> In general, you'll want to leave the prescale set to 0, but you can always try a > higher value to see if it helps. > > The first post here as a comparison of prescale values and their affect on the image: > http://shmups.system11.org/viewtopic.php?f=6&t=45026&start=360
I have copied and pasted settings from that page and I still get uneven scanlines. This is bbmanw: