I googled so much and couldn't find anything specific on it. It did look more like jumpers at first but I thought it'd be odd to have those accessible like that.
Right. Maybe time to get the multimeter out and borrow a logic analyser. And learn how to use it...
As dosxuk says - sensible thing is to work out what the chip it is connected to inside is and then have a look around for a datasheet or others who have reverse engineered.
Logic analyser probably only useful if you have actual data being passed through the port (i.e. something plugged into it)