XBox Games Pass Ultimate link is not for Xbox Games Pass, it's Xbox Live when it loads the page.

@Dynamo11 If your first system was the Super Nintendo but your first game was Mario Kart 64, did you never play your SNES? Because 64 games only work on the 64. A little confused there. Anyway, My first system was the Atari Video Pinball systems, released back in 1977. If you don't count that, then it would be the NES, I got it for Christmas in 1985. Then the first game would have to be Super Mario Brothers.