Teletypes are the original use of "Carriage Return" and "Line Feed". Manual typewriters had an arm that did both as you dragged it. IBM 3270 terminals were sc

Teletypes are the original use of "Carriage Return" and "Line Feed". Manual typewriters had an arm that did both as you dragged it. IBM 3270 terminals were screen/form based, not line based. So the "Enter" key was "Submit this screen/form". "Return" was "I'm typing in a multiline text element and I want to go to the next line". They also had separate "forward/back" to move between input areas of the screen, which was not "tab/backtab".