I recently hooked up my US Saturn and it works fine, and I had a couple of Japanese Memory Carts in storage so I took 'em out and played them in the system... and they weren't recognized. Which was odd because they do work on my Japanese Saturn (which I got with those two memory cards, as well as a first-party S-Video cable).
So I'm wondering if the cards are region locked or not. Or if the connector on my system is screwed. Any thoughts?