Anyone happen to know what the abbreviations after a ROM's file name stand for? ie: Castlevania (U) [p1].nes, Castlevania (U) [o1].nes, etc.
I know the letter represents the country in which the game is from: U = US J = Japan, E = Europe, etc. but the p1, o1, a1, and all that is Greek to me... I'm thinking it might be a revision number or something along those lines... anyone know for sure? Thanks.