This one is completely outta the blue. It was thought that Atari's only venture
into a computer keyboard add-on was "The Graduate" Computer that was
developed by PVI for Atari and was canceled in the fall of 1983 when
James Morgan took over Atari. However this oddity turned up and it
appears that Atari was toying around with the idea of either its own
add-on computer system or perhaps this was a possible restyling of
"The Graduate" into a 3/4 sized version of the Atari 2600jr case which
was also being considered for the unreleased "Voice Commander"
module for the Atari 2600 line. This unit is just a mockup, there are
no internal electronics. Hopefully more will come to light on
this rather eye opening find sometime in the future.