So here is a final update. I hooked up the Riverservice adapter to my Vewlix i/o. The controls worked. There was a delay....but they did work. So with that in mind, the Riverservice adapter seems to not be compatible with Sega JVS i/o model 837-14572
I have since decided to put Naomi hardware in my lindergh cab. So this adapter I am just going to take a loss and try to sell the thing.
On a side note, if anyone is looking to buy this, not necessarily from me....then do so as soon as you can. Riverservice has discontinued this item. Seems the only place you can get these now is an ebay user name videotronicsuk.......or something like that.
Thank you to everyone who pitched in to lend a helping hand.