I was able to get most pce cd's to work by checking the .cue file and making sure the letters were lowercase that were supposed to be and .iso is lowercase. I cannot figure out how to get sapphire to work though (Ginga Fukei Densetsu Sapphire) Sapphire requires the arcade card on a real pc engine cd unit. I was able to play it on my pi B with beta 3, but when I bought my new pi 3 and put on beta 4 it will not work. I get the cd boot up screen and then I hit the run button. Very quickly the loading screen shows up but then goes away and kicks me out to emulation station again. did something change in beta 4 for the pce engine that this is not working for me now?