Instructions
Turn on your Sony PlayStation 3 and wait as it boots into the Sony PS3 menu. This is called the PS3 XMB menu and is where you can access all of the PS3̵7;s features, including playing your PS1 games.
Push the eject touch sensor on the front of the console and insert the PS1 game disk into the tray.
Navigate to the ̶0;Game̶1; section of the PS3 XMB and you will see a black colored disk icon. This is your PS1 game. It will read ̶0;PlayStation Game Disc.̶1; Select it by pressing the ̶0;X̶1; button on your PS3 controller.
Wait as the game boots. Your controller will shut down during the game boot up. Press the ̶0;PS̶1; button on your controller to reconnect it again.