nordlead on 04 October 2010
looking into it, it almost seems as if they (the higher numbers) counted the liscensed products (like the Genesis 3 by Majesco and such) as Sega Genesis systems.
The Genesis was discontinued in 95, and sales in 1994 were 13m in NA (source: Business Week, May 23, 1994, Number 3373.). I found sales dated as reaching 19m sometime in 1999 (source: Newsweek, September 6, 1999, Volume 134, Number 10.), 4 years after the Genesis was discontinued.
I don't know how VGC counts it, but I could see ioi having VGC sales as only being the Sega Genesis, not the liscensed product, but then again I am guessing and would have to ask him.
