[dbenhur]

Wikipedia remembers: "The Scroll Lock key was meant to lock all scrolling techniques, and is a vestige of the original IBM PC keyboard. In the original design, Scroll Lock was intended to modify the behavior of the arrow keys. When the Scroll Lock mode was on, the arrow keys would scroll the contents of a text window instead of moving the cursor. In this usage, Scroll Lock is a toggling lock key like Num Lock or Caps Lock, which have a state that persists after the key is released."

https://en.wikipedia.org/wiki/Scroll_lock#Window_scrolling

[ComputerGuru]

It still works that way too in a real vtty. Hit scroll lock to scroll through the text buffer at the terminal in a text-only session with the up and down arrows on BSD. Very handy.

[mrguyorama]

My modern keyboard even still contains little arrow glyphs on the number pad keys to correspond with them.

[collinmanderson]

Isn't that for num-lock? (or when num-lock is off?)