Because this BIOS is from the late-stage SCPH-90001, it includes aggressive disc authentication routines. For portable play (where you likely use disc images like .bin/.cue or .chd), in your emulator. This actually reduces battery drain because the BIOS isn't waiting for a false-positive disc seek error.
: Use a modded PS2 to "dump" the BIOS from the chip to a USB drive using tools like BIOS Dumper v2.0 . scph90001biosv18usa230 portable
: This specific version (USA v2.30) is considered one of the most stable and feature-complete, having ironed out bugs present in early 10000-series Japanese releases. Role in Emulation (PCSX2 & AetherSX2) Because this BIOS is from the late-stage SCPH-90001,