No, that's not right at all. I can run Dissidia around 7 FPS with my 1.6 GHz dualcore processor on my laptop. A poor CPU will NEVER just give you a black screen, especially if everything else is working such as Windows. Then there's something else with the actual application that is faulty. When a weak CPU struggles, what will happen is that everything takes a lot of time to load and you will experience graphics freezes, but that's not what you are describing. You are describing that you specifically get a black screen.
Further, did you actually check to see if the game you attempt to play is supported yet? While JPCSP is the most advanced PSP emulator currently available it does not support all games yet and games it won't support will obviously not run at all and indeed, be stuck at a black screen when you press Run. Further, are you running with the latest rev?
Further, did you actually check to see if the game you attempt to play is supported yet? While JPCSP is the most advanced PSP emulator currently available it does not support all games yet and games it won't support will obviously not run at all and indeed, be stuck at a black screen when you press Run. Further, are you running with the latest rev?