It is highly stable for memory management and HDD emulation.
In the context of xemu, the (often referred to simply as the BIOS) is a 256KB, 512KB, or 1024KB binary file that contains the code originally found on the Xbox motherboard's flash memory chip. Because xemu emulates the hardware at a deep level, it cannot start without this firmware. xemu flash rom
Absolutely. This is the "purest" way.