4. n
Do you ever
wonder how
information
gets into your
computer and
how comes out
in a form you
can use ? It is
possible with

5. Input
Devices
Definition :
“An
electromechanical device that
can be used to enter data and
instructions into a computer.”

6. Keyboard
“A keyboard is a human interface device which
is represented as a layout of button or keys.”
It has some Features as
• Typewriter keyboard with numeric keypad
• Special purpose keys
• Toggle and combination keys

7. Definition :
“An input device used to control a pointer
on the screen.”
Mouse:
“mouse can be used to Control and manipulate
cursor movement on monitor.”
Types of Mouse :
i) Mechanical
or wireless
ii) Optical
iii) Cordless

8. Some pointing devices
are
Trackball
Pointing Stick
Joystick
Touch Pad
Touch Screen
Light Pen

9. Optical Input
Devices
“optical input devices that uses
light as a source of input. They
eliminate the need for manual
entry of data, thus accuracy
Scanner:
increases.
“scanners can be used to copy
the image or text on paper into a
digital format that can be used
by the computer.”

10. Other Optical Input
Devices are:
Optical scanners
Flatbed
Portable
Bar code readers:
“a barcode reader is an
electronic device which
is used for reading
printed barcodes. This
device directs a light
beam across the bar
code while it measures

11. Character and mark recognition
devices
Scanners that recognize
special characters & marks
Magnetic ink character
recognition (MICR)
Optical-character recognition
(OCR)
Optical-mark recognition (OMR)

12. Audio Input
Definition :
Devices record the analog
“audio input devices
sound and convert it into digital form for
further processing.”
Some Audio input devices are :
Voice recognition
microphone
Musical Instrument Digital

13. Video Input
Definition :
“ video input devices that can be
used to entering full motion
recording into a computer .“
Some video input devices are
digital camera
video capture

14. Output Devices
Definition
“output devices can be used to receive
information from the computer “
The output can be in two forms:
Soft copy
Hard copy

15. Monitor
Definition
“a monitor is a peripheral device which
displays computer output on a screen .
Screen output is referred to as soft
copy”
 Features
 Resolution-pixels
 Dot pitch
 Refresh rat
 Size
 Types of monitors
Cathode Ray Tube (CRT)
 Liquid crystal Display (LCD)


16. Printer
Definition
“a printer is a peripheral device that produces a
physical copy or hard copy of the computer’s
output.”
Types of Printer :
Impact Printers
• Dot Matrix Printer
• Daisy Wheel Printer
Non Impact Printers
• Laser Printer
• Ink-Jet Printer
• Thermal Printer

17. Plotter
Definition
“a plotter is an output device
that is used to produce high
quality graphics in a variety
of colors.”
Types of Plotter
 Flatbed Plotter
 Drum plotter

18. Audio output
Devices
Definition
“audio output devices can be used to
translates audio information from
the computer into sounds that
people can understand.”
 Common audio output devices
 Speakers
 Headphones

19. Projector
Definition
“projector can be used to
displays computer
information on big screen so
that many will able to see
the show.”

20. Computer Output Microfilm
(COM)
 This technology is used to record
computer output as a microscopic
film images.
 Information is recorded on a roll
of film.
 COM devices are used applications
where there are large volumes of
data.

21. Combination Input and
Output Devices
Many devices combine input and output
capabilities
 Fax machines
 Multifunction devices
 Internet telephones
Telephony
 and Voice-over IP (VoIP)
 known as
 Terminals

22. Fax machines
Definition :
“a fax machine refers to a device or
equipment that does telephonic
transmission of scanned material.
It scans the original document and
converts it into a bitmap. It then
uses electronic signals to send the
document to another recipient. “

23. Terminals
 An input and output device
 Connects to a mainframe or
server
 Types of terminals
 Dumb terminal
 Intelligent terminal
 Network terminal
 Internet terminal