This brings us to the legal rub: Distributing them is illegal, which is why emulators never bundle them. Users must "dump" their own BIOS from a console they own.
In the emulation world, the SCPH10000 BIOS is often cited because it is considered a "clean" or baseline version of the firmware. While many emulators can run using BIOS files from later models (like SCPH-70000), the early files are often preserved for their historical accuracy and compatibility with a wide range of games. Sony Playstation 2 Bios File Name Scph10000.zip
Rename the file at your own risk. PCSX2 identifies the BIOS by its internal header, not the file name. You can rename scph10000.bin to anything.bin and it will still work, but standardizing on the original name prevents confusion. This brings us to the legal rub: Distributing
Ask any PCSX2 (the leading PS2 emulator) veteran: Not all BIOS files are equal. The SCPH-10000 is the "unicorn" for three reasons: While many emulators can run using BIOS files
The SCPH-10000 BIOS is incredibly minimal. It lacks the DVD playback user interface, the "Panasonic" branding (later models had DVD licensing logos), and the HDD utility. As a result, than the SCPH-39001 BIOS. For speedrunners and testers, those seconds matter.