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 VDC11-
Button 122 
Joystick 1 - X33 
Ground444
Ground555
Joystick 1 - Y66 
Button 277 
+5 VDC88 
+5 VDC991
Button 410102
Joystick 2 - X11113
Ground1212 
Joystick 2 - Y13136
Button 314147
+5 VDC15158
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
PC 2 joysticks adapter visual pinout:
PC 2 joysticks adapter diagram
click to enlarge
Source(s) of this and additional information: Tomi Engdahl"s joystick page, from Hardware Book
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