Sega Master System / Mark III / Game Gear
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Unreleased prototype comprising of a graphic tablet and drawing software for the Master System. The hardware is a follow-up to the Terebi Oekaki released for the SG-1000 in Japan.
The hardware prototype is dated May 12, 1987. The software is dated August 1987. The hardware+software was supposedly sent to Tonka in the US for evaluation between September and October 1987.
Sega Graphic Board v2.0 [Proto]
There is a development page for Sega Graphic Board. Visit it to see technical discussion of this game.