@YFZdude I’m also looking at the MAME2016.rmp file (I didn’t change anything in here) but it says
input_player1_analog_dpad_mode = “1”
input_player1_btn_select = “-1”
input_player1_btn_up = “-1”
Is this correct considering select is usually an 8? It doesn’t make sense to me why the select and button up are the same?
Glad it's working for you.
I'm still learning some of this but just for reference, I think a "-1" would be the equivalent of saying that button is either disabled or undefined. All regular buttons probably should have a number with no sign (+ or -) associated with them. An analog function usually mentions an axis and those can have a negative sign for one direction and a positive sign for the other direction.