At the Codes screen (in the Options menu), press RIGHT (5), LEFT (3), UP, UP.
At the Codes screen (in the Options menu), press DOWN, UP (8), DOWN.
At the Codes screen (in the Options menu), press UP, DOWN (8), UP.
At the Codes screen (in the Options menu), UP, DOWN, UP, DOWN, UP, DOWN, UP, DOWN, UP, DOWN.
At the Codes screen (in the Options menu), press RIGHT, UP, DOWN, DOWN, UP, RIGHT, RIGHT, UP, DOWN, DOWN.
To use this, you'll need a TV with progressive scan capabilities. Go to Options, then Codes and enter: RIGHT, UP, RIGHT, RIGHT, UP, RIGHT, RIGHT, RIGHT, UP, RIGHT. You'll have to reboot your PS2 once the screen turns blue.
At the Codes screen (in the Options menu), press DOWN, LEFT, LEFT, DOWN, LEFT, DOWN, RIGHT, DOWN, LEFT, DOWN.
At the Codes screen (in the Options menu), press LEFT, DOWN, UP, LEFT, RIGHT, UP, DOWN, LEFT, RIGHT, DOWN.