How many generation of computer.

         
[Generation of computer]
   the development and change in technology  .
following are the main five generations along with thire inventions

         first generation of computer (vaccum tube ). (1940to1956)


         second generation of computer (transistor)(1956 to 63)

         third geeneration of computer (integrated circuite)(1964 to 71)

         fourth generation of computer (micro processors)(1969 to 1971)

         fifth generation of computer (artificail intelligence/ robot machine generation) (yet)