Clarification on PSX multi-disc support (M3U / CUE / CHD) in EmulatorJS 4.2.x

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Hello EmulatorJS team,

I’m integrating EmulatorJS (currently 4.2.3) into an Android WebView-based project and need an official clarification regarding PlayStation (PCSX-ReARMed) multi-disc support.

I want to avoid assumptions and work strictly within supported configurations, so I’d appreciate clear answers to the questions below:

1. As of EmulatorJS 4.2.x, is multi-disc PSX emulation officially supported when using .m3u playlists (CUE/BIN-based)?

2. If .m3u files are detected and passed to the core, does EmulatorJS currently implement any CD-ROM tray / disc swap handling, or is this left entirely to the libretro core?

3. Is the error
   “[libretro INFO] Error opening CD-ROM plugin!”
   a known limitation when launching PSX games via .m3u in web environments?

4. Is there a documented, supported workflow for PSX multi-disc games (CUE/BIN or CHD) that is expected to work end-to-end in EmulatorJS today?

5. The release notes mention “Fix CHD support” in v4.2.2 — does this include multi-disc CHD scenarios, or only single-disc CHD loading?

6. If multi-disc PSX is currently not supported by design, is this considered:

   • a core limitation,
   • a web environment limitation,
   • or an EmulatorJS loader limitation?

Any confirmation (even a simple “not supported / not planned”) would be extremely helpful to guide architectural decisions on our side.

Thank you for your work on EmulatorJS and for your time.

Best regards,
DAN

[ethanaobrien]

As of EmulatorJS 4.2.x, is multi-disc PSX emulation officially supported when using .m3u playlists (CUE/BIN-based)?

Yes

If .m3u files are detected and passed to the core, does EmulatorJS currently implement any CD-ROM tray / disc swap handling, or is this left entirely to the libretro core?

If the retroarch tells emulatorjs there is multi-disk available, it will appear as an option on the toolbar

Is the error “[libretro INFO] Error opening CD-ROM plugin!” a known limitation when launching PSX games via .m3u in web environments?

No

Is there a documented, supported workflow for PSX multi-disc games (CUE/BIN or CHD) that is expected to work end-to-end in EmulatorJS today?

Yes, https://docs.libretro.com/library/pcsx_rearmed/#multiple-disk-games

The release notes mention “Fix CHD support” in v4.2.2 — does this include multi-disc CHD scenarios, or only single-disc CHD loading?

I don't know

If multi-disc PSX is currently not supported by design, is this considered

It is supported. If it does not work, it is a RetroArch limitation.