Things You'll Need
Instructions
Download the PS1P Alpha 1 emulator (see Resources).
Connect your USB cable to your PSP, then to your computer.
Turn on your PSP. Go to "Home" then "Settings" then "USB Connect." Your PSP memory stick will now show up as a removable drive on your computer.
Double-click the file named ps1p_alpha1.zip to open the archive.
Click "Extract To" then select the "GAME" folder on your PSP. The PS1P Alpha 1 will now be installed on your PSP. Access the emulator by going to "Home," then "Games" on your PSP.