Things You'll Need
Instructions
Download DOSBox Easy Navigator, the program that allows you to play computer games on your PSP. Save the file to your desktop and double-click to unzip.
Place the DOS games you wish to play on your PSP into the "Game" directory of the "DOSBox" folder. These can be downloaded from "abandonware" websites (see resources), found on auction sites such as eBay, or purchased from the bargain bins of computer game stores.
Connect your PSP to the USB port of your computer. Turn the system on and select "USB Connect" from the console's "System" menu.
Copy the "DOSBox" folder unzipped in Step 1 to the root directory of your PSP. This directory will be shown in "My Computer" as "PSP" or "Memory Stick."
Enter the folder "MS_ROOT/PSP" unzipped in Step 1. Copy the folder "Game150" to the "PSP" directory of your PSP. Eject, remove and reset your PSP.
Launch DOSBox Easy Navigator from the "Game" section of your PSP's main menu. Select the game you wish to play with the D-pad and launch it with the "X" button.