You’d be wrong to think that computer games were invented in the 1970s. Games were being developed more than 60 YEARS ago by trail-blazing researchers. Fun titles included Tennis For Two Granted, it might not look like much – one horizontal line with a small vertical line and what looks a bit like a smudge on the screen. But they represent the tennis court, net and ball flying between two players who served and volleyed using controllers with buttons and rotating dials. The…