In computer math class we had 3 computer terminals connected by by dial-up modem to the mainframe at the board of education building 0.2 miles away. I can't remember if they shared a printer or if each one had it's own printer, but there were no monitors. After class some kids were playing a Star Trek game on the computers. I think it was like a role-playing game, and when you made a move, the printer said where you moved to. That would have been around 1977, give or take a little. I would have to look at my high school transcripts to figure it out.