Mainframe computers
—Used in big industries.
—Have a lot of memory and storage space.
—Can facilitate more than 150 users.
—Have price in tens of million dollars.
Mini computers
—Not actually mini.
—But smaller than mainframes in size, speed , storage and price.
—They can also serve many uses at a time.
—Used in small business organizations and institutes.
—Can facilitate 30 – 40 users at a time
Micro computers
—Also called personal computers.
—Most popular.
—Examples are laptops , desktop computers, mobile phones. I Pads etc.
Today computers:-
Generations of Computer:
—1st Generation(1945-1950)
—Made up of vacuum tube.
—ENIAC, MARK 1 MARK II
—Very slow expensive and
large
2nd Generation:
(1950-1959)
—Made up of
Transistors instead of vacuum tube.
—Small and less
expensive as compared to 1st generation.
—E.g. EDVAC and IBM
1401
3rd
Generation:
(1960-1969)
—Made up of ICs.
(integrated circuit)
—IC is a small chip
having hundred of transistors on it.
—High in speed.
—Low in price.
4th
Generation Computers:
(1970-1980)
—Large scale
integration.
—Thousands of
transistors on single chip.
—Also called micro
processor
—Example is
—IBM PC
Fifth Generation Computers:
(1980 on wards)
—Computers that can
think and work like human.
—Computers having
intelligence called AI.
—E.g. robots used in
large industries.
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