[Request] Add 320x240 Resolution to Dreamcast Cores

Quick question (these are still working great) but why is it that when I use the normal scalefx x9 shader for something like kof 99 on dreamcast, if the dreamcast core is 640x480, it’s still all pixelated. But when I force the rez to 640x480 with this shader with scalefx x9, it looks soooo much better?