I will look into it for you shortly just changing a nappy.. EDIT: 2 hours later BOY THAT WAS ONE BIG NAPPY .lol Ok tried metal slug and metal slug 4 both worked fine metal slug - 55% speed a little jerky metal slug 4 - 55 - 61% speed again a little jerky. To get them to work:- Unzip a metal slug rom and unzip neogeo bios into the same place then make one new zip file with both sets of unzipped files in and make sure you name the new zip the same name as the original game zip file.