example, the instructions for starting the
computer when you first turn on power are contained in
ROM. You cannot write to ROM. (ROM is not the same as
RAM).
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