Madhumitha

Transistor was invented in 1948 (23 December 1947 in Bell lab). IC was invented in 1958 (Fair Child Semiconductors) By Texas Instruments J kilby. First microprocessor was invented by INTEL(INTegrated ELectronics).  Size of microprocessor –  4 bit  Name Year of Invention Clock speed Number of transistors Inst. per sec INTEL 4004/4040 1971 by Ted Hoff and Stanley Mazor 740 KHz 2300 60,000 Size of microprocessor –  8 bit    Name Year of Invention Clock speed Number of transistors Inst. per sec 8008 1972 500 KHz 3500 50,000 8080 1974 2 MHz 6000 10 times faster than 8008 8085 1976 (16 bit address bus) 3 MHz 6500 769230 Size of microprocessor –  16 bit  Name Year of Invention Clock speed Number of transistors Inst. per sec 8086 1978 (multiply and divide instruction, 16 bit data bus and 20 bit address bus) 4.77 MHz, 8 MHz, 10 MHz 29000 2.5 Million 8088 1979 (cheaper version of 8086 and 8 bit external bus)     2.5 Million 80186/80188 1982 (80188...

     The Micro controller was developed by Intel in 1980. The 8051 is one of the most popular 8 bit micro controllers and combines an instruction set that allows tight coding of small particularly I/O application with enough power and a large enough program space that it can be used with C Language.     The last decade has seen an exciting evolution with capabilities of microprocessors. The development of 16 and 32 bit microprocessors contributed  to the growth of powerful personal computers that are used in all walks of life. Because of their processing power and speed, these 16 and 32 bit microprocessors have also found their way into the design of standalone products such as electronic instruments which require sophisticated control capability. In the evolution of microprocessor capability, instead of focusing upon larger word widths and address spaces. the present emphasis 'is upon exceedingly fast real time control. The development of microcontrollers...