History Of Computer, Types Of Computers And who invented it

1. Done
by
Pranav Krishna

2. Content:
 Calculating devices
 Electro-mechanical computers
 Electronic computers

3. Pre-Mechanical Computing:
From Counting on fingers
to pebbles
to hash marks on walls
to hash marks on bone
to hash marks in sand

4. Mechanical computers:
The Abacus (c. 3000 BCE)

5. Napier’s Bones and
Logarithms (1617)
Picture courtesy IBM

6.  Pascaline (1645)
 Stepped Reckoner (1674)
 Jacquards loom
 Difference Engine
 Analytical Engine

7. Blaise Pascal’s
Pascaline (1645)

8. Gottfried Wilhelm von Leibnitz’s
Stepped Reckoner (1674)

9. Joseph-Marie Jacquard and his punched card
controlled looms (1804)

10. Preparing the cards with the pattern
for the cloth to be woven

11. Charles Babbage (1791-1871)
The Father of Computers

12. Charles Babbage’s Difference Engine

13. Charles Babbage’s Analytical Engine

14. Electro-mechanical computers
From
Herman Hollerith’s
1890
Census Counting Machine
to
Howard Aiken
and the Harvard Mark I (1944)

15. Herman Hollerith and his
Census Tabulating Machine (1884)

16. A closer look at the Census Tabulating
Machine

17. The Harvard Mark I (1944)
aka IBM’s Automatic Sequence Controlled
Calculator (ASCC)

18. Electronic computers:
 Generation 1 ( the first digital computer)
 Generation 2
 Generation 3
 Generation 4
 Generation 5

19. Generation 1
 This is when the first digital computer was built
 It was started to be built in 1937 and finished in 1939
 John Vincent Atanasoff, and Cliford Berry
 At Iowa State University
 This machine was not intended as general-purpose computer,
it was built to solve physics equations that Atanasoff was
working on at the time
 using electronic vacuum tubes, as the switching components

20. Generation 2
 This invention of the transistor which was faster, smaller and
required considerably less power to operate
 This was introduced in 1959

21. Generation 3
 By the late 1960’s devices which included more than one circuit on
a single silicon chip became available

22. Generation 4
 In about 1970 the technology was available to place an entire
CPU on a single chip and the micro processor was born.