Please do the following:

Play as the "Original Default" Police Woman and Detective from "The Keisatsukan 2" (Japanese version of Police 911 2) in the comfort of an American Police 911 2 machine. Simply at the Demo/Attract Screen, press the trigger 12 times and at the 12th time, hold the trigger. Insert your game room's currency and release it ONLY after you see the "Character Select" screen comes up. If done correctly, you can choose a uniformed Police Woman with a 5-round Revolver and a Japanese Detective with an 8-round Semi-Automatic. If credits were already inserted, you need to press the trigger 12 times, hold the trigger at the 12th time, press the Start Button, and wait until the "Character Select" screen comes up. The code input MUST be all performed before you insert coins/press start button.