So, you've got your Nintendo Family Computer and, well, it's more of a console really. What it needs, especially if you are to convince your parents that it really is a computer and that it can do more than play games, it requires a keyboard and a version of BASIC. It needs you to bid on this Family Basic eBay auction and get the gear that will allow you to turn your Famicom into something vaguely resembling an 8-bit micro.
The Family Basic you'll be bidding on comes with its box, the poly inserts, the lovely red and white keyboard, the BASIC cartridge, the manuals and some ads and other leaflets. The seller ships worldwide and for free.