Tu sembles effectivement avoir fait les bonnes manipulations:
Astérix:
The first time you run the game, the EEPROM 17B shows as BAD in the RAM/ROM Check. Hold down the Test switch F2 and then also hit F3 to reset the machine, creating the EEPROM for you.
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http://maws.mameworld.info/maws/romset/asterix
Teenage Mutant Ninja Turtles - Turtles in Time:
The first time you run the game, the EEPROM 15B shows as BAD in the RAM/ROM Check. Hold down the Test switch F2 and then also hit F3 to reset the machine, creating the EEPROM for you.
Hit F2 while the game is in attract mode. Go into 'GAME OPTIONS' and changed 'SOUND OUTPUT' from MONAURAL TO STEREO.
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http://maws.mameworld.info/maws/romset/tmnt2
Sunset Riders:
The first time you run the game, the EEPROM 15B shows as BAD in the RAM/ROM Check. Hold down the Test switch F2 and then also hit F3 to reset the machine, creating the EEPROM for you.
Hit F2 while the game is in attract mode. Go into 'GAME OPTIONS' and changed 'SOUND OUTPUT' from MONAURAL TO STEREO.
=>
http://maws.mameworld.info/maws/romset/ssriders
Sinon, utilises-tu une ROMs du set de MAME v0.136, ou antérieur? Si tu ne sais pas, retélécharge là sur Planet qui a le bon set de ROMs.
Tu peux aussi essayer d'effacer le fichier du dossier nvram correspondant au nom de ta ROM.