Based on Input and output devices in computer. Their history and new technology.

2. GROUP MEMBERS
MAURR GROUP
• M Maria Siddique
• A Ayesha Razi
• U Uzma Yaqeen
• R Rabeaa Ahmed
• R Rabia Khan

3. Do You Ever Wonder How
Information Gets Into
Your Computer And
Comes out in the Form
You Can Use ?????????

4. Input And
Output
devices

5. What are Input Devices ??
Input devices are those devices used to provide data to an
information processing system say computer or other processing
devices
Input
Devices
Keyboard
Point and
draw devices
Scanning
devices
Audio input
devices
Video input
devices

6. First Input Device
• There is no 100% sure info about first input
device but what I find is
• In the early 1950s, Robert Everett developed a
light gun to read the position of a dot on the
screen of the Whirlwind computer for diagnostic
purposes. From some source Robert was a
military agent and With the SAGE air defense
computer, he developed in 1956, the light gun
was identify aircraft of interest by selecting them
on the CRT.

7. Input Devices and their date of
Invention
• 8 April 1868 typewriter
• 1 Jan 1909 joy stick
• 1948 barcode reader
• 1963 scanner
• 1974 touch screens
• 1 June 2011 touch Pads

8. Key Board
 A key board is a human interface device which is represented
as a lay out of buttons and keys.
 Early key boards
 Qwerty
 Punch cards

9. Punch cards
• Stiff paper having related links
terms
Which contains commands for
Controlling automated machine
To read and execute programs
• Punched cards were first used around 1725 by Basile
Bouchon and Jean-Baptiste Falcon (fr) as a more robust form of the
perforated paper rolls then in use for controlling textile looms in
France.
• Acc to some source first input device ever known
• Actually its input and output device
• Related terms and links are punched by the press/keypunch
machines (computers) on stiff paper which is output and computed
again for use in computers which is input method.

10. QWERTY
Consist of rectangular keys
Each key correspond to single
Written symbol
First introduced in in typewriters still
This pattern is used in current Key boards

11. Types of Keyboards
• Standard
• Multimedia keyboards
• Foldable keyboards

12. KEYS
• Function Keys
• Alphabet Keys
• Special keys
• Numeric Pad

13. Pointing And Drawing
Devices
An input device used to control Pointer on screen
MOUSE
MOUSE is Used to Control and Manipulate Cursor movement on Monitor
*Cursor Graphical Pointer
• Traditional mouse
• Optical mouse
• Wireless mouse

14. Early Mouse
Traditional Mouse was a ball built
Bottom with two small rollers placed to
Sides of ball at 90 degree angle to each other
Which spins when the ball rolled
A sensor detects how much a each roller spin
And send info to computer and pointer on screen
To move in same direction.

15. OPTICAL MOUSE
• It is advance pointing device
• It uses LED and optical sensors
To send digital signals to the
System unit
It needs plane surface for high
Performance efficiency

16. Other Pointing Devices
• Touch Pads
• TOUCH screens
• Track ball
• Joy stick
• Light pen

17. Rabeaa Ahmed

18. Scanning Purpose
• Archive-Communicate
– recording a facsimile of an image, such as a form or a signature
for storage, transmission or reproduction.
• Modify-Reproduce
– Capturing an image for display, often with modification, scaling,
cropping, etc.
• Extract-Analysis
– Processing an image for analysis or interpretation,
18

19. Scanners
• Scanners read and
interpret information
on printed matter
• The information is
converted to a format
for storage
19

20. Scanning Devices
Copy data from a source
Scanners take paper and convert it into a bitmap
Types of scanners
Optical scanner
Bar code readers
Character and Mark recognition
20

21. Optical Scanners
• Convert text or drawings into machine
readable format
• Types of optical scanners
– Flatbed scanner
– Portable scanners
21

22. Bar Code Readers
• Photoelectric scanner
• Using Optical Recognition, a light beam scans the item and
changes it into electrical impulses for processing Contain
photoelectric cells that read bar codes
22

23. 23

24. 24

25. OUTPUT DEVICES
Monitors And Printers
MARIA SIDDIQUE

26. Out put
devices
Monitors Printers Speakers Headphones Earphones Plotters projectors

27.  Punch cards can be 1st output device invented
in 1725.
 Calculators are also output devices Wilhelm
Schickard in1623 builds the first mechanical
calculator which could work six digits.
 CRT monitor was the first computer monitor
in 1980.
 First speaker was invented in 1st Jan 1876.

28. Types of monitors
 Monochrome: Display two colors, one for the
background and one for the foreground.
 Gray-Scale: A special type of monochrome monitor
capable of displaying different shades of gray.
 Color: Can display anywhere from 16 to over 1 million
different colors. Sometimes called RGB monitors.

