1. Chp 4: Input and Output Devices
Computer Studies
Chp 4: Input and Output Devices

2. 4.1 Input devices
Input devices lets us enter enter and commands into a computer.
Early computers required the data to be prepared in a form that the
method. The trend of data inputting is towards reducing the number
of keying-in steps. The computer reads data directly from the source.
This is called the direct input method.
This is a input and output devices

3. This is a input
devices method.
Keyboard
The most common method of entering data into a computer is by
typing on a keyboard. A computer keyboard resembles a typewriter
keyboard with additional keys.

4. Pointing devices
1 Mouse
A mouse is the most popular devices . It has a ball-bearing on its
underside. If you put it on, the screen’s mouse will on!
2 Game paddle
A game paddle is a device that lets the user interact with a
computer game1

5. 3 Light pen
A light pen is a light-sensitive pen-shaped device. When placed
against the screen, its positive is detected.
4 Touch screen
Touch screen allow us to select options by
touching the screen without fingers.
5 Digitizer and graphic tablet
It is use for drawing the graphic!

6. Scanning devices
1 Image scanner
It allows direct entry of digital images of pictures and text.
2 Bar Code reader
A bar code reader is usually read the bar code of the something
which is identification the number is or is not true!

7. And the other things items is scanning devices...
Magnetic ink
character recognition
Optical mark recognition
Optical character
recognition

8. Voice-input devices
It use the speech recognition devices make inputting by voice possible.
Digital camera
It functions like an ordinary camera except that the image is stored in
digital format on the camera’s internal memory.

9. 4.2 Output devices
Output devices present information in a form that can be understood
by us.
Visual display units are monitors, which are output on the screen!
Printers
Printers can be divided into two types: Impact printers and non-
impact printers. Impact printers have physical touch, but another
have not physical touch! Dot matrix printer is impact printers, laser
and ink jet printer are non-impact printer!

10. This is different between dot matrix, ink jet and laser printer!
Plotter is the expensive of printers because it is can print out of size is
very big!
Speech synthesizer
It is similar to a speech recognition device, but only in reverse!