Hi, I asked the developer of lr-caprice32 if he would add save states to the core and he has now kindly implemented them. https://github.com/libretro/libretro-cap32/commit/8dc1fe206abc480cfd55c419a4f24f227495488b You can enable this functionality by running the "update from source" option for lr-caprice32 under RetroPie setup.

SOLVED: In Retroach, internal resolution must be 336 x 240 ! Just good to know

@davidgrohl Learn how to use SFTP or Samba-Shares. https://retropie.org.uk/docs/Transferring-Roms/#sftp https://retropie.org.uk/docs/Transferring-Roms/#samba-shares If using SFTP, go to /opt/retropie/configs/all/atari5200/retroarch.cfg, or if using Samba-Shares, go to configs/all/atari5200/retroarch.cfg. Add core_options_path = "/opt/retropie/configs/atari5200/retroarch-core-options.cfg" to the retroarch.cfg above the #include "/opt/retropie/configs/all/retroarch.cfg" line.

RetroPie has some systems flagged as main or core systems, and as you've now discovered, the Atari 800 and 5200 are not part of that group. Going through the menu you will find it, and many others, in the optional systems menu. That process will add the emulator and create the necessary ROM folders. The Binary option is always the safest and easiest way to install an emulator. Installing from Source is more advanced and only needed if you're after a recent code change to that emulator, but you run a higher risk of encountering bugs.