In my case paper coding did involve the keyboard. In high school, I took a programming class at the university and they had us do our first two Fortran assignments on IBM punched cards.

I am the youngest person I know who programmed on that paper!

And paper debugging!

Fond memories of printing programs on continuous printer paper (paper with holes on the side, that many dot-matrix printers used) so that I could take my time to read them to figure out where the bugs where.