I managed to get a few games working. But with Mortal Kombat 4 it keeps failing. This is the error: The selecting rom is missing 1 or more required rom/CHD images. (the color is also not green but more yellow) I have found a thread about this issue in this forum but it doesnt help me.(18 month old thread) I downloaded the rom in many different places. (i am working with mame0154b_64bit) MK2/MK3 do work properly!