Things You'll Need
Instructions
Download "OpenMugen" from the site in Resources and double-click to unzip.
Connect your PSP to the USB port of your computer using the system's USB cable. Turn on the console and open the "System" menu, then choose "USB Connect."
Navigate to the root directory of your PSP, which will show up in "Finder" or "My Computer" as "PSP" or "MemoryStick."
Copy all files from the unzipped "OpenMugen" directory to the "Game150" directory of your PSP. Eject and remove the console.
Launch "OpenMugen" from the "Game" menu of your console. Use your PSP's D-pad and action buttons to control the game's characters: attacks and special moves differ between fighters.