Strictly speaking, playing ISOs on a real Xbox isn’t emulation – it’s native execution. But it’s worth mentioning because it is the best way to play Xbox “ROMs.”
Si aún posees tus discos originales de Xbox (algunos valen cientos de dólares, como OutRun 2006: Coast 2 Coast o Marvel vs. Capcom 2 ), puedes volcarlos a tu PC: roms de xbox classic