Sorry to sound like a newbie. I've had these for months, but setup my MAME & Pinball and just never looked at them before!! (It's hard to play thousands of MAME games, but I'm up to the challenge!)
In my NES_SNES3 romset. I have subfolders for GoodSNES [2.04] and GoodSPC [2.01] also within a subset of the NES folder I also have Famicon Disk System, GoodNES [2.01], and TOSEC.
In my SEGA set, I have GoodGEN [2.05], GoodGG [2.01], and GoodSMS [2.01].
What are these designations? Where can I get an explantion of these folders and what emus to use for them?