I set the Atari 5200 to be loaded into the Mess64 (0.177) and it worked fine. For Atari 7800, the emulator opens, but the cartridge doesn't load:
"Fatal error: Device Atari 7800 Cartridge Slot load failed: Unspecified error"
My ROMs are "No-Intro". Searching on internet, I found it:
http://mametesters.org/view.php?id=6165&nbn=4
What is the correct setting for Atari 7800?
Thanks!