http://en.wikipedia.org/wiki/Colossus:_The_Forbin_Project
Colossus: The Forbin Project is a 1970 American science fiction thriller film. It is based upon the 1966 novel Colossus, by Dennis Feltham Jones, about a massive American defense computer, named Colossus, becoming sentient and deciding to assume control of the world.[1]
Great old Sci-Fi movie. Heard there was a part two, but never did find any details on it.