i also have a s3 prosavage ddr, chipset in my laptop. Chankast runs the bios beautifully at around 50/60fps, but as soon as it tries to run an 'iso whether a physical disc or an emulated drive(daemon tools or alcohol120) then it runs the dreamcast logo intro and then crashes. Personally I think it might be a bug in the cdrom.dll ? Could that be a feasible answer to the problem ?