The answer might surprise you.

That's right, the Sega Genesis (or Mega Drive, for those of you outside of the USA).  It even says so right on the front.  Yes, Sega was so proud of the Genesis being better than the NES that they actually branded the original model of the console with "HIGH DEFINITION GRAPHICS" for its US release.  And this was back in 1989, mind you, well before the PS3 and XBOX 360 claimed to have "high definition graphics".  Of course, not many would still call the Genesis' graphics "high definition" today, but back in 1989, it was a selling point in Sega's marketing campaigns, right next to that fancy "16-BIT" on the lower half of the cartridge slot area.

The moral of this little story is: be wary of corporate buzzwords and buzzterms, especially the recycled ones.

Haha wow

For what the TV's could handle in 1989, it was HD Gaming..

I remember playing games on my Genesis and says "damn look at those graphics"

Why is there a quarter in the picture?

Size comparison. 

I love that the old Genisis has the headphone jack right there on the system.

Wasn't really HD but man the games looked amazing back in the day.

yep, very cool indeed. for it's time it did have hd gfx haha.