Okay so I've just purchased a Pi3 to start a classic arcade project, i have zero experience so i'm spending a couple days watching videos and reading forums to get my head round things.

I think i'm happy with the standard games consoles - SNES, Megadrive etc.

So the problem is MAME, iv'e read so many post and my mind is more blown.

If i download a rom thats 0.164 for example i can see with Retropie none of the emulators support it closest being 0.139 , so is this where Clrmamepro comes in from what i understand i can then change the romset to .139 so i can use it with lr-Mame2010 , is this all correct if thats the case so i just download a complete romset like 0.138 change them all to .139. Or shall i just download a the 0.139 update pack and im good to go.

Thanks in advance