So, kgen98 was one of the first genesis emulators, and it runs on dos.
I use it in one of my ICT classes (paired with a sonic 1 rom) on a floppy disk to demonstrate just how heavily compressed and optimised older games were.
It's an oddball that is definitely worth trying out.
Very interesting, I'm surprised it works as well as it does. I also have nostalgia for emulation - namely using no$gb (no cash gameboy) via DOS (I think) to play Pokemon Red and Blue.