Hello Eric, yes of course I think you can use mame2003 as neogo.core, with the right name of course for mame2003 For the neo geo roms selection well there is no simple answer I think, I would simply advise you to do it manually, there are not that many neogeo games I would say 50 or so, at most 100. You can help yourself with a recent MameUI version on a PC wich would allow you, without any set, to display neogeo roms from menu options (based on internal DAT) Other than that, yes it would require .Dat or clrmamepro or both