Still no good here ...
Now, I get a black screen, the unit locks up. No mame.log file is generated. Tried several robotron sets.
This is SOOOO weird ... does someone that has it working want to hook a brotha up with a complete, working set archived DIRECTLY from the SD card? Just PM me ... I'd really like to help track down why I'm like the last dude on the planet that can't play this.
To the people that have this working ... Did you ever install the SDL package to NAND what was required by some homebrew/emu stuff? Maybe there is some conflict or something. I'm just grabbing at straws here.