I thought it was actually paper coding, as many of us learned to do before coding right away into a keyboard.

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.

I've always dreamed of doing that.

Whenever I proofread papers in college, I would always print them out. There's something about being able to physically hold the paper that makes keeping the whole idea in your head easier that just isn't possible on a screen, for me at least.