Things You'll Need
Instructions
Download and install PSX2PSP. This program converts your PS1 games to the PSP format. Insert your PS1 game into your computer's optical disc drive.
Open PSX2PSP. Click "ISO/PBP" and select your PS1 game from the list that appears. Click the "Output" button and select a place to save the PSP game file.
Click "Convert" and your PS1 game will be converted to the PSP format and saved in the directory you specified in step two.
Connect your PSP to your computer with the USB cable. Select "USB Connection" from the PSP main menu. A window will appear on your computer and you will see the files and folders on your PSP memory stick.
Go to where the PSP game file was created and right-click its folder. Click "Copy" and go into the PSP memory stick from the computer. Open the "PSP" folder and right-click the "GAME" folder. Click "Paste" to transfer the PS1 game to the PSP.
Press the "O" button on the PSP to disconnect it from the computer.