Nope. I'm feeling a bit thick. I have looked through the code in hex editor and can't figure how it works. My original R4 died but I still have a gold, r4idsn.cn and have just received an R4-3D from r4idsn.com and still can't figure it out. avenir or jurassicplayer might have an idea or you could try a PM to ywg.Also does anyone know how to set up the extlink yet? Not to sound like a broken record, but no one seems to have said anything about that.
Off topic: I was a bit sceptical after reading build quality reports about the r4idsn.com cards. The R4 3D I have just received is very nicely made and the contacts look pristine. No contact fixes required on DSL, DSiXL or 3DS.