The story of the MCPX Boot ROM is a perfect example of the cat-and-mouse game between console manufacturers and the preservation community.
For years, the MCPX Boot ROM was considered a "black box." Hardware hackers knew it existed, but extracting it was difficult. It was buried inside the chip, inaccessible to standard probes.
This was the MCPX Boot ROM.
The Boot ROM's job was singular and ruthless. Upon power-up, the CPU would jump to this tiny code to perform a "chain of trust."
Once the environment is ready, it hands over control to the Flash ROM (the BIOS) to begin loading the dashboard or a game. File Requirements and Verification