I have a model 1 Sega Genesis. I want a Sega CD and I am assuming the 2nd version (the one that sits side by side with the Genesis) will be the easier model to find? What is everything required to hook up and play a Sega CD unit with a model 1 Sega Genesis? I see various things listed in Ebay auctions but I want to be certain I obtain every cord, connector etc necessary, thanks in advance.