Added the category for Ohio Art Accessory
Can't make changes to Nintendo category naming conventions, Jason reserves this right. So this is why I'd say Famicom Network System should be used because we aren't going to change the other cats to match if we called it Family Computer. I have made the "Famicon Network System" sub-cat in NES/Famicom.
Also, I'd put the Dataship 1200 into NES/Famicom Consoles section. I don't think the fact that you can't put carts into it matters as it is still a Famicom. If the add-on comes with a game, then it would be put into the game category and not the accessory category.