It is not possible to configure the player 2 controls in the "tab" menu of mame 0139 since it only recognizes player 1 if we are using a usb interface. Mame 0.139 does not take the retroarch setting correctly. The A button and the L button on the player 2 do not work.
same problem here.
the same here, buttons A and L does not work on player 2, I use 2 DS3 BT, any solution?