PC Specs:
Intel E4500 CPU @ 2750 MHz (250 x 11)
MSI 945GCM5-F V2 (FSB 1333) Mother Board
2GB DDR2 667 (trying to get 4GB to work with MB)
160 GB HD (Have a 64 GB SSD to swap in for final production if everything can fit on it)
Arcade VGA 3000 (Thanks for XP x64 drivers)
Windows XP x64 (first time using 64 bit windows, so far so good!)
MaLa 1.7.2.0 front end
CabMAME64 v141
Update:
Since a hole has already been cut into the control panel for the ‘Start / Turkey Call’ button I decided to use a 3 in 1 button with a similar footprint for the Front End interface.


Press the Yellow 3 in 1 button to boot the PC and turn on the cab (smartstrip)
The machine will boot into the Mala front end.
Player 1 side controls the Front end.
Press either Player 1 start or the Green 3 in 1 to launch game from front end.
Press Red 3 in 1 three times to exit game. I modified the MAME source to on-screen prompt for two more presses when the red button is pressed. It counts the presses and Exits to the front end on the third press. Press Red twice to Quit Game, Press Red once to Quit game, Exit game. You have three seconds to press three times or the counter resets.Press Red 3 in 1 once in Mala and the ‘Quit?’ appears. Press Red again (no) to return to Mala, or press Green 3 in 1 (yes) or Player 1 start button (yes) to exit. Mala is set to shutdown PC. The cab turns off (smartstrip.)
The coin mech works and accepts US quarters and .984 tokens.
Hold Player 2 start and drop a coin for Player 2 (coin 2) specific credits. Most games don’t need this.
Technical Stuff:
U360 #1:
Button 1 - 6 = Player 1 Buttons 1 - 6
Button 7 = Player 1 Start and Green 3 in 1 Button (wired in parallel)
Button 8 = Red 3 in 1 Button
Green 3 in 1 Button = Launch game from front end / Player 1 Start / Confirm front end Exit
Red 3 in 1 Button = 1. Exit Game (press 3x) / 2. Exit Front End (Auto Shutdown PC which also turns off Cab, need to press Green 3 in 1 to confirm Exit)
U360 #2:
Button 1 - 6 = Player 2 Buttons 1 - 6
Button 7 = Player 2 Start
Button 8 = Coin Mechanism Switch
Player 1 coin (coin 1) = Button 8 NOT Button 7
Player 2 coin (coin 2) = Button 7 AND Button 8 (Hold Player 2 start and drop in a coin. Mainly for Gauntlet 2p)
Yellow 3 in 1 Button = PC power Button to turn Cab on.
EDIT: Cleaning up the thread. GroovyMAME confirm_quit works for exit.