Typically extracted as a .bin file, often accompanied by others like .nvm or .rom0 .
Here’s a helpful, accurate write-up about — what they are, why you need them, and how to obtain and use them legally. pcx2 bios rom
It depends on how you obtain it.
The most significant part of the BIOS story is its legal status. Because the BIOS is copyrighted software owned by the console manufacturer, it is not included with the emulator itself. The official "correct" way to obtain one is to dump it directly from your own physical PlayStation 2 hardware. How to use it in PCSX2 Typically extracted as a
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. The most significant part of the BIOS story