Page 24 - IT-En-V3

The mechanical mouse that relied on a rotating ball initially appeared

At the end of 1999, the optical mouse appeared, which contains the following
components:

• Small digital camera system.

• A red light source (LED) that bounces off the surface on which the mouse
moves.

• The digital signal processor (DSP) examines the captured image and compares it
with the previous image to determine the distance the mouse moved.

2. Keyboard
▪ The keyboard is the main way to enter data into a computer. Can you also
use the keyboard to control your computer? Knowing some simple keyboard
commands (instructions for your computer) will help you work more
efficiently. You can divide the keys on your keyboard into several groups
based on function:
▪ Writing keys (alphanumeric). These keys include the same letter, number,
punctuation, and symbol keys found on a traditional typewriter.
▪ Control keys. These keys are used alone or with other keys to perform
certain actions. The most commonly used control keys are Ctrl, Alt,
Windows logo key) ( , and Esc.
▪ Function keys. Function keys are used to perform certain tasks. These keys
are called F1, F2, F3, and so on, up to F12. The functions of these keys vary
from one program to another.
▪ Navigation keys. These keys are used to navigate documents or web pages
and modify text. They include the arrow keys, Home, End, Page Up, Page
Down, Delete, and Insert.

Numeric keypad:

The numeric keypad is easy to use

for quickly entering numbers. The

keys are grouped together in a

block like a traditional calculator

on a keyboard or on a separate

panel. The following illustration shows how the different keys are arranged
on the keyboard.The following illustration shows how the different

keys are arranged on the keyboard.

17 Training unit in the field of technological information - at the Supreme Council of Universities © Intellectual property rights 2024