NSW based is the Australia locked software you are referring to. In order for these games to play they require a NSW set chip card, a controller and door optics. The door optics, which are attached to the door closure latch, work with the controller. Its a security device. It can be bypassed easily. The controller is a plug in device that slides in on the tray in your top photo above the CPU, and plugs directly into the backplane.
The NSW based games are more easy to set up and are generally less expensive than the World Based games. Many of the games are versions of World Based single screen games too, but they are for dual screen machines instead.