In 1982 it didn't look like much of anything bc by then no one in the general public had ever sat in front of a computer. My jr. high yearbook and even my high school one in 1987 was laid out by hand and involved no computers at all. But to answer your question, ALL screens were green phosphor, no graphics whatsoever, and they had the screen built into the rest of the box, like a very primitive iMac. Up until then nerds were social outcasts but as the rise of the machines took place, suddenly they were the people who knew ow to operate these new things that were running our lives, and frankly they were suddenly to be feared since no one knew just what computers could and would do yet these geeks were in charge of them. Society went from making fun of nerds to kissing their asses. It pretty much remains the same today. Oh, and almost no computers were ever connected to others back then. That was EXTREMELY rare.

I remember seeing an article on how Tron was produced in some magazine and it showed two guys sitting in front of a computer with a crude wire frame of a recognizer on it, and the text said they were sending data to others working on the movie through a special device. That special device was one of those modems that you had to actually set the phone receiver on, sitting right next to the computer.