Corrections: E9820 8002 640 width ? ; Window widthE9824 9824 9368 ? ; Window height (should not be 9824, something wrong you copy pasted)E9828 8002 640 game width ; Draw area widthE982C 9001 400 game height ; Draw area height (in vanilla draw area height is always 400 scanlines, whereas window can be 400 or 480. ; In 480 it's a letterbox mode out of performance reasons i guess, i.e. 80 scanlines less to blit).