The Athena used the NSC 800 microprocessor which was a low consumption version of the Zilog Z80.
The computer had a battery which allowed it to be used for two hours or six hours in "awake" state.
Apparently it was the first "clamshell" laptop computer to be exhibited, but never went into production. It was designed by David Mitchell.
We need more info about this computer ! If you designed, used, or have more info about this system,
please send us pictures or anything you might find useful.