There were IBM logos designed for the film, and there were IBM design consultants working with Kubrick on the layout of the controls and computer screens. ↗
Actors will never be replaced. The thought that somehow a computer version of a character is going to be something people prefer to look at is a ludicrous idea. ↗
At the risk of being a fuddy-duddy I don't have a computer; I don't have e-mail; and I really don't need something in my house that I would be sitting in front of for hours. ↗
It was used for decades to describe talented computer enthusiasts, people whose skill at using computers to solve technical problems and puzzles was - and is - respected and admired by others possessing similar technical skills. ↗