Virtua Racing uses the SVP chip. Later versions of PicoDrive have perfect ARM optimised support for it but the source-code is not yet released. I'm beta tester for the latest GP2x/Wiz PicoDrive version which introduces 32x support and an ARM dynarec for the 2 RISC CPUs . 32x works great already on the Wiz so the chances are very high that the N900 will handle it too. Some more features that are in the pipeline are Master System and lightgun support over touchscreen. Notaz, the coder behind PicoDrive stated, that he wants to release the source once he finished it. So javicq may add this features in the future for the N900 if he wants and have time to do it... Here's a video of Chaotix running on the Wiz: http://www.youtube.com/watch?v=z0_fqrz7jD0