Actor John Wood provided the voice for Joshua/WOPR. This is made apparent towards the end of the movie when Falken is talking to Jennifer and David, after he plays the dinosaur movie. Although the computer voice is enhanced mechanically, the inflection of Wood's voice and the computer are spot on.
WarGames
High School student David Lightman has a talent for hacking. But while trying to hack into a computer system to play unreleased video games, he unwittingly taps into the Defense Department's war computer and initiates a confrontation of global proportions. Together with his girlfriend and a wizardly computer genius, David must race against time to outwit his opponent and prevent a nuclear Armageddon.
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