== Fire Button Notes ==
* Pin 5 - Fire 3 - This is an undocumented and very rarely used input (used by the AMX Mouse for example).
* Pin 6 - Fire 2 - This is the standard button, used by most games.
* Pin 7 - Fire 1 - This is the extra button, used only by a few games.
== Select Signals (COM and COM2) ==
COM is the "common" pin for the Joystick 1 direction/button switches. COM2 for Joystick accordingly. The COM/COM2 pins go LOW when selecting the corresponding keyboard row.
== Y-Cable ==