It's normal! It's from UI... When you take a scren at the deafult configuration, you'll get the equivalent for the windows resolution. You can change it in Options>Default system options>Miscelaneous> snapshot view!
Sorry, this is not normal. I was talking about screen view on monitor, not about the snapshot view. Test the game " Atomic " (not Atomic Reloaded) and tell me your result. This image is distributed under the terms of the GPL License and use the start address $4000 which you need to load for the Quickload device.