Input devices allow information to enter a computer and include keyboards, mice, scanners, microphones, and cameras. Keyboards and mice are common human interface devices that allow text and cursor control entry. Scanners can digitize text and images while microphones and cameras convert sound and visual recordings. Output devices display or print information from computers using monitors, printers, speakers, and projectors. Monitors provide a soft copy visual output while printers produce a hard copy. Combination devices like fax machines and terminals include both input and output capabilities.

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5. Introduction
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.
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6. Input Devices
Definition :
“An electromechanical device that can be
used to enter data and instructions into a
computer.”
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7. 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
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8. 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 ii) Optical iii) Cordless or wireless
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9. Some pointing devices are :
Trackball
Pointing Stick
Joystick
Touch Pad
Touch Screen
Light Pen
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10. 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 used to copy the image
or text on paper into a digital format that
can be used by the computer.”
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11. 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 the amount of light
which is reflected back. “1/6/2015 11

12. Character and mark recognition devices
Scanners that recognize special
characters & marks
Magnetic ink character recognition
(MICR)
Optical-character recognition (OCR)
Optical-mark recognition (OMR)
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13. Audio Input Devices
Definition :
“Audio input devices record the analog sound and
convert it into digital form for further processing.”
Some Audio input devices are :
Voice recognition Microphone Musical Instrument Digital Interface1/6/2015 13

14. 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 webcam Video capture card
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15. 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
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16. 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)
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17. 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
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18. 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
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19. 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
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20. Projector
Definition
“Projector can be used to displays
computer information on big
screen so that many will able to see
the show.”
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21. 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.
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22. Combination Input and Output Devices
Many devices combine input and output capabilities
 Fax machines
 Multifunction devices
 Internet telephones
 known as Telephony
 and Voice-over IP (VoIP)
 Terminals
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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. “
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24. Terminals
An input and output device
Connects to a mainframe or server
Types of terminals
Dumb terminal
Intelligent terminal
Network terminal
Internet terminal
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25. Reference
 Computer Organization & Design (4th Ed), Patterson and
Hennessy, Morgan Kaufmann 2008.
 Digital Design and Computer Architecture, Harris and
Harris, Morgan Kaufmann 2007.
 Structured Computer Organization (5th Ed),Tannenbaum,
Prentice-Hall 2005.
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