Try creating an empty file (basic.tap) in the ROM folder and load it.

Thank you, but when the second controller is plugged in P1 cannot hotkey out. Both controllers have to be pulled and P1 reinserted to quit. Any ideas?

@Fellowgamer87
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

@arrowhead The driver is available to be installed from the RetroPie setup menu - in the Manage Packages / Manage driver packages section, so you don't need to install it manually. In fact, this is explained in the page I quoted, in the Installation section.

@caver01 Thanks very much. This is exactly what I was looking for. The DK scenario is one I hadn't contemplated (map all buttons) and a good idea.

I advice you to read this through before posting https://retropie.org.uk/forum/topic/3/read-this-first
Also you might not get much help here since you aren't using an official RetroPie Image