If you place a Universal Mr Do! game in your normal, vertical orientated Jamma cab, then the screen will be upside down. If you place the board in your normal Jamma cocktail, then both player 1 and player 2 will be upside down.
This alternate set of rom images for three of the program roms will invert the image into the more usual Jamma orientation. There are no switches to enable or disable this, you will need to revert back to the normal rom set should you wish to revert to normal behavior.
For other hacks to Mr Do!, including high score saving, visit JROK's site