Press the action button on your whell (jog Dial) or the center button on the direction pad. Push the entire thing down, that is also the same button.

Or you can re-set any button to act as the coin...



> Hi all,
>
> I am new to MameBoy and have a Casio EM-500. I cannot find a button (or method
> to map) to insert coins. Please help.
>
> Thank you!
>