PC 2 joysticks adapter

pinout

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

15 pin D-SUB male connector  to the computer

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 female connector  to the Joystick 1 & 2

Source:www.pinouts.ru