Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
M
The Libretro doc page on Caprice32 is pretty extensive - did you look into it ?
No, RetroPie cannot be installed on the SteamDeck, it's not using a compatible Linux distro.
If you have a SteamDeck you may want to take a look at EmuDeck for something similar to RetroPie.