The CPU first generated on a computer was all about using VACUUM TUBES that was the initial phase of designing a processor that could process the needs of the programmer.
Then came the second generation computers that used the TRANSISTORS.Unlike the vacuum tubes, which requires wires, metal plates, a glass capsule, and a vacuum, the transistor is a solid-state device, made from silicon.
Beyond the third generations there is less general agreement on defining generations of computers.
With the introduction of the VERY LARGE SCALE INTEGRATION (VLSI) more than 1000 components can be placed on a single integrated circuit chip.VLSI achieved more that 10,000 components per chip, while current ultra-large-scale integration (ULSI) chip can contain more than one million components.
The main advancement of using the VLSI design was the introduction to the MICROPROCESSORS and the MICROCONTROLLERS.
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