So, I got a PS Vita recently. As I was poking around trying to figure out how everything worked, I noticed this odd, unmarked port on the top of the system.
It's only labeled as "Accessories Terminal", but I can't find any indication as to what accessories are used here. I've checked the manual, but it doesn't shed any light on this mystery. Even the official PS Vita Accessories page doesn't offer any information.
What can I use with this port?