What Movie is this ??? i dont remember?

ok what i remember of this movie it was a pretty long movie like 2 hours and a bit maybe more and it was about some kids that went to some sort of robotic world it looks like they are in a computer world and they get lost in it im pretty sure it was an 80's film deffinatly not Tron or the Explorers if anyone can guess or knows what im talking about that would be great thankyou