Vectrex Controller Pin Outs

Vectrex Controller Pinout

Pin
1 Button 1
2 Button 2
3 Button 3
4 Button 4
5 Horizontal Pot
6 Vertical Pot
7 +5V
8 GND
9 -5V

The joystick potentiometers work by voltage division between -5V and +5V.
Actually, it uses a couple of resistors on each side to make it more like -3.4V to 3.4V.

Vertical Pin 6:
Voltage Direction
-3.4 V Down
0 V Center
+3.4 V Up

Horizontal Pin 5:
Voltage Direction
-3.4 V Left
0 V Center
+3.4 V Right