http://gpsp-dev.blogspot.com/
I haven't quit gpSP, just put it on hiatus for a while.
Games like Super Mario Advance 3, Riviera and Sword of Mana actually DO work in gpSP, believe it or not. If they don't work for you then you're using the faulty BIOS. Don't argue with me, it's true; the sooner you accept this the sooner you can move on.