Yeah that's what I mean...
Is it the same port then any other console ,I think I found a thrid party NeoGeo controller also the chinese box says,but i don't know because i don't own a neogeo
Just checked, the connector on the system has 8 pins on the top row, and 7 on the bottom..so if you check the connector of the controller and it looks like a serial port type connector with that many holes, it could be it.