So, to update... I finally got a working Pi, and I think I have things squared away. It appears that the latest 4.4 version of Retropie struggles on a Pi Zero with the default SNES emulator. I downloaded PiSNES in Retropie-Setup and set it as the default. Then I edited /opt/retropie/configs/snes/snes9x.cfg...
...and fixed the button configurations there (I swapped the default configs for A&B and X&Y, since they were backwards on the FPZ). I also updated MaintainAspectRatio to be 0, so games didn't have black bars on the left & right.
Note that the hotkeys for PiSNES are different from the Libretro emulators. Instead of the power switch, the hotkey is Select. So exiting is Select+Start, Saving is Select+R, Loading is Select+L, etc...
Code:
sudo nano /opt/retropie/configs/snes/snes9x.cfg...and fixed the button configurations there (I swapped the default configs for A&B and X&Y, since they were backwards on the FPZ). I also updated MaintainAspectRatio to be 0, so games didn't have black bars on the left & right.
Note that the hotkeys for PiSNES are different from the Libretro emulators. Instead of the power switch, the hotkey is Select. So exiting is Select+Start, Saving is Select+R, Loading is Select+L, etc...