Eh, before powerpoint, there were printed overhead transparencies. Before transparencies, there were teachers who spent their entire lecture writing directly from notes to the blackboard.
I LOVED transparencies. The teacher brought it to the classroom if was not already there, and plugged it in. And there you have the presentation. Sit and wait while a humanities professor is dabbling with the computer corpse installed in the classroom and the projector that projects nearly a diamond shaped image onto a random place on the wall, until they just give up after some dozen of minutes. Or they set up edmodo and send you PPTXs instead of proper notes, and you need to watch stupid animations until you can get to see that 64th page with the paragraph you need to read, hopefully not coloured stupidly or not illegible in another way due to an incompatibility with the thing on the phone that renders those files, so that you don't have to wait until you go back home to look at the thing on the computer.
