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showkey
When I try to run this in ssh I get the error
Could't get a file descriptor referring to the console.
So perhaps I need to run this from USB Keyboard and main screen?
Yes. Press F4 from Emulation Station to get prompt.
Plug In USB Keyboard.
showkey press enter then use Joystick to see Key Codes, etc.
keycodes
Up 103
Down 108
Left 105
Right 106
P1 Start 2
P2 start 3
Red 29
Left Coin Door 6
Right Coin Door 7
Back Panel Button 1 == 28
Back Panel Button 2 == 1
Back Panel Joy stick same as front