Got my MegaSD last night. Wow, it's excellent!
I can't get in game reset to work. The manual says to hold up+start for a few seconds. It just doesn't work at all for me. I've tried in many games, both cart and CD (but mostly CD).
I also enabled in game menu in the options and can not get that to work either.
And finally, I have noticed some minor graphical glitches. These might be normal, I haven't played a SegaCD in decades. But maybe not? One obvious place I see them is on the CD BIOS screen
MegaSD ver 1.01 R12
running on a MegaSG with firmware 2.1, using official Sega six button pad
I'll try updating both firmwares tonight.