Actualy your adapter is the official one from capcom but at the same time capcom has used the Sega io pcb in kits (cap vs snk 2 came with a sega io insted of capcom io). Sega on the other hand has two official IO cables. The first model Which only converts video & input. And a second model which does everything the capcom IO does & more. It's all listed up on sega-naomi.com I personaly have a naomi 2 (& gd drive) with a capcom io since my cabinet is a capcom candy cab (capcom impress 29).