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17. An icon is a small picture representing an object, process or
function.
TEXT 9
GATEWAY 2000
The Main Part of the System
There are many hardware pieces in a computer system. Some are: the
system board, power supply, keyboard, mouse, hard drive, monitor and
the video card and its drivers.
The саse
The large metal box that is the main part of the computer is called
the case. The case and its contents (power supply, system board, etc.) are
called the system unit. The case has several functions:
■ Protects the delicate electronics inside.
■ Keeps electromagnetic emissions inside so your TV, cordless
phone, and stereo don't go haywire when you power up the computer.
■ Can also hold the monitor.
Don't remove the case's cover unless you need to do something
inside the unit, and always replace the cover when you are done.
The keyboard
You communicate with your computer with the keyboard. With it,
you type instructions and commands for the computer, and information
to be processed and stored. Many of the keys on the keyboard are like
those on a typewriter: letter keys, punctuation keys, shift keys, tab and
the spacebar. Your keyboard also has many specialized keys.
The instruction manuals for most software applications contain a
section describing the functions of each key or combination of keys.
The mouse
The mouse works by sliding it around (ball down) on a flat surface.
The mouse does not work if you hold it in the air like a remote control.
The desktop is fine, but a ready-made mouse pad is the best surface to
roll the mouse on. Its surface is flat and usually somewhat textured. If a
surface is too smooth or rough, the ball inside can slip. As you glide the
mouse, the ball inside moves in the direction of your movement. You will
see the arrow on your screen moving in unison. The arrow is called a
pointer, and the most important part is the very tip of its point. That's
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the only part the computer pays attention to. To use the mouse, slide it on
the mousepad until the pointer's point is on something, like a button or an
icon. Then:
Click - position the mouse pointer over an element and press and
release the left mouse button one time.
Double-click - same as above except press the mouse button twice in
quick succession without moving the mouse between clicks. It may take a
little practice to not twitch the mouse when you first start double-
clicking. Usually you double-click on an icon to start the program.
Drag - position the mouse pointer over an element, press and hold
the left mouse button, and drag the mouse across the screen. The pointer
moves, dragging the element. At the desired location, release the mouse
button. The pointer lets go of whatever it was dragging.
An excellent way to practice using the mouse is to play the Solitaire
game that comes with Windows.
The monitor
Your computer is not complete without the monitor, a TV-like
device that usually sits on top of the computer. The monitor displays
text characters and graphics. It allows you to see the results of the work
going on inside your system unit. The image that you see is made up of
tiny dots called pixels. The sharpness of the picture depends on the
number and size of these pixels. The more pixels, the sharper the image.
This is called resolution.
A display adapter card is actually what builds the video images; the
monitor simply displays them. The display adapter for your system is
either built onto the system board or is an expansion card plugged into
your system board.
If you sit in front of a monitor for long periods of time, eye strain can
be reduced if you follow a few guidelines:
■ Use the computer in a room with even lighting. Adjust the controls
on the monitor to vary the contrast and brightness of the display to
suit the lighting in the room.
■ Keep the screen clean.
■ Adjust your chair so that you are looking down at the screen at
a slight angle.
■ Turn the monitor away from windows and bright lights to avoid
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