The extra space provided by large
screen devices can be used to display additional buttons. If
displayed in normal portrait mode (not in the 'big button' mode) then
ALL buttons will be displayed on screen at once. Consequently,
the 'Up' button will not cause any button scrolling to take place.
In landscape mode, not all buttons can be displayed at once,
so the 'Up' button will cause scrolling on the right side of the
screen. Note that, by default, some
buttons may be repeated, such as the x^2 and 1/x buttons. These
are just the default button assignments, and they can be assigned to
something else if you so choose.
The images below show the standard screen size, on the left, and an extended
screen in portrait mode on the right. Note that the extended display shows
ALL trigonometry, financial, statistics and programming buttons.