it doesn’t! But it can fake it very well in some situations.
By the way, my game does some extensive parallax scrolling. The original game boy can’t keep it up, unfortunately, but it runs full speed on Game Boy Color.
Yes, his jam is not about strictly following the Game Boy limitations, but I did anyway.
You can check it, if you want: https://rodrigocard.itch.io/abovesky
cheers