Assuming you have legally obtained this BIOS from your own PS2 console (per DMCA and emulation legalities), here is the exact workflow for 100% functionality.
The erom (embedded ROM) that handles DVD videos is different in the v12. If you plan to run PS2 DVD backups that were authored with advanced menu functions, the 70012 BIOS handles the CSS (Content Scramble System) fallback more gracefully. scph70012biosv12usa200bin work
The V12 hardware (which this BIOS controlled) was notorious among technicians for a specific flaw. The BIOS worked to control the DVD drive mechanism (the Mechacon). However, the V12 model lacked a necessary diode to protect the drive coils. Assuming you have legally obtained this BIOS from
If the laser focused too hard on a scratched disc or a low-quality media, the BIOS would continue driving the laser coils until they burned out. Technicians called this the "POTS" failure. The BIOS did its job too well, driving the hardware until the physical components failed. This makes a working BIOS dump from a surviving V12 unit valuable for emulator preservation today. The V12 hardware (which this BIOS controlled) was