Racer,
What operating system are you running, DOS, ME, Win2k, and how are you trying to launch them command line, or Front End, and if Front end, which one? Are you using the standard directory structure for ADVMAME, or are you trying to point to different directories? As for your Rage128 in an Arcade Monitor, what HZ frequency does your monitor run 15, 25, or 31? Can you describe the problem further?
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Dave