29. Early monitors
CRT monitors
• The first computer monitors used
cathode ray tubes (CRTs)
• Display was monochrome and less sharp.
• By the end of the 1980s color CRT monitors were
available.
• CRTs still offer some image quality advantages
over LCD displays

30. • Macintosh monitor
(1984) monochrome monitor.
Displayed in black and white
• Macintosh II
(1987)supported color video
• RGBMONITORS:
high-resolution, color Graphics
• Multisync monitors
supported a range of resolutions.

31. CRT Monitors
Advantages
• Color
– Most are capable of displaying unlimited colors.
• Resolution
– Multiple video Resolutions.
• Response Time
– Faster response time. Critical to people who play
games on their PC’s
Disadvantage.
– Takes much desktop space

32. LCD MONITORS
First LCD laptop monitors were very
small due to manufacturing costs.
 Light, sleek, energy-efficient, have
 sharp picture
Advantage
 Space saving
 Less Power Consumption and Radiation Emission
 Cause less eyestrain
 Does not flicker or glare
 Available at comparable in screen size as traditional CRT
 DISADVANTAGE
Need a plug interface to connect to the computer

33. Early printers
 invented by Charles BABBAGE
 The system consisted of series of
 metal rods with characters
 printed on them
 stuck a roll of paper against the
rods to print the characters

34. Impact printers
Transfers ink to the media. A print head hits
the surface of the ink ribbon
• Teletypewriter-derived printers
Type box. Prints ten characters/s
• Daisy wheel printers.
Prints 30 characters/s
• DOT MAX Printer
• Line printers

35. Inkjet printer
• a resolution of 300dpi.
• extra-ordinary performance.
• Contains a series of nozzles
• operate by propelling variably
sized droplets of liquid ink onto
almost any sized page the ink is
forced to the paper through nozzles.
A matrix of dots forms characters and pictures.

36. Thermal printers
 used in fax machines.
 Thermal printers use heated pins
and ribbons with different color
bands. The ribbon passes in front
of a print head that has a series of
tiny heated pins. The pins cause the
wax to melt and adhere to the
paper and when temperature
reaches to a certain level, it is hardened.

37. Laser printers
 high quality graphics images.
 Resolution is 600 to 1200dpi.
 Paper is fed and the drum
 rotates.
 A laser beam conveys
 information
 from the computer to a
 rotating
 mirror and thus an image is
 created
 The charges on the drum are ionized
 and the toner sticks to the drum.
 Toner is transferred from drum to paper.

38. SPEAKERS
HEADPHONES AND EARPHONES
Ayesha razi

39. Speakers
 An output device from which
Sounds, music and audio from
Movies or any other program are heard
Speakers are connected
 Internally OR
 externally

40. Computer Speakers
 Internally connected
 Introduced by Altec Lansing in 1900
 Small, plastic, mediocre sound quality
 Low power internal amplifiers
 Connected to computer sound cards
 12mm in diameter 2-pin wire

41. Laptop Speakers
 Laptops also come up with
Integrated speakers also produces
Low quality sound
 These speakers vary widely in quality and price

42. USB ports speaker
 They are connected externally
 Can rock any party
 Powered from5 volts allowing
About output of 2.5 and even more
watts

43. Headphones
 A output hardware device that
Plugs into your computer or speaker
And allows you to privately listen to
Audio without disturbing any one.
110 decibel. loudness

44. Earphones
 Basically tiny speakers to go
inside the ear
 Crystal clear sound Quality
 120 decibel. loudness
 Safety Tip
 No more than 60% volume
 No more for 60 min.

45. HEADPHONES V/S EARPHONES

46. PLOTTERS AND PROJECTORS
Rabya Khan

47. PLOTTERS
 The plotter is a computer printer for printing vector
graphics
 A plotter gives a hard copy of the output. It draws
pictures on paper using a pen.

48. Early plotters
 In the past, plotters were used in applications such as
computer-aided design, though they have been
replaced with wide-format conventional printers
 traditional toner, plotters use a pen, pencil, marker, or
other writing tool to draw a design onto paper

49. Use of Plotters
 plotters are considerably more expensive than printers.
They are used in engineering applications where
precision is mandatory.
 A plotter is a computer hardware device much like a
printer that is used for printing vector graphics.

50. Types of Plotters
• FLATBED PLOTTERS: These hold the paper still while the pen moves.
• DRUM PLOTTERS: These roll a paper over a cylinder.
• PINCH ROLLER PLOTTERS: a mixture of above two

51. Projectors
• A device that projects computer output onto a
white or silver fabric screen that is wall, ceiling
or tripod mounted
• Used in classrooms auditoriums
slide presentations, to display movies.

52. Types of Projectors
• LCD(liquid crystal
display)
• Digital Light
Processing (DLP)
• liquid crystal on
silicon (LCOS)

53. Interesting Facts
DLP is now ready to rock
In 3-D
50,000 hours
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