Yeah, took me a minute but figured that one out by re-installing the original SD card and seeing what's up. The 20 firmware doesn't have the 'emulator' folder in the FAT32 partition, but it has the others, which is what threw me off. I just copied everything from the original FAT partition into the 'ALIEN_GREY' partition (29Gb of goodies
and it all fired up. I got a copy of Stella to work too, the one Slaanesh modded for handheld use. I put it in the EMUS folder and set up the rom directory address by altering the config file with Notepad++.
Now...anyone have PRBoom/CZDoom working on this yet? That's my drug of choice
Oh, I'm also installing dual-boot Ubuntu on my XP laptop tonight, so I can edit things properly. I can't 'read' the linux partitions on the card, only on the firmware image, so I can't edit them. I can edit stuff on the FAT32 partition though, obviously, but I need to learn more