Bios V18 Usa 230: Scph-90001

: Non-volatile memory data (system settings).

The is the final slim PS2 model sold in North America. Its BIOS version 1.8 (often labeled 230) is unique and important for modding, homebrew, and emulation. scph-90001 bios v18 usa 230

The "USA 230" designation explicitly references version 2.30 of the United States region code embedded in the ROM chip. This chip contains the fundamental code required to initialize the PS2 hardware, display the iconic startup screen, and hand off control to a game disc or memory card. Why the V18 BIOS Matters for Homebrew : Non-volatile memory data (system settings)