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The Sega Mega Drive debuted in North America in August 1989, with a regionwide release in September of that year. Due to trademark issues, it was renamed the "Sega Genesis", and has always operated under this name under this region.
In the US, the console was distributed by Sega between 1989 and 1997. It was then passed to Majesco, who kept the system alive for an extra two years before it was shelved. In Canada, the Mega Drive was distributed by Irwin Toy in its early years, however Sega inevitably took back the distribution rights when the console proved successful. Many Canadian units and games were imported from the US. The Genesis 3 was also released in this region.
All North American units output an NTSC signal.