Have a favorite BIOS revision? Found a weird glitch in Xemu after flashing? Drop it in the comments.

You would physically flash a modchip or TSOP. In Xemu: You simply replace the flash file.

But here is where it gets confusing: The original Xbox didn’t have a user-replaceable Flash ROM in the traditional sense (like a RetroPie SD card). It was soldered to the motherboard. So why does Xemu care so much about a flash file?

If you’ve spent any time in the original Xbox emulation scene, you’ve likely heard two terms thrown around: (the beloved open-source emulator) and Flash ROM (the tiny, temperamental chip that holds your console’s BIOS).