Reduction in size of computers

Original computers were big, really big. It was usual to have a computer that took of several computer racks. One of the largest computers was ENIAC computer, that used 1800 sq.ft. of floor space. Size of the computer did not result in its performance, they were slow. Original computers were using vacuum tubes. Vacuum tubes are very similar to a bulb. Vacuum tubes got replaced by transistors, which allowed to reduce size of computers.

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