Yes indeed. Guessing that back in the day, most people programmed their Spectrums using TVs so they would never know/care about the extremes of the border. I guess I'm just trying to work out if this Qarx artifact thing is due to a bug in something I've done, or is it due to Mame exposing border areas that typically weren't visible back in the day. After all my border tests and comparisons I've pretty much convinced myself that its the latter so that's cool smile