GammaOS does run Pico-8 in RetroArch. Simply download the Retro8 core and make sure media / image viewing is turned off: Settings - File browser - Use Built-in Media Player (off) / Use Built-in Image Viewer (off). It will also work in the Daijishō frontend if you set the default player to 113 - pico8 - RetroArch 64 - retro8.
The problem on my RG405 with GammaOS was that retroarch only displayed the png and not started the pico-8 game. I have searched for hours to disable the image preview and now it works! You find it here:
Apps->RetroArch()->Load Content->scrolling down to the end->File Browser->disable: „Use Built-In Image Viewer“
After disabling everything works fine and I enjoy the amazing pics-8 games on my RG405 console 👍😄
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