Ditto! We had big dumb noisy electromechanical typewriters in my Typing 9 class, and then upgraded to some kind of semi-smart typewriter for Typing 10 that had a small buffer so that you could type+correct one line but it wouldn't print until you pressed the return/enter key. They only taught us a couple weeks of word processing on computers. Microsoft Works, if I recall correctly.
Standard practice back then. I learned about it in H.S. typing class in the late 80s
Edit: s/resume/letter/g