@l_oliveira: Thanks for the input. The games probably don't require input from a specific USB port when used with an actual PS2. However, they do require a train controller that solely comes with a USB plug. Apart from that, there's not much of a choice, except for the standard dual shock 2 controllers (DESR-10, and similar), which cut half of the gaming experience. And here lies the problem... According to an initial press release by Sony Global, the USB port can handle "USB game controllers". However the Japanese manual only explains digital camera connectivity with regard to that single USB port. It also carries a note that, contrary to the PS2, only one USB port is available, and that it cannot be used as a hub... There is actually no information mentioned on USB game controller support. I still hope that an avid collector with access to a PSX and any of the above-mentioned USB train controllers will come forward to elaborate on this issue. Interestingly, most people either collect/put away their PSX, or they use the standard non-USB PS2 controllers, hence I couldn't find any information on DESR models and USB connectivity online.