Computer can classified in to five types according to
generations i.e time period
. First generation computer
. Second gen...
. First generation computer
Period : 1945 – 1956
Inviter : Lee de Forest
Main processing device : Vacuum tubes
Vacuum tube
Vacuum tube
Vacuum tube
Vacuum tube
Vacuum tubes
Observing Vacuum tube
Observing Vacuum tube
Vacuum tube tester
Punched curds
Punched card voting Punched card decks
Punched cards models
Large punched cards
. First generation computer
Advantages :
. It was only electronic device
. First device to hold memory
Disadvantages :
. T...
Too bulky i.e large in size
Vacuum tubes burn frequently
Maintenance problems
. Second generation computer
Period : 1956 – 1963
Inviter : William Shockley
Main processing device : Transistor
Storage m...
Transistor
1 2
Transistor board
. Second generation computer
Advantages :
. Size reduced considerably
. The very fast
. Very much reliable
Disadvantages :...
. Third generation computer
Period : 1964 – 1971
Inviter : Jack Kilby
Robert Noyce
Main processing device : IC (integrated...
IC (integrated circuit)
ICs (integrated circuits)
IC (integrated circuit)
. Third generation computer
Advantages :
. ICs are very small in size
. Improved performance
. Production cost cheap
Disad...
. Fourth generation computer
Period : 1971– present
Inviter : Ted Hoff
Main processing device : ICs with VLSI
(Very Large ...
ICs with VLSI
(Very Large Scale Integration)
. Fourth generation computer
Advantages :
. It is a compact
. Less power consumption
. Production cost is cheap
Disadvanta...
. Fifth generation computer
Period : present and beyond
Main processing device : ICs with parallel
processing
Storage medi...
. First generation computer . Second generation computer
. Third generation computer . Fourth generation computer
. Fifth ...
Computer is a group of electronic devices used to
process the data.
The characteristics of a computer are:
4. Accuracy
5. ...
1. Speed: computer process the data at an
unimaginable speed. The speed of the computer
ranges up to Nano seconds.
2. Reli...
4. Accuracy: Accuracy of the computer is very
high it performs calculation with greater accuracy
in less time.
5. Automati...
6. functionality: computer can performs many kinds
of jobs. They not process the data but also can be
Used for plying musi...
genarations of  computers
genarations of  computers
genarations of  computers
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genarations of computers

  1. 1. Computer can classified in to five types according to generations i.e time period . First generation computer . Second generation computer . Third generation computer . Fourth generation computer . Fifth generation computer
  2. 2. . First generation computer Period : 1945 – 1956 Inviter : Lee de Forest Main processing device : Vacuum tubes
  3. 3. Vacuum tube
  4. 4. Vacuum tube
  5. 5. Vacuum tube
  6. 6. Vacuum tube
  7. 7. Vacuum tubes
  8. 8. Observing Vacuum tube
  9. 9. Observing Vacuum tube
  10. 10. Vacuum tube tester
  11. 11. Punched curds
  12. 12. Punched card voting Punched card decks
  13. 13. Punched cards models
  14. 14. Large punched cards
  15. 15. . First generation computer Advantages : . It was only electronic device . First device to hold memory Disadvantages : . Too bulky i.e large in size . Vacuum tubes burn frequently . They were producing heat . Maintenance problems
  16. 16. Too bulky i.e large in size
  17. 17. Vacuum tubes burn frequently
  18. 18. Maintenance problems
  19. 19. . Second generation computer Period : 1956 – 1963 Inviter : William Shockley Main processing device : Transistor Storage media : Magnetic disc
  20. 20. Transistor 1 2
  21. 21. Transistor board
  22. 22. . Second generation computer Advantages : . Size reduced considerably . The very fast . Very much reliable Disadvantages : . They over heated quickly . Maintenance problems
  23. 23. . Third generation computer Period : 1964 – 1971 Inviter : Jack Kilby Robert Noyce Main processing device : IC (integrated circuit) Storage media : Floppies
  24. 24. IC (integrated circuit)
  25. 25. ICs (integrated circuits)
  26. 26. IC (integrated circuit)
  27. 27. . Third generation computer Advantages : . ICs are very small in size . Improved performance . Production cost cheap Disadvantages : . ICs are sophisticated
  28. 28. . Fourth generation computer Period : 1971– present Inviter : Ted Hoff Main processing device : ICs with VLSI (Very Large Scale Integration) Storage media : Floppies, CDs.
  29. 29. ICs with VLSI (Very Large Scale Integration)
  30. 30. . Fourth generation computer Advantages : . It is a compact . Less power consumption . Production cost is cheap Disadvantages : . No artificial intelligent.
  31. 31. . Fifth generation computer Period : present and beyond Main processing device : ICs with parallel processing Storage media : Video disks Advantages : . Artificial intelligence . Expert system
  32. 32. . First generation computer . Second generation computer . Third generation computer . Fourth generation computer . Fifth generation computer Vacuum tubes Transistors ICs ICs with VLSI ICs with parallel processing
  33. 33. Computer is a group of electronic devices used to process the data. The characteristics of a computer are: 4. Accuracy 5. Automation 6. Functionality 7. Tirelessness 1. Speed 2. Reliability 3. Memory capacity
  34. 34. 1. Speed: computer process the data at an unimaginable speed. The speed of the computer ranges up to Nano seconds. 2. Reliability: The next important characteristic of a computer is its reliability. we can always rely on the information given by a computer. 3. Memory capacity: The memory capacity of a computer is measured in in bits and bytes. Large amount of the data can be stored in computer and retrieved. Memory capacity of the computer ranges in Giga bytes.
  35. 35. 4. Accuracy: Accuracy of the computer is very high it performs calculation with greater accuracy in less time. 5. Automation: a computer allows automation for any process designed in the from of a program. A program can be executed any number of times to repeat the process.
  36. 36. 6. functionality: computer can performs many kinds of jobs. They not process the data but also can be Used for plying music, movies, and printing jobs. It finds its applications in all most all the fields. 7. Tirelessness: A computer never gate tired.

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