Seeing the AW->DC porting work over at the dreamcast-talk forums, I was curious to see how it would work trying to go the other direction. Since Atomiswave never had any shooters I started with Ikaruga. Long story, short--it works great and Ikaruga is completely playable.
I used Sport Shooting USA as the base rom to make it drop-in playable on the aje_fr multi.
I used Sport Shooting USA as the base rom to make it drop-in playable on the aje_fr multi.