I'm having the strangest issue with my everdrive. I'm using it on a US TurboDuo and most if not all the Japanese games play fine, but most of the US games won't boot. Some do like Legendary Axe II and Klax, but the bulk do not. Is there just a bunch of bad US roms floating around out there or could it be something like a region problem?
I don't think that it is a region problem as my US Duo and my SuperGrafx both play all of the same roms (US and JAP) without issue as long as the PCE/TG16 switch is set for the correct console's region. Do they work on an emulator?