This could also be used to run out-of-region discs on the US market version of the Playstation. It refused to start with a out-of-region disc, but you could start with a US disc and then swap in the out-of-region disc while running, provided it never detected the lid opening.
I had a little spring for mine that clipped over the prong in the lid at one end, and pressed the switch down at the other. You could still open/close the lid, but the Playstation wouldn’t recognise it.
