"When I started, proper data input/coding used optical recognition cards (punched cards were expensive) - These looked like punched cards but you filled boxes in with a soft pencil."
I used those to, in high school, using APL. Sent off to the local government computer centre. I got cocky, bought a Rotring ink pen of suitable size, specifically for marking those cards. If you're gonna use a write only language, then you don't make the sort of mistakes where you have to write it again, coz then you gotta be able to read it.