What is a computer:-
Latin word “comutare” means calculation.
Electronic device
Can process data
Or
A system of
interrelated components that perform the basic function of
History of computers:-
Abacus in 1500 by
Chinese
Difference Engine by Charles Babbage in 1812
can calculate power of numbers
Electronic numeric integrator and computer (ENIAC) by Mauchly and
Eckert(1946)
EDVAC (1950) by Von Numan
First non scientific
computer.
Could be used for
business.
Could store data.
But could not solve
all the problems of that time.
Types of computers
DIGITAL COMPUTERS
Perform work on fix numbers. very accurate and high in speed
ANALOG COMPUTERS
They process information that is continues.
Used to measure natural quantities like temperature, pressure, speed etc.
HYBRID COMPUTERS
Have good qualities of both digital (accuracy) and analog (speed) used in radars, petrol pumps, and medical equipments.
Classification of computers
Mainframe computers
Mini computers
Micro computers
Super computers
Super computer
Also called number crunchers
V.v. high in speed and accuracy
Not for public use
Used in scientific research and very special places like atomic reactors and NASA

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