I recently picked up the 2600-dapter D9 specifically for it's quadtari support. After playing around with it for a while, I was able to set all the pins to "auto sense" and in Stella, set the "left Joystick" to "Joystick" and right joystick to "joystick". Once I did this I was able to have two joysticks plugged into quadtari and play a two player game was is great...
My question was will it work with 4 player games if I purchased another D9? Curious to know if anyone has tried this.