Computers games can have no video at all why the 'display' it's being sent over a serial output to either a display or a printed paper.

Nethack/Slashem, text adventures, Sokoban, Trek... can be printed one sheet at a time and be totally playable. With Slashem it might be a big waste of paper, but with text adventures you can just reuse the output (obviously) and reduce tons of further typing because you already have the whole scrollback printed back in your hands.