1. Input Devises Keyboard, Mouse Light pen Digital Camera Scanner
Joy stick
Fingerprint scanner
Touch screen
Magnetic strip reader
Graphic tablets
Microphone
Optical character recognition (OCR)
Video recognition

2. Keyboard
Convert letters, numbers and other characters into electronic signals
1.Typing keys
2.Numeric keypad
3.Function keys
4.Control keys

3. QWERTY /ˈkwɜrti/ is the most common modern-day keyboard layout
QWERTY /ˈkwɜrti/ is the most common modern-day keyboard layout. The name comes from the first six keys appearing on the top left letter row of the keyboard and read from left to right: Q-W-E-R-T-Y. The QWERTY design is based on a layout created for the Sholes and Glidden typewriter and sold to Remington in 1873.

4. Mouse Pointing device 1.Ball underneath rolls
2.Laser to sense the motion

5. USB Mouse
PS 2 Mouse

6. Light pen Pointing device
Light sensitive pen like devise ( help to draw )

7. Digital Camera No film roll Capturing videos
Photos can directly move into the
computer without scanning

8. Scanner Convert text, drawing, photos in to digital form that can
Stored and edit in computer

11. Joy stick Joy stick (Pointing device) Pointing devise
Help to play video games

12. Fingerprint scanner Pointing device
Use to scene finger prints for security reasons , or time attendance

13. Touch screen (Pointing device)
Display screen that receives input
from the touch of a finger( ATM screens in banks)
(Input and output both)

14. Magnetic strip reader Used as credit card, railway tickets,
time attendance, debit cards

15. trackball

16. Magnetic Ink Character Recognition, (MICR)
MICR codes can be easily read Cheque
numbers

17. Optical character recognition,(OCR)
Optical character recognition, conversion of images of text into characters

18. OMR- Optical mark recognition
Optical mark recognition is the process of capturing human-marked data from document forms such as surveys and tests.( Eg: MCQ

19. barcode reader (or barcode scanner)

20. Graphic tablets (Pointing device)
Like electronic tracing paper
Use for CAD

21. Microphone
Input sound

22. OUTPUT DEVICES

23. OUTPUT DEVICES 1 . Soft copy 2 . Hard copy printer impact non impact
Monitor
CRT LCD LED
Projector
2 . Hard copy
printer
impact non impact
plotter
3. Sound

24. Out put Soft copy Projector monitor Hard copy Sound PLOTTER CRT LCD
LED
KGHVHJVH
JHGJHYGHJ
KGHVHJVH
JHGJHYGHJ

25. MONITOR (Visual Display Unit )
The computer monitor, screen or VDU (Visual Display Unit) is the most common output device.
Advantages - relatively cheap and reliable, can display text and graphics in a wide range of colours. They are also quiet and do not waste paper.
Disadvantages - no permanent copy to keep and unsuitable for users with visual problems.

26. MONITOR Cathode ray tubes (CRTs) Liquid crystal displays (LCDs)

27. CRT Less Sharpness than LCD Takes large space than LCD Flicker
No limited viewing angle
cheaper than LCD
large energy consumption
when compare with LCD
CRT monitor's response time is negligible

28. LCD Sharp pictures Takes very little space( Slim)
Flicker-free screens are easy on the eyes
limited viewing angle
Fairly expensive
Use less energy and generate less heat than CRTs
Slower response time
(response time is the time it takes for the pixel to update the colours you see on screen.)

29. projector, a device that projects an image on a surface.

30. impact vs non impact printer

31. daisywheel http://www.youtube.com/watch?v=CTBM9JELUYQ
Daisy wheel printing is an impact printing technology invented in 1969

32. Dot-Matrix printer Less expensive Noisy
Producing the image by striking paper through the ribbon
Low quality print out
Very slow

33. Ink Jet-printer Cheaper than laser Not that noisy
Technology-ink flowing through the appropriate nozzles.
Quality than dot matrix
Faster than dot matrix

34. Laser-printer Expensive Very silent in operation Work with toners
Very High quality print outs
Very fast

35. plotter

36. Speakers and head phones
Taking sound out of the computer
Some computer displays have rather basic speakers built-in.
Laptops come with integrated speakers

37. SECONDARY STORAGE Hard Disk Floppy Disk Optical Disk Storage
Magnetic tape

38. Hard Disk
non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces

39. Hard Disk

40. Floppy Disk

41. Floppy Disk 1.44 Mb Disk hidden in a plastic jacket
5¼-inch (133 mm), and the newest and most common 3½-inch (90 mm)
Portable
an outdated medium

42. Zip Disks Zip disk 100-750Mb better than floppy portable and removable
An outdated medium

43. Optical Disk Storage CD- 650-700MB DVD-2GB-8GB
optically written on its surfers
CDROM-compact disk read only memory
WORM-write once read only memory
Rewritable CD.
DVD - Digital video disk /(digital versatile disc)
same dimensions as a CD but stores up to 6 times as much information

45. Digital Versatile Disk (DVD)

46. Magnetic tape Similar to audiotapes store data in serial manner
Accessing speed is Low
Can store very large capacity of data
(used for back ups )

47. Main memory

48. RAM Random access memory
Storing programs witch is currently running and data witch is being processed
Volatile memory
where the information is lost after the power is switched off

49. ROM Read only memory
Contents permanently etched into the memory chip at the manufacturing stage
ROM stands for Read Only Memory, and is a memory chip which only allows data to be read from it, and will not allow data to be written onto it
Non Volatile memory

50. Cache memory
Very fast memory, that is use to improve the speed of the PC
It act as an intermediate store between the CPU and main memory

51. Computer Ports

52. PS/2 connector
A mini DIN plug containing 6 pins. Developed by IBM for connecting the keyboard (purple ) and mouse (green )
Shape -Round

53. Parallel port connector for scanners and printers The 25-pin port

54. Serial Port
A 9-pin D-type connector meeting EIA-232 standard. Possibly used to connect some trackballs, mice, modems and monitors.

55. VGA port
the 15-pin plugs and sockets that connect the computer to the monitor.
used to connect a monitor

56. USB- Universal Serial Bus
A single USB port can be used to connect up to 127 peripheral devices,
FAST
Plug and Play
Hot plugging /hot swapping

57. Hot plugging /hot swapping.
The ability to add and remove devices to a computer while the computer is running and have the operating system automatically recognize the change. Two external bus standards -- Universal Serial Bus (USB ) and IEEE support hot plugging. This is also a feature of PCMCIA.
Hot plugging is also called hot swapping.

58. Ethernet (or Network) Port
used to connect with internet /network

59. Hardware
The term hardware describes the physical parts of your computer which you can physically touch or see such as your monitor, case, disk drives, microprocessor and other physical parts.

61. Software

62. software
collection of computer programs, procedures and documentation that perform some tasks on a computer system.

63. Application Software System Software Hardware USER

64. Application Software
examples of software applications are word processors, spreadsheets, and media players, database applications.

65. System software
System software such as operating systems, which interface with hardware to provide the necessary services for application software,