The history of computers is divided into 5 generations:
First generation (1951. – 1959.):
The first computers were constructed for scientific purposes only. In 1951 computers have started to be used in commercial use too. The basic element of this generations computers is the electron tube. The computers dimensions where big, their speed slow and they were undependable. The first general-purpose electronic computer was ENIAC (Electronic Numerical Integrator And Calculator). It’s weight was over 30 tons, it consisted of 18.000 electron tubes, 70.000 resistors, 10.000 capacitors and 1.500 relays. It consumed roughly 174 kWh of electric power and his speed was about 300 calculations per second and had a volume of 100m^3. It’s existence was published on the 16.02.1946 and that date is considered the start of the computer revolution.
Another computer from that generation was the UNIVAC (Universal Automatic Computer) Computer System. It was the first commercial computer which processed text and numbers. It was build by J. Presper Eckert and John Mauchly. Those two started the Eckert-Mauchly Computer Corporation back in 1946. These two experts worked earlier on ENIAC and EDVAC together. Their mathematical consult was John von Neuman who created the logical computer structure with input output devices, memory and a central processing unit.
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