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1 Evolution of
Computers
Chapter Profile
History of Computers Computer Generations
Characteristics of a Computer Limitations of a Computer
Dear Students, You have learnt about computers in your previous class.
It is a familiar word for you today. But have you ever thought, “Who invented the
computer?” This machine is the result of the work of many minds. No single person
can be credited with the invention of computers, but several names stand out in
the crowd.
HISTORY OF COMPUTERS
So far, you have learnt about the various uses of the computer. You have also learnt
that the computer is a powerful device and can be used to accomplish a variety
of tasks. In the past, a great deal of research was conducted to develop a powerful
machine. In this chapter, you will learn about the scientists who were responsible
for creating the effective device you use in your everyday life.
Early Counting Tools
Since ancient times, people have invented tools for calculations. Early humans tied
knots in ropes and carved marks on clay to keep records. They also used fingers,
toes, pebbles, stones, sticks, knotted strings, and bones to count.
Early Counting Tools
Evolution of Computers 7

