Hi, stumled onto this little tidbit of information: http://web.mit.edu/bunnie/www/proj/anatak/xboxmod.html Apparently there is an ( look at the image ) 16CLC63A next to the flash contaning the bios. My guess it does de-cryption of the bios 'on the fly'. Any other takers ? /Tony -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads