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the evolution of microprocessors has been broadly divided into 4 generations.

first generation microprocessors-

the first generation of microprocessors were introduced in 1971-1973. they used monolithic IC and P-MOS technology. This technology has slow speed, not supported with TTL. Due to the lack of pins, signals has to be multiplexed.

Example-4004 & 4040

Second generation microprocessors-

these microprocessors were introduced in 1973-1978. they were designed using N-MOS technology. faster speed and higher density packaging than P-MOS technology. it had more powerful instruction set, ability to handle large memory space and had better interrupt handling capability.

Example-8080 & 8085

Third generation microprocessors-

these were introduced between 1978-1980. They were basically 16 bit processor and were made by using H-MOS technology. It had flexible input-output port addresses.

Example- 8 bit-8086

16 bit- 80286, 80386 & 80486.

Fourth generation microprocessor-

these were introduced after 1980. It had 2kb main memory, 16 mb physical memory, 1 tb virtual memory for enhancing speed.

Example- celeron and further invented processors.

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13y ago

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