Today I tried to plug my Sega Mega Drive original gamepad to my Nvidia Shield K1 tablet through the Mayflash adapter, and I was surprised the pad almost worked. “Almost” because C button didn’t work, and up, down and left seemed to have issues (you can’t press down and left at the same time for instance, which is bad for fighting games).
I tried messing a bit with the input binds but I wasn’t able to make a neat config for my 6 button controller, and the d-pad problem persisted.
I wonder if the problem is the input utself (Android is not getting it properly) or the way it’s detected by Retroarch. I’d bet for the first one, but I’d rather ask 