Hi; I get the following from wikipedia, and something very similar from PCGuide and other manuals. They all leave me with one thing I don't understand: http://en.wikipedia.org/wiki/BIOS "Upon starting, a personal computer's CPU runs the instruction located at the memory location FFFF0h of the BIOS. This memory location is close to the end of system memory. It contains a jump instruction that transfers execution to the location of the BIOS start-up program. This program runs a Power-On Self Test (POST) to check that devices the computer will rely on are functioning; it also initializes these devices. Then, the BIOS goes