Dunque.. ho provato con Metal slug 3 e l'audit mi riporta questo:
mslug3 : sp-s.sp1 131072 bytes NOT FOUND (BIOS)
CRC(c7f2fa45) SHA1(09576ff20b4d6b365e78e6a5698ea450262697cd)
mslug3 : usa_2slt.bin 131072 bytes NOT FOUND (BIOS)
CRC(e72943de) SHA1(5c6bba07d2ec8ac95776aa3511109f5e1e2e92eb)
mslug3 : sp-e.sp1 131072 bytes NOT FOUND (BIOS)
CRC(2723a5b5) SHA1(5dbff7531cf04886cde3ef022fb5ca687573dcb8)
mslug3 : asia-s3.rom 131072 bytes NOT FOUND (BIOS)
CRC(91b64be3) SHA1(720a3e20d26818632aedf2c2fd16c54f213543e1)
mslug3 : vs-bios.rom 131072 bytes NOT FOUND (BIOS)
CRC(f0e8f27d) SHA1(ecf01eda815909f1facec62abf3594eaa8d11075)
mslug3 : sp-j2.rom 131072 bytes NOT FOUND (BIOS)
CRC(acede59c) SHA1(b6f97acd282fd7e94d9426078a90f059b5e9dd91)
mslug3 : sp1.jipan.1024 131072 bytes NOT FOUND (BIOS)
CRC(9fb0abe4) SHA1(18a987ce2229df79a8cf6a84f968f0e42ce4e59d)
mslug3 : 000-lo.lo 65536 bytes NOT FOUND (BIOS)
CRC(e09e253c) SHA1(2b1c719531dac9bb503f22644e6e4236b91e7cfc)
Sto usando MAME32 0108u2. La ROM è mslug3 (76.9M). Il BIOS neogeo.zip contiene questi files: neogeo.rom, ng-sfix.rom, ng-sm1.rom. Mi pare manchi qualche file qui dentro.

Che mi suggerite?