system I question

I assume you mean the YM2151, the Pokey and the speech chip? If so, Road Runner also uses all 3. I don't think Marble Madness and Peter Packrat use the speech chip (since there's no speech in either game), and I don't have the ROMs handy for Road Blasters to check it in MAME.
 
Yes, those three chips... :)

I knew that MM did not use it. Was not sure about PPR and Road Runner (although mine do have them). I have a couple of RB that have them and one that does not...
 
I have a RoadBlasters, and it definately has speech in it, but I'm not familiar with how it works or anything. It talks the entire game, I think at the beginning of each level.
 
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