You can learn more about computer generations

1. Computer History Timeline
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2. The Computer-Key Developments
• Abacus-calculating device(3000BC)

3. Abacus-
• Is an ancient calculating device.
• First man made computing device.
• Is still being used in China, Russia and the
Far-east countries for calculations.

4. Pascaline-mechanical adding
machine(1642)

5. Pascaline-
• is a desktop mechanical adding machine.
• This was developed by Blaise Pascal.

6. Punched cards-data
storage(1800s)

7. Punched cards-
• A card punched with holes in certain
places that a computer can read data
coded from the combination of holes.
• This was first used by Joseph Jacquard to
automate his weaving factory.

8. Babbage-Analytical engine(1830s)
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9. Analytical Engine-
• This was invented by Charles Babbage
who is known as “the father of computers”.
• Designed to store one thousand 50 digit
numbers for calculations and decisions.

10. Hollerith -
Tabulating machine(1890s)

11. Tabulating machine-
• This was invented by Herman Hollerith to
tabulate1890 US census (Poll) data.
• It was electrically powered and, used
punched cards.
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12. Mark i-General purpose
computer(1944)

13. Mark i-
• This was invented in 1944 by Dr.Howard
Aiken.
• The idea is based on programmable,
general purpose computer.

14. ENIAC-Electronic computer(1946)

15. ENIAC-
• In 1946 John Mauchly and J.Presper
Eckert introduced the ENIAC as an
electronic computing machine.

16. UNIVAC-
US Census Department(1951)

17. UNIVAC-(UNIVAC-i)
• It was developed and this is the first
commercial computer which got large
amount of public attention.
UNIVAC
Programming
Team

18. EDVAC
(Electronic Discrete Variable Automatic Computer)
Stored Program Concept(1951)

19. IBM-701(1953)

20. Apple II-
First personnel computer(1977)

21. IBM-PC (1981)

22. Portable computers(1987)

23. Multimedia Desktop Computers
(199……)
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24. Thank You !
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