It might also be worth noting that the SNES used non-square pixels. CRTs didn't really have a discrete horizontal resolution, so they could stretch the 8:7 imag

It might also be worth noting that the SNES used non-square pixels. CRTs didn't really have a discrete horizontal resolution, so they could stretch the 8:7 image about 17% horizontally to 4:3. In other words, each pixel had a 7:6 aspect ratio. On an LCD, it's difficult to do this and still get all the pixels in the grid without any blurring or wobble. Even if you choose the vertical resolution as an exact multiple of 224, the horizontal resolution often won't be quite right. I believe 896x672 is the smallest resolution that will work exactly (for displaying 256x224 with 7:6 pixels).