The Sega SG-1000 (also called the Mark I) was Sega's first home console. Although a market test was conducted in 1981, it would be another two years until the SG-1000 received it's full launch, putting it in direct competition with the NES. Sega's arcade background meant that a number of arcade games were converted to the system, most of which were very well done.
SEGA SG 1000 II Console System Boxed NEAR MINT Working Tested Made in JAPAN 1632 - http://video-games.goshoppins.com/video-gaming-merchandise/sega-sg-1000-ii-console-system-boxed-near-mint-working-tested-made-in-japan-1632/
Sega's First Video Game Console - Sega SG-1000 Adrian and Phil take a look at Sega's first video game console - the SG-1000. Watch them play games inclusing Monaco GP, Exerion, Lode Runner and Flicky. Also a quick comparison with the Sega SG-1000 MkII.