The overall premise was a little over the top, but WarGames (the older one) got some of the detail correct. In 1983, no less, so it's replete with dial-up sounds and everything!
WarGames was a marvelous movie! With the exception of WOPR, all of the computer usage was fairly accurate, with a few fudges such as that speech module being audible everywhere, when it clearly says that he bought it for his home computer to read terminal output. Everywhere else a computer is shown being used, it's fairly mundane, e.g., a librarian doing searches for books on Falken. There's no "computers are magic" crap-ola that goes on in later hacker-themed films.
As for WOPR, he is based on a real cold-war program called SIOP (Single Integrated Operational Plan), under which the President could tentatively select nuke targets and run computer simulations of what might happen. WOPR, unlike a lot of movie AIs, is not even particularly malicious; he is just running what he thinks is a simulation, blissfully unaware of the stakes, as any computer program without sufficient "common sense" would be.
Probably the biggest exaggeration in that movie was the shots of the NORAD command center, which NORAD officials at the time stated was what they wished they had rather than what they actually had. The filmmakers were not permitted access to the insides of NORAD so again, they had to make shit up.
As for WOPR, he is based on a real cold-war program called SIOP (Single Integrated Operational Plan), under which the President could tentatively select nuke targets and run computer simulations of what might happen. WOPR, unlike a lot of movie AIs, is not even particularly malicious; he is just running what he thinks is a simulation, blissfully unaware of the stakes, as any computer program without sufficient "common sense" would be.
Probably the biggest exaggeration in that movie was the shots of the NORAD command center, which NORAD officials at the time stated was what they wished they had rather than what they actually had. The filmmakers were not permitted access to the insides of NORAD so again, they had to make shit up.