Read the post I put up last week (specific for MAME), but it t has a bunch of tips I came across along the way. Got that black screen myself at one point. And depending on the system, I had to run some in "compatibility mode". I'm running Windows 10, not all my Emus liked that. This is more of an art, than a science. It's the right combination of settings that seems to make it all work.
Sandy