Things You'll Need
Instructions
Connect the PSP to the computer with the USB cable. Click "View files/folders" from the window that appears on the computer.
Download DGen for the Sony PSP (see Resources for link). The download will come with a folder containing all the DGen application files. Right-click the downloaded folder and click "Copy."
Open the PSP memory stick from the computer and open the "PSP" folder on the memory stick. Right click the "GAME" folder and click "Paste" to transfer the DGen program to the PSP memory stick.
Right-click one of the Sega Genesis ROM files and click "Copy." Open the "GAME" folder that you just copied DGen to. Open the "DGen" folder and right click the "Rom" folder. Click "Paste" to transfer the Sega game ROM to the PSP memory stick.
Press the "O" button on the Sony PSP to disconnect it safely from the computer. Select the "DGen" program from the PSP menu's game section. The DGen menu will appear, and you will see your game rom files.
Select one of the game ROMs to play it on the PSP.