For me, I think it’s the Megadrive/Genesis.

I was a Nintendo kid, originally. We had a NES and a Gameboy in our house, and I loved them. But during a visit to the US in the summer of 1993, I got to spend pretty much the whole of the 4th of July at a family friend’s house in Massachusetts, playing Genesis games with a bunch of American kids. That cemented it in a special place in my mind.