Getting Beast Busters to work in MAME 0.125

[majinbuu]

This has been bugging me for ages now.

No matter what I try I can't seem to get this game to work properly. I am using the mouse as the gun and need help calibrating it because on default settings the aim is way off with the onscreen crosshair. If you fiddle with the dipswitches you can enter a service mode to calibrate the gun. However, since I gave up on getting this to work for a long time and just have restarted now I have forgotten how to get into the service mode of the game. Then after calibration how to get out with the new settings saved.
Help please :)

[Lerxstnj]

While in game, Just hit TAB to get to the menu with DIP switch settings.

[emceelokey]

Did you try blowing on it yet?

I had problems with that game too. I remember the arcade version was some weird stationary light gun game where there was a screen on the gun and it would look like lazers were shooting from your gun to the screen. I know I've had othr light gun games to work but I don't think I ever got that game to work.

[majinbuu]

I calibrated the gun successfully, still no luck. On some parts of the screen it's accurate but on others it is way off. Maybe it's something to do with the aspect ratio?

I'm giving up on the stupid thing and playing vs Duck Hunt instead :)