Failed consoles you never heard of until *blank*
That stupid "debate" about SEGA Master System and seeing the Amiga thread gave me an idea. Popularity or lack of-of gaming system can really depend on region.So it's likely there are systems you never heard of until much much later or were taken by surprise when you saw a kid with the *blank* system.
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I will start with SMS. I stated this before but it wasn't until 1998 I even heard of it and even then saw it briefly on a retro game shop. I had no idea what it was but said SEGA on it. The clerk told me in 10 years it's the only one he had seen and until they got it in he wasn't even aware it existed.
3D0/CDi Wasn't until an issue of EGM 1998 I heard of them in a gaming magazine talking about past failures and other systems about to die.
Turbografx16 I didn't even know existed until the very early 90s when a friend owned one. We played Bonk and then in 1994 my teacher brought one to class and I played Vigilante. After that, I never touched one until I bought my own 6 years ago.
Various SEGA system offshoots. Wondermega, Mega Jet, and others. Not until I was a member of some SEGA game forums in the early 00s did I see mention of these.