Pinout diagram on power supply shows a diagram where the flat part (key) of the plug is at the top,
Pins #2 and #1 are the top pins
Pins #4 and # 3 are the bottom pins and are closer together
output 1-3 = 5vdc, 800ma
output 2-4 = 10.5 vdc, 1200 ma
Pins 1 and 2 are NEG
Pins 2 and 4 are POS...