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Saturn and Ps1 were released at same time.

DC was the evolution of industry. Got owned because of Sony's trashtalk

Sega CD, who cares (seriously). Not even the Turbo Duo had big success (and it appeared AFTER Sega CD)

Model 1, 2, 3, Naomi 1,2, Atomiswave (yes it has Sega's technology), Lindberg, etc. They are have been pioneer arcade boards, Sega owns anyone you wanna mention in that market.