can't get roms to work on macmame

For some reason whenever I try to run cps-2 games, like marvel super heroes or eco fighters, on my MacMame v1.03 an error box comes up saying files are missing. Do I need Bios for these roms? I've tried downloading them from different sites and they still won't work. Can anybody tell me whats wrong?

Try these:
http://www.romnation.net/srv/roms/56...ro-951024.html
http://www.romnation.net/srv/roms/55...ld-931203.html

Thanks, those work! I wonder why the others didn't...

edit--
Actually I take it baack. The Marvel Super Heroes one still doesn't work.

Try this one then:
http://www.coolrom.com/roms/mame/118..._951024%29.php

sigh...still doesn't work. Maybe I have a bad emulator or something. A lot of arcade roms don't work for me for some reason.