Do I really need 2 switches?

When I mod my Genesis 1, do I really need to put in 2 switches?

I want to play some of my Japanese and Korean games on my US system. Does that mean I need to have 2 switches to overcome the territory lock-out? Or is that just for european systems?


Established Member
I would've thought you'd just need the 'language' switch, since US and Jap games are both 60hz.