Welcome to the club. I use an Everdrive to boot US games on it. Works great. I remember considering buying a Sega CD "converter" back in the 90's and being told it's hit or miss.
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I am debating if I want to get a Nomad. And I always wanted a Lynx.
I have one of those Aliexpress Sega carts and not having much success with what works. Genesis works great. One 32x game worked which was After Burner. The others I tried only show the logo and then a black screen or no boot at all. I did find an "updated" version where it says everdrive but don't know if that would work.
I did boot the Mega CD bios files and managed to get some Europe games working but for USA, I only get sound no picture.
I am debating on getting an Everdrive X3. I mean I could go after the pro to preserve my mega cd.
I also have a mister I can run all of this out of but the 32x core on that isn't perfect or completed.
Also I'm currently working on my PC Engine. I get a white/pink screen when I turn it on. So I am trying to figure that one out.
The CD drive of that works. The System Card works since allows me to play music, lol