– Once booted, you can access the SHARE partition over network (Samba share) or by plugging the SD card into a PC with Linux/Mac/Paragon software for Windows. Place your game ROMs in the appropriate system folders (e.g., snes , megadrive , psx ).
For a Raspberry Pi 3, pick the Batocera image built for the Raspberry Pi series (Pi 0/1/2/3 or Pi 4 depending on release notes). A 32 GB microSD card is a common choice because it provides ample space for a system image plus many ROMs and BIOS files. download batocera 32gb raspberry pi 3 link