Shift MAME image help please!

[2huwman]

I'm running RetroPie v4.8 downloaded from here on a Pi 4. I'm playing in Tate mode in lr-mame2003, and also have ES rotated. I've got it all installed in a Quarter Arcade Dig Dug cab, and everything works well apart from the positioning of the screen in MAME. The reason I need to do this is because the LCD screen is mounted somewhat off centre in the cab. Can anyone explain which settings I need to adjust to move the image down a bit as it is too high (in Tate mode, which would be to the left in landscape). You can see what I mean in the photo below:

I've tried adjusting various cfg files without success. I thought the 'viewport' settings in the retroarch cfg would achieve this, but they have no effect on the image in mame.

Thanks for any advice!

[mahoneyt944]

So the image is centered on the monitor, but the monitor is not centered in the cab?

If so, you might be able adjust the overscan border in /boot/config.txt.

Also, some monitors have settings in their menu to adjust the vertical and horizontal position as well as overscan.

[2huwman]

@mahoneyt944 thanks, yes that's exactly the issue. I did try the overscan settings and was able to bring the top of the picture down, but the bottom didn't move so the image was squashed.

Good idea about the monitor settings, but sadly there isn't any menu button or anything to access any settings.

I was wondering if there was anything I could add to the individual game cfgs to move the image, as I've had to add something for rotation to get them to display the correct way up.

I could physically move the LCD down but that would involve cutting some of the plastic around the bezel which I'd rather not do.