How to Use PS2 BIOS for the PCSX2
Unlike a computer's BIOS, a gaming console's BIOS cannot be modified by the end user to increase performance of the hardware it controls. In the case of the Sony PlayStation 2, its BIOS can be used on a computer in order to play PS2 games you have legally purchased. The PS2 emulator, PCSX2, uses the PS2 BIOS to read games without the actual PS2 console, and loads them using the computer's disk drive.
Download and install PCSX2 on your computer from the developer's main website. Open the program on the computer.
Single-click the "Config" button on the PCSX2 main window. Click the "Configuration" button on the small context menu. The configuration window will open.
Single-click the "Set Bios Directory" button on the bottom of the configuration window. A new window will open.
Locate the PS2 BIOS file on your computer. Single-click the BIOS file with the ".bin" extension. Click "OK" on the bottom of the window to use the PS2 BIOS with the PCSX2 emulator. The emulator can now be used to play PS2 games.