The document provides a comprehensive overview of input and output devices used in computers, detailing their definitions, types, and functionalities. Key input devices discussed include keyboards, mice, and scanners, while output devices such as monitors, printers, and projectors are also covered. Additionally, it mentions combination devices that handle both input and output, such as fax machines and terminals.

3. 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 the help of input
and output devices.

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

5. Keyboard
“A keyboardis a humaninterface device whichis representedas a layout of button
or keys.”
It has some Features as
• Typewriter keyboard with numerickeypad
• Special purposekeys
• Toggleand combinationkeys

7. Definition :
“An inputdevice usedto control a pointer on thescreen.”
Mouse:
“mousecan be used toControl and manipulatecursor movementon monitor.”
Types of Mouse:
i)Mechanical ii)Optical iii)Cordlessor wireless

8. Some pointing devices are
Trackball
Pointing Stick
Joystick
TouchPad
TouchScreen
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
increases.
Scanner:
“scanners can be usedto copy the image or text on paper
into a digital format that can be used by the computer.”

10. Other Optical Input Devices are:
Opticalscanners
Flatbed
Portable
Bar codereaders:
“A Barcode Reader is an electronic device
which is used for reading printed barcodes.
This device directs a light beamacross the
bar code whileit measures the amount of
light whichis reflected back. “

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

12. Audio Input Devices
Definition:
“Audio input devices recordthe analog sound and convert it into digital form
for further processing.”
Some Audio inputdevices are :
Voice recognition microphone MusicalInstrument DigitalInterface

13. Video Input
Definition :
“ video input devices that can be usedto entering full motion
recording into a computer .“
Some video input devices are
digital camera webcam videocapture card

14. Output Devices
Definition
“Output devices can be usedto receive informationfromthe computer “
The outputcan be in two forms:
Softcopy
Hardcopy

15. Monitor
Definition
“A monitoris a peripheral device whichdisplayscomputer output on a screen. Screen
output is referredto as soft copy”
 Features
 Resolution
 Dotpitch
 Refreshrate
 Size
 Pixel
 Types of monitors
 CathodeRay Tube (CRT)
 LiquidcrystalDisplay(LCD)(digital watches and also DVD and CD players.)
 LED

16. CRT LCD

17. Printer
Definition
“A printer is a peripheral device that producesa physicalcopy or hardcopy of the
computer’s output.”
Types of Printer :
Impact Printers
• f
Non Impact Printers
• LaserPrinter
• Ink-Jet Printer
• Thermal Printer

18. Plotter
Definition
“A plotter is an output device that is usedto produce high
quality graphics in a variety of colors.”
Types of Plotter
FlatbedPlotter
Drumplotter

19. Audio output Devices
Definition
“Audio Output Devices can be used to translates audio
information fromthe computer into sounds that peoplecan
understand.”
 Common audio output devices
 Speakers
 Headphones

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

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

22. Combination Input and Output Devices
Many devices combine input andoutput capabilities
 Faxmachines
 Multifunctiondevices
 Internettelephones
 knownas Telephony
 and Voice-overIP(VoIP)
 Terminals

23. 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. “

24. Terminals
An input and output device
Connects to a mainframe or server
Types of terminals
Dumb terminal
Intelligentterminal
Networkterminal
Internetterminal