You will have to set the BIOS location in RetroArch.

everything is saved to RetroArch.cfg) then place all BIOS files for all emulators in the same folder (again, typically RetroArch/system folder.)

You can place them where ever if you use per-core configs (I use RetroArch/system/mednafen_saturn_bios).

Typically this is the RetroArch/system folder.

Place them in the appropriate folder under RetroArch.Download the two BIOS files you need (they are here in a zip file.).If you are using per-core configs MAKE SURE YOU’VE LOADED THE Mednafen Saturn config file first! Don’t overwrite the default RetroArch config file with a new default BIOS directory location – unless you’re going to put ALL emulator BIOSes in that directory (see 2.C.Set the directory to wherever you saved the two BIOS files in step 2.The first directory option under the Directory section is System/BIOS Dir.Near the bottom of that column is the Directory section.It is in the second column – “Settings” the one with the gears for the icon.Open RetroArch and enter the Directory location.

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Scph5500.bin scph5502.bin and scph5503.bin are in the Bios folder and all seems fine and recognized now I only have to take care of SCPH1001.BIN (checksum ok) and I've read everywhere that the file was case sensitive so I renamed it scph1001.bin, apparently does not belong in the Bios folder. Hi, I am trying to figure out the PSX emulator on my retropie3 and I think I'm almost getting there. Download the PlayStation 1 BIOS (SCPH1001.bin) required by PlayStation 1 emulators for playing PlayStation 1 games on PC or smartphone.

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