In December 1988, Atari and Tengen began manufacturing and selling their own Nintendo-compatible cartridges that circumvented the NES security system.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 7: JUVENILE DELINQUENCY Light Signs of Developer Relations

"In December 1988, Atari and Tengen began manufacturing and selling their own Nintendo-compatible cartridges that circumvented the NES security system."

The court records Atari's December 1988 move to manufacture and sell compatible cartridges outside Nintendo's licensing route and capable of circumventing the NES security system.

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Source title Atari Games Corporation and Tengen, Inc., Plaintiffs/cross-appellants, v. Nintendo of America, Inc., and Nintendo Co., Ltd.,defendants-appellants, 897 F.2d 1572 (Fed. Cir. 1990)

Source authors U.S. Court of Appeals for the Federal Circuit

Source year 1990

Confidence high

Importance high