So all of my roms are in individual zip files but as you mentioned only certain roms are compatible with certain versions of MAME thus needing a full set for that version. For those that have a full arcade how many different versions of MAME are you using on your Launch box to get the majority of these titles working? I see there are programs on the net that do organize and remove duplicates, clones, and will organize by version. That seems like the easy way to go rather then redownloading 60gb of full rom sets when I already have them all in a single folder. I just downloaded the newest mame version 126. There has to be an easier way to accomplish this. I have all my other emulators and roms setup but mame has to be the challenge and the most important piece of the puzzle for my home build. This would also mean that I would need to set individual controls for each version of MAME which isn't too difficult but just a PITA.