Keyboard, Mouse and other input devices cables and adapters scheme
This adapter will make it possible to connect 1 extra joystick to the PC. The gameport contains pins for two joysticks but you will need this adapter to be able to connect two joysticks to one connector
  PC Joy 1 Joy 2
+5 VDC 1 1 -
Button 1 2 2  
Joystick 1 - X 3 3  
Ground 4 4 4
Ground 5 5 5
Joystick 1 - Y 6 6  
Button 2 7 7  
+5 VDC 8 8  
+5 VDC 9 9 1
Button 4 10 10 2
Joystick 2 - X 11 11 3
Ground 12 12  
Joystick 2 - Y 13 13 6
Button 3 14 14 7
+5 VDC 15 15 8

Note: Since pin 12 is often used for MIDI-signals on gameport equipped soundcards it´s better to use the ground from pin 4 & 5, pin 15 is also used for MIDI-signals...

15 pin D-SUB male connector layout
15 pin D-SUB male connector
at the computer
15 pin D-SUB female connector layout
15 pin D-SUB female connector
at the Joystick 1 & 2
According to 2 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: Tomi Engdahl"s joystick page, from Hardware Book
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