Systems
Choose a system category for setup notes, supported content and BIOS information.
MustardOS identifies a content folder, assigns it to a system, then offers the compatible Pickles, RetroArch and external choices installed on the device. A system is the shared identity used by core assignment, artwork, friendly names and launch settings. It is separate from the emulator or core used to run the content.
Getting content ready
- Place content under
ROMSon SD1, SD2 or supported USB storage. - Use a recognisable folder name. MustardOS normalises spaces, hyphens, underscores and common aliases when it performs automatic assignment.
- Open the folder in Explore Content. MustardOS creates a directory assignment when a known folder name is found.
- Open Content Options and choose Core whenever you want to change the system, core or player.
- Place any required BIOS files in the BIOS location shown on the relevant system page. Content on a core that cannot run without a BIOS stops at launch and lists the files it needs.
A folder assignment is inherited by its content. A content-specific assignment can override one game without changing the rest of the folder.
Players and launchers
| Choice | Purpose |
|---|---|
| Pickles | MustardOS’ own Libretro core player, using the active frontend theme and Pickles settings. |
| RetroArch | The RetroArch Libretro frontend and its configuration system. |
| External | A standalone emulator, engine, reader, media player or port launcher. |
Pickles and RetroArch use the same installed Libretro core file where the core supports both players. External entries use their own launcher scripts and may be restricted to a device or processor architecture.