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#EVOLUTION OF COMPUTERS
EARLY COUNTING TOOLS
Since ancient times, people have invented tools for calculations. Early man tied knots in
a rope and carved marks on clay to keep the records. They also used to count with the
help of fingers, toes, pebbles, stones, sticks, bones, etc.
ABACUS—FIRST CALCULATING DEVICE
The first step towards computing was the invention of Abacus
around 3000 years ago, in China. It is a wooden frame with beads
on parallel wires which can do simple calculations like addition and
subtraction.
Abacus
PASCAL'S CALCULATOR
In 1642, a mathematician, Blaise Pascal
invented the calculating machine called the
Pascal's Calculator. This device is believed
to be the first mechanical calculator of
the world. This machine was capable of
performing only addition and subtraction. Pascaline Blaise Pascal
CHARLES BABBAGE’S ANALYTICAL ENGINE
In 1822, Charles Babbage, a mathematician, developed a
steam-driven calculating machine, which was the size of a room,
which he called the Difference Engine. But even after working on
this project for 10 years, this machine never became a reality.
In 1833, he invented a machine called the Analytical Engine,
the first-ever working model of a mechanical computer, a fully
program controlled machine. Charles Babbage
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