If you want to get technical, it was in the 1940s. it was the size of a small house. see http://en.wikipedia.org/wiki/ENIAC if you are thinking computers roughly the size you see them today, the answer could be argued between the 70s 80s and 90s. in the 70s you had the Xerox Alto, in the 80s you have the Macintosh and the IBM PS/2, 90s is when you start seeing more modern things though.
The Computer Modern was invented 1958 USA
In USA
The first computer was invented in 1946
William danck in 1979
Douglas Englebart is the inventor of the computer mouse. He invented the first prototype in the 1960s with the assistance of Bill English.
Before modern computers were invented word "computer" meant "somebody who computes".
Raoul Wallenberg
kanord zuse invented hthe first computer you ever used.
Charles BABBAGE invented a prototype of the modern computer.
the father of the modern computer was charles babbage , who invented the "analytical machine"
Alan Turing invented the idea of the modern computer in 1936. This device became known as a 'Turing Machine.' It was a hypothetical device that could help scientists comprehend the limitations of a computer's ability to perform calculations.
Charles Babbage developed 1st computer in 1886.