The is the vital system software required by emulators like PCSX2 and AetherSX2 to execute game ROMs. The BIOS recreates the internal hardware environment of the original console, initializing settings and handling region restrictions.

The BIOS architecture evolved significantly over the PS2's lifecycle. A comprehensive collection typically includes: v1.0 (Proto Kernels):

The most common version used in later "Fat" and early "Slim" consoles. v2.30 Series: