Emacs Init: Arrow Key for Screen Line or Logical Line

Up/down arrow key move by visual line or logical line

New in Emacs 23 (Released 2009-07)

By default, arrow up/down moves by visual line.

;; up/down arrow move based on logical lines (newline char) or visual line
(setq line-move-visual nil)
;; default is t

Arrow Up/Down Scrolls Screen

Alt+x scroll-lock-mode. When on, up/down arrow keys scroll the page, instead of moving the cursor.

This only turns it on in current buffer. There is no global setting.