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Vacuum Tubes
The first computer ever made had vacuum tubes -
E.N.I.A.C.
E.N.I.A.C. was be the acronim of Electronic Numerical Integrator And Computer, E.N.I.A.C. there was be considerated the first digital computer of the history. -
Transistors
The second generation of computers haven't got Vacuum Tubes cause the transistors are more smaller and cheaper. -
Integrated circuits
The third generation have integrated circuits that are faster and cheaper.