@mitu lol, i didn't know that, ty

Update: For the 4-Player Xtension the IPAC2 runs players 1 and 3 (and left click) and the MiniPac runs players 2 and 4 (and right click and trackball). I tried both the new 1.50a firmware (on the IPAC2 only, it doesn't support MiniPac) and the 1.39 firmware on both the IPAC2 and MiniPAC and configuring as gamepads. Even though all the connections looks programmed properly, it was very inconsistent for what actually worked as a gamepad. It was about 40% working. I may have made some missteps. I have gone back to default for both IPAC2 and MiniPAC in my 4-Player Xtension. For others with the 4-Player Xtension who want to be able to get back to default configuration for the IPAC2 and MiniPAC, here are the files: https://drive.google.com/drive/folders/1qpPneE7E88_qc65JXOPq6gZYvpD1Ubki?usp=sharing

@Tigry Thanks for sharing your solution, glad you found it. Just for completeness, I was going to suggest that you could use @meleu's joystick-selection tool to see if your sticks are configured as player 1 +2. If not, that could've been the reason why they didn't work in RetroArch.

Yep! All set!

The 001, 002 etc extensions means that they are sequential parts of the same compressed file. Try opening the 001 file with 7Zip, or something else that reads 7Z files.

I just wrote a "snes" folder to the roms map on the usb drive and put a game in that was't available in the existing rom list on my raspberry. The game is transferred and working. It looks like i don't need the raspberry to create the rom folders to transfer more roms. Writing the subfolders manually in the "roms" folder seems to work.

@guruchoc I installed Xarcade2Jstick via the retropie menu, that seemed to do the trick, I can play Bubble Bobble to my hearts content, thanks for the help. G

@vincentm638 videos are all outdated

@retroprogrammer How do you select "Exit: save for all games"?

You need to quit emulationstation, then continue on to 6. This tutorial was very helpful, I have been wanting to do this for awhile.

Aspect ratio

@used2berx Hey I had Space invaders on my Atari 800 xl (same as 5200) It was unique yes, but for me, the 2600 version was the best ! Actually I even prefer the 2600 version over the original arcade ;)

For our http://gamepieadvance.com/ project, we are trying to get to a build that would require NO soldering. We have a plan for that, but it's not yet proven. In the meantime, our current DIY kit requires fairly minimal soldering. You need to solder a header onto your Pi Zero, and you can choose to solder a wire depending on how you want to hook up batteries. Most of the project is hacking on plastic with an Xacto Knife.

@TCMOrangeJoe You could put the code in a pastebin for us to have a look at, we might be able to spot the problem.

@UDb23 Thanks, I will try one of those