The first thing I discovered is that pin 2 is power (pins are odd on top even on bottom, with the slanted edge being 11), the power is a signal line however, most likely used for the Saturn to Saturn link to let each system know the other is there, its not suitable to power a device. But I had a hard time finding the ground no matter what I tried. Then I discovered the metal shielding inside of the port acts as the ground ( I will need to explore this more). comm pin 1 and 2 are also midi 1 and midi 2 from the sound chip. the other 6 ports that I know of so far, which are in the photo in the above gallery, are transmit, receive, and serial clock, on comm pins 3, 4, 5 and they repeat in the same order on 6, 7, 8. The first 3 go to sh2 master, last 3 go to sh2 slave. I will update this page once I learn what the other 3 pins do. There is a team working on a way to run a couple of older emulators via this port, and I am hoping to replace the internal save with a non volatile memory that connects via this port.