It's known that there are data processing gremlins somewhere in our ARM7 core because there are definite CPU-related cockups in some Game Boy Advance games in MESS (in several games it takes the form of the software-mixed sound channels being distorted, and a few actually crash). It's just been a matter of finding simple test cases.
And in other games - in fact, most of them - it manifests itself in horrifically corrupted tile graphics.
