Variable: vi-scroll-amount
vi-scroll-amount is a variable defined in vi.el.gz.
Value
12
Documentation
Default amount of lines for scrolling (used by "^D"/"^U").
Source Code
;; Defined in /usr/src/emacs/lisp/obsolete/vi.el.gz
(defvar vi-scroll-amount (/ (window-height) 2)
"Default amount of lines for scrolling (used by \"^D\"/\"^U\").")