NOTE: In the oldest PS/2 PCBs and even older USB PCBs joystick 1 acted like NumPad keys. In the newest USB PCBs joystick 1 now acts like the arrow keys. So you may need to make changes to your software based on this. For MAME, the newest X-Arcade controller config file makes this change for you.
Before you begin, first use the instructions here to open the X-Arcade™ controller. Then check out our video for doing the upgrade:
Here is video from Youtube for upgrade
If you removed more than one jumper at once and aren't sure where to put them back, check out the schematic diagram below for proper placement:
