MAME problem with Black Tiger

[Hateshinai]

Recently I have been having some problems with MAME. Certain ROMs are not recognized (Willow, Black Tiger, Solar Warrior). They all appear to have missing files even though I downloaded each a couple of times from different sites. I tried the parent ROMs and the clones/variations of these games. What is going on? Am I missing a BIOS or something?

[Hatta]

They probably depend files in another rom. As far as I know there's no easy way to tell which rom you have to get to satisfy the dependency. I recommend just downloading a full set, matched with your version of MAME of course. Google "Pleasuredome" for a torrent site that hosts the full set ratio free.

[Hateshinai]

Googling "Pleasuredome" seems a bit risky...