I’ve been using this method.
Playing
- Modified SD card adapter that plugs into the DC serial port (eBay, AliExpress: “DC SD reader”) £10/$15
- Dreamshell & ISO Loader homebrew software (free, included with the above)
- Memory card
Ripping
- make_iso package from dcswat
- 32-bit Windows VM to run the tools
- compatibility list
- image formats are ISO/CSO/CDI/GDI