I wish I could tell you step by step what I did, but here is the gist of it. The newest build of retropie will install o2em great. My problem was, I didn't want to start all my customization for everything else I installed 2 years ago. Therefore, I took a brand new microsd and installed the newest r...

It's been years now and I still can't get this working. Google always brings me back to this thread and I end up staying up all night and giving up for a couple months and then I start all over again and again and again.

I want to try to be more specific with this question as I think I see others asking it, but I really can't find anybody answering is constructively (no offense). Is there a way to use my Windows machine to take a RaspberryPi .IMG image file that wishes to be extracted to an "X" GB sized Micro SD car...

I had the same issue and here is what my extremely unconventional way to get it to work was. You see, apparently, the MAME emulator itself is the issue as it will only assign a maximum of 16 inputs per joystick. There is a guy out there with another project called retrocade that recompiled the mame4...

You guys get this to work on retropie yet? I would absolutely love to get O2 working with my cocktail table! And I actually own every single O2 game produced in the U. S. so, there's that.