Somebody on ebay must be trying to get his listing more visibility
The 1990s-vintage Z-80 SBC must be a pretty cool technology indeed, to be Arduino AND Raspberry PI compatible 
http://www.ebay.com/itm/Zilog-Z80-Single-Board-Computer-Keyboard-Screen-Arduino-PI-/121077260982?pt=UK_VintageComputing_RL&hash=item1c30c462b6