It only supports the games listed in docs online (classic vertical and horizontal games early 80's), there hasn't been any updates since maybe 2014 and never will be any in the future.
Now, I own an use 2 of these boards in cabs and they are really impressive for what they are. The gun input is just for the nintendo VS duck hunt and hogans alley. But when it comes to plug and play, nothing odd feeling about the games or any control lag, friends can't find there way into a menu with some strange 20 button combo and for the games it supports it's pretty impressive.
If I had a use for another SD board I'd buy anther in a tick. I've tried the arPicade, and this other one, but it's all the same leg humping of retroarch and attract mode giving a reach around while mame has trouble getting a tongue in and add in the 6 or so frames of lag even on a crt and things become meh with a pretty menu.
ArcadeSD is right there with the controls / zero lag and games feel right. I suspect there is some sort of static binary conversions and some other cool coding going on with the arcadeSD. If you're serious about the classics (supported games) in a cab with a crt and want a solid product, that's what the arcadeSD is for.
my 2 bones.
good day.