I think I screwed something up on the pre-made retroie image. Because I re-flashed the pi and set I2C to be loaded through sudo raspi-config, now when I reboot it does detect my I2C. One step closer to my mobile retropie!
Don't use pre-made images, they're terrible. Plus you won't get any support here or anywhere.
Since I like to help anyway, I'll give you a hint: the most likely issue is that the init file is missing, the image is corrupted and you can't do much unless you reinstall over (and completely mess the messed up setup).
Another possibility is that there's an easier fix by running e2fsck on Putty but I hightly recommend to give up and build your own fruity cake :)
@Rubencn1234 Put it in the same directory as the roms. If you put it in the BIOS directory, it doesn't seem to find it. I had to put it in the roms directory (with the correct name) in order for it to work.
Which emulator are you using? FBA works fine without "neogeo.zip" in the roms folder. I have it just in the BIOS folder.
@Rubencn1234 Check to make sure you have the right BIOS file. neogeo.zip needs to be ~1.5 MB and CRC-32 should be 20F12195
OK, so I've been googling up a storm looking at the options. I think I'm either going to go with a piglow, and use some code folks have already put together. Seems like the three arms can show something like Temp, CPU Load, something else (I can't remember).
But what really looks like it'd be cool is the Displayotron. Seems I could set it up to show the system and ROM running on Retropie. And I figure the backlights could be setup to have a color that'd match the system (like Red for Nintendo or something). And then use the bargraph to show CPU load. But what I'd love to do is use the joystic on the Displayotron as a safe shutdown button. Could I do that? Does it sound at all reasonable?