I have dusted off my 4-year old MIST, upgraded its firmware and cores and everything is working as good (or better!) than before, except for my atari800 core. It boots to a black screen, and if I press F12, some thick vertical bars (and blocks at the top) show up - it looks like a rudimentary diagnostic, but it's stuck. I've checked my roms folder, messed around with other things, and don't get a working 800. Is the latest MIST firmware incompatible with this core, or is there something else I should look out for?
thanks!
dylan