This emulator works great when it comes to compatibility, but I can't seem to figure out how to switch the display orientation to vertical.
I tried editing the Mame .ini file by changing the value in ScreenRotation from 0 to 1. This flipped the horizontal image upside down, and overscanned the image.
The in-game menu didn't have an option either. In other versions of Mame, its pretty easy to find. Has anyone had any success with this?