Things You'll Need
Instructions
Select the "Playstation Store" icon on the PSP Slim menu. It is located all the way to the right of the PSP Slim menu.
Select "Games" from the store main menu and "Classics" to enter the PSX game section. Browse the games and select any you want to purchase.
Select "Add to Cart" and "Checkout" when you are ready to complete your purchase. Enter your credit card or Playstation Points card to complete the purchase and download your game onto the PSP memory stick.
Press the "O" button twice to exit the store. Select your game from the game section of the PSP Slim menu to start the game and play. Press the "Select" button and select "Assign Buttons" to choose which button layout to use on the PSP Slim gamepad. The default button layout is the most compatible. You can now play the PSX games on your PSP the same way you would on a normal Playstation console.