MAME style ROM format works fine. Here the example from the commercial XenoCrisis
BB01-c1.c1
BB01-c2.c2
BB01-m1.m1
BB01-p1.p1
BB01-p2.p2
BB01-s1.s1
BB01-v1v1
neogeo.xml
Or here from MetalSlug2
241-c1.c1
241-c2.c2
241-c3.c3
241-c4.C4
241-m1.m1
241-p1.p1
241-p2.sp2
241-s1.s1
241-v1.v1
241-v2.v2
Or here from Homebrew WorldRacer
wridracr.c1
wrldracr.c2
wridracr.m1
wrldracr.p1
wridracr.s1
wridracr.v1
And here what the Backbit Forum say:
What games are supported?
All original Neo Geo MVS/AES games are supported. Neo Geo CD games are not supported.
Most homebrews are supported, as long as they don't go over MAX 840 MEGA (512 CROM, 128 VAROM, 128 VBROM, 64 PROM, 4 SROM, 4 MROM). Titles that have security keys locking them to specific hardware will not be supported. All known banking schemes are supported, and more could be added if needed.
