Check the pics. Want to sell it all together. Untested take it for what it is. These boards and two carts came to me with a bunch of other stuff. Will be shipping it from Canada won't be back to Detroit for a couple months. The four slot is missing ribbon cables I believe ?
4 slots don't have any ribbon cables. They should just fit the top and bottom board together without any additional cables. The only cable interfaces are to the memory card reader, the mini marquee lighting, and I believe the credit counters.