I believe that the +Ve pin is pin 8 (screen is facing upward here).
Here you can find what I have measured on my type cover port.
I also measured the resistances between the pins. Resistances 6-5, 6-4, 6-3, 6-2, 6-1, 2-1 and 9-10 vary, depending on whether we put COM on pin 6 or the other...