That emulator looks ancient and abandoned, he should try SSF. Apparently it's the most accurate Saturn emulator out there. It also works with the real Saturn disks if you put them in your computer.
You will need your own copy of the Saturn BIOS though.
This link goes to a listing of all of their releases, the latest one is at the bottom. It goes to a Japanese page so the title of it may look wierd depending on your browser.
‰ß‹Ž‚Ì.§.ì‹L˜^
Note that I have never used this emulator.