Given values for $7B/$7D	Result
$01	1/16px per frame (every 16th frame the player appears to be moved to the right).
$08	8/16px (or 1/2) per frame (every other frame the player appears to be moved)
$10	1px per frame
$FF	-1/16px per frame (every 16 frame the player appears to be moved to the left)