If you're talking about the release by Cal2 of Virtual Jaguar WIP that you downloaded from Potato Emulation, then you're asking in the wrong place. We develop an emulator called Virtual Jaguar GCC/SDL Portable Jaguar Emulator whose homepage is found at
http://icculus.org/virtualjaguar. If you have questions about that emulator that are
not answered in the README, WHATSNEW or TODO files, feel free to post them here.