I am somewhat confused. I intend to use the VGA666 board on my RP2, but I would like to wire arcade controls to GPIO as well. The VGA666 manual states that it will only work on B+/2 boards. It goes on to say pins 2-21 will be used and pins 22-27 will be free. Are pins 28-40 off limits for some reason? I have never experimented with GPIO and my Pi hasn't arrived in the mail yet so I apologize if this is a silly question.
I assume by this tutorial that everything must be grounded as well so if pins 22-40 are in play that nets me 1 stick and 3 buttons.
https://learn.adafruit.com/retro-gaming ... pi/buttons