When I was in high school in the early 70s, we had a terminal (teletype) connect to a HP3000F through a 110 baud, acoustic coupled, modem.
It ran HP time-shared BASIC. There was 4 or 5 of us that figured out how to make it work. In '74 they offered a "Computer Science" class.
In the 1st 6 weeks of the class we had 5 teachers and none of them new squat about a computer. We had to teach them how to work the terminal.
Easy A though. ;-)
Of course we had to walk 10 miles to school, in the snow, up hill, both ways.........