Description
Lets you set what input device is to be used as a lightgun control. This will override the commands -mouse, -joystick etc...
Example
mame <gamename> -lightgun_device mouse
Command Format
<gamename> -lightgun_device <device>. The device can be keyboard, mouse, joystick, lightgun or none.. The example will set the default device if a game uses a lightgun to your mouse.
MAME's Default Setting
keyboard