I can define joystick buttons, so the MiSTer can see the USB stick, but after saving the settings the core doesn't see it. I press coin button, nothing happens. Tried 2 different USB sticks, and 3 different arcade cores.
I have an older MiSTer (older software) which works fine with these same USB sticks.
Any help appreciated.
EDIT: I found the solution was I needed to define the joystick buttons in the system settings