I saw one of these on Ebay, so bought it, Although I have no games that take advantage of it, yet...
The box is in OK condition
This is the documentation that came with it
I have two of these flyers for some reason
The user manual
An informational leaflet
The unit itself in its original bag
Top and bottom of the add-on
Front with "sound" control, and close up of the model/serial label
The cartridge and pass-through connector for games
It plugs into the side and makes the whole unit L O N G
?OUT OF MEMORY ERROR