PCSX2 - General Guide
PCSX2 Links:
Where to put the games
Playstation 2 games should be put under the retrodeck/roms/ps2/ directory.
PCSX2 supports the following formats: ISO BIN with CUE files CHD
Does Ryujinx require BIOS or Firmware?
Yes, they need to be put directly into the retrodeck/roms/bios/ without any subfolder.