ENIAC

The first large-scale electronic computer,the grandparent of today’s handheld
machines, was the Electronic Numerical Integrator and Computer or ENIAC,whic become operational in 1946. ENIAC contained approximately 18000 light-bulb-size electronic vacuum tubes that controlled the flow of electric current.It weighed 30 tons and occupies about 1800 square feet of floor space ,a huge machine by today-s standard. It was able to moltiply four numbers in the then-remarkable time of 9 milliseconds(that is 9/1000 of a second). From that start, computers have developed through four so called generations, or stages, each one characterized by smaller size, more power, and less expense than is predecessor.

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