Hi,
I recently acquired a Nolan Bushnell Signature Series Atari 7800 Prototype System, along with some other development gadgets and accessories. I am still going thru the lot, but if you are intrested in adding this rare piece to your Atari collection the link to the auction is below.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...em=330233565355
Thanks and good luck!