What is Microprocessor? Explain it's History.

What is Microprocessor? Explain it's History.
Microprocessor is a program controlled device which fetches the instruction from memory, decodes it and executes the instructions. It is a multipurpose, programmable, clock driven register based electronic device, that reads binary instructions from storage, accept binary data and provide result as output.

There is great contribution of INTEL corporation for the development of microprocessors. It developed various series of microprocessors as :-

• Intel 4004 :- It is introduced in 1971. It is 4 bit, consist of 16 pins with  clock signal of 7050 Hz
• Intel 8008 :- It is introduced  in 1972 and is 8 bit. It consists of 40 pins.
• Intel 8080 :- It is introduced in 1973 and id of 8 bit. It is 10 times faster than 8008.
• Intel 8085 :- It was firstly released on 1976. It  was updated version of 8080 and it is also  of 8 bit. It consist of addressing capacity of 64 KB. It have 40 pins.
• Intel 8086 :-  Introduced in 1978 and is of 6 bit. Addressing capacity is of 1 MB. It also have 40 pins. It consists of 5-0 MHz clock signal.
• Intel 8088 :- Introduced in 1980. It is of both 8/16  bit. Addressing memory  is of 1 MB and have 5.8 MHz of clock signal.
• Intel 80286 :- Introduced in 1992 and is of 16 bit.  Addressing memory capability is up to 16MB. It have 68 pins. 6-12.8 MHz clock signal.
• Intel 80386 :- It was firstly developed on 1985 and is of 32 bit. It have capability of 4 GB addressing. It consists of 132 pins with 26-100MH clock signal.
• Intel 80486 :- It was developed on 1989 and is of 32 bit with 4 GB addressing capacity memory. Consists 168 pins with 26-100 MHz clock signal.
• Pentium processors (80586) :- It is introduced in 1993 with 32 bit and 4 GB memory addressing capability. It consists of with 100 and 150 MHz.

 Pentium pro, Pentium II, Pentium III, was developed each with 32 bit word length having 150-1000 MHz clock signal.