To use a PS2 emulator like legally, you must use a BIOS file dumped from your own PlayStation 2 SCPH-70012
This is crucial for emulation because the 70000 series combined the main CPU (Emotion Engine) and GPU (Graphics Synthesizer) into a single chip. While this changed the physical hardware, the to later fat models for 99% of games. ps2 bios scph70012bin full