Screen=4:3 (640x480, 800x600, 1024x768, etc)
Screen=16:9 (800x480, 848x480, etc)

Video	Mode	Result
4:3	Full	No Change
16:9	-16:9	Set 16:9
2.35:1	-2.35:1	Set 2.35:1
16:9	+16:9	Zoom (Expand X, Y=Height)
2.35:1	+2.35:1 Zoom (Expand X, Y=Height)

Screen=16:9 (848x480)
Video	Mode	Result
16:9	Full	No Change
4:3	-4:3	Shrink X
4:3	+4:3	Zoom (Expand Y, X=Width)
2.35	-2.35	Shrink Y
2.35	+2.35	Zoom (Expand X, Y=Height)
