You might not have the NEOGEO BIOS files. They should be zipped (neogeo.zip), and reside in one of your ROM paths (preferably where your NeoMAME sets are). If it was me, I'd use the latest MAME from mame.net as it has the most up to date NEOGEO driver (AFAIK).
> Hi, sorry I'm a noob at this forum, so first of hi 2 you all!
> I wanted to try Neomame, yeah I know it's old but it would be ideal for an old
> PC lying around.The version I got was neomamev.56 which I assumed was based on
> mame v.56, so I managed to get a clrmame .dat file for that version, and used it
> to create the roms for neomame.However, when I try running the games in Neomame,
> it says there are roms missing, have I used the wrong .dat file or something? or
> can't clrmamepro create neomame sets?
> I'd really appreciate your help with this, as it's been driving me mad.