Fundamental of Computers - History of Computers

1. SHRI BALAJI
INFOTECH
DCA (English)
SHRI BALAJI
INFOTECH
2. History of Computers

2. History of
Computers • During the 20th century, at the initial stage calculations
were done by mechanical computing devices.
• "Abacus" was the first mechanical computing device
introduced by the Chinese.
• It is a manual calculating device used for addition and
subtraction.
1. Abacus
Abacus

3. History of
Computers • Napier's bones were the next device for
multiplication by an English mathematician, John
Napier in the 16th century.
• It performs operations like multiplication, division,
extracting square roots and diagonal modification.
2. Napier's bones
Napier's bones

4. History of
Computers
• Slide Rule was developed by an English
mathematician, Edmund Gunter in the 16th century.
• It could perform operations like addition, subtraction,
multiplication and division.
3. Slide Rule
Slide Rule

5. History of
Computers • Blaise Pascal World's famous scientist, the world's
atomic number instruments have been built
• It had eight rotating wheel-like boxes, called dials.
• These dials were used to perform simple numerical
calculations.
4. Pascaline
Pascaline

6. History of
Computers • In 1673, Leibniz's multiplication and dividing
machine were introduced which could do both
multiplication and division.
5. Leibniz's multiplication and
dividing machine
Leibniz's multiplication
and dividing machine

7. History of
Computers • Punch card system was developed in 1801 by
Jacquard.
6. Punch card system
Punch card system

8. History of
Computers
• A difference engine is an automatic mechanical
calculator designed to tabulate polynomial functions.
• It was designed in the 1820s, and was first created
by Charles Babbage.
7. Difference Engine
Difference Engine

9. History of
Computers • Then "Analytical machine" was developed by
Charles Babbage that was intended to be
completely automatic.
8. Analytical machine
Analytical machine

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SHRI BALAJI
INFOTECH