oh, no idea. Are you trying to run actual Neo Geo CD games rather than burned copies? Ironically, IIRC, it only works with CD-R copies rather than original games, go figure.
Personally, if they have them in the master list, I'd just download a pre-made Neo4All disc.
http://snesorama.us/board/showpost.p...19&postcount=4
(I know that is a hazy link in terms of acceptability, but Neo Geo CD owners have no easily accessible means of creating them themselves. For legal purposes, only owners of respective Neo CD games should follow the links on the forum page provided)