The BIOS (Basic Input/Output System) acts as the bridge between software and hardware. While the software emulates the PS2’s CPU and memory, it cannot legally include the BIOS because that code is copyrighted by Sony.
If you don’t own a PS2 and can’t dump a BIOS, you cannot legally use PCSX2. Consider buying a used PS2 (often $30–50) — it’s worth it for legal emulation and preservation. pcx2 bios rom
The BIOS (Basic Input/Output System) is the core system software or firmware originally found in physical PlayStation 2 consoles. Its "story" in emulation is one of essential functionality: The BIOS (Basic Input/Output System) acts as the
Most PCSX2 guides will provide BIOS files for this reason. You must supply your own. pcx2 bios rom