The 9 Pin D-Sub on the back is to carry the 3 voltage rails intro the device from the power brick.
i can't express who much more awesome this is. great work.
Im glad you like it guys! im glad to finally finish this thing now. I've put it up for sale on eBay. Starting price 99P International postage avalible. Just type in NES MPS in ebay and it'll come up. I cant wait to start the new one. Thinking of having Dual gameboys in there synced together. But thats all im saying for now