Extract everything to the root of your SD card and be sure to first remove any existing firmware file
Everything else goes into /Assets/pce/common/
CD files must be in their own individual subfolder with the respective cue/bin inside and it is recommended to organize other files in subfolders
Optionally, place a System Card BIOS (with extension .pce) inside /Assets/pce/common/BIOS/
JB Firmware V0.9
You can enable "Resume Browser" in the options so the browser will remember the last game selected
You can disable "Auto-add to Library" to prevent every game you start from being added to the Library
For original System Card functionality a .pce placed in the BIOS folder will override Duo's own built-in BIOS, for example, playing audio and CD+G discs
When loading a subfolder Duo checks if there is exactly 1 .cue file inside. If so, it will be treated as a CD game
BIOS preferences can be adjusted per CD game. If there is exactly 1 .pce BIOS file inside a CD subfolder, that BIOS will automatically replace the default BIOS when running that game
A physical System Card will take precedence over all other specified BIOS
WAV files are supported for audio tracks. WAV files must have a standard 44 byte header and contain an exact multiple of 2352 bytes (1 frame of CD audio), not accounting for the header
CD+G discs are supported. The track type should be "CDG" in the .cue, with a sector size of 2448 bytes
You can force SuperGrafx mode by naming the file with the extension ".sgx"
CD Backup RAM, which sometimes can be utilized by specific Hucards, is recognized by game signature