I can see the edge connection on this adopter:
http://cambridgearcade.dyndns.org/?q=node/68And I can understand its application rather easy.
Besides that I am not sure I see the other item on this website.
In short, I know the pcb, the places to plug the cords into it on the side, I understand the edge-connector on the top, and I understand the need for the rainbow cable connected both boards together if I am using the edge connector. Besides that, I don't see where the cords are suppose to go on the example you shared, Ken. I just want to buy the right stuff and not break what I already have.
Ken, if I buy that $75 part you showed, will that be all I need to get this to work or should I get something else.