I can find very little information about them. This is pretty much it, and only mentions the E-90 and the ET-6. I have my eye on one that says ET-6 on the back, and No. 1 (i think) on the front. It looks like a Supervision mated with a DMG, and this was the offspring. Does anyone know if it is compatible with Game Boy carts, or have any additional info. I really like the look of it, but I am currently in the market for a game boy clone that is a little different looking (kinda like this).
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the page you linked says its not compatible with carts apart from its own (of which there is only one(?))
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Supervision and another were mentioned, but not game boy. Based on the theme of the site I guess it makes sense to assume they would have considered cartridges for something popular if it looked like it might work.