Atari 8-bit emulator (400/800/1200/XL/XE/5200 etc.) that has excellent compatibility with all the best 8-bit games, including the supercartridge games like Bounty Bob. I'd suggest app-emulation/atari800
Created attachment 244 [details] atari800-1.2.2 ebuild plus patch, man page, and config file $ tar tfz atari800-ebuild.tar.gz atari800/ atari800/files/ atari800/files/digest-atari800-1.2.2 atari800/files/atari800-1.2.2-gentoo.diff atari800/files/1.2.2/ atari800/files/1.2.2/atari800.cfg atari800/files/1.2.2/atari800.1 atari800/ChangeLog atari800/atari800-1.2.2.ebuild
I should have noted somewhere in the docs that the only ROMs included on atari800.sourceforge.net are for the Atari 400/800 (Version B) and the XL series. 5200 ROMs are not available there, and so are not installed with this ebuild.
My appologies for this taking so long... it is checked in with a little bit of updating... Thank you for your contribution :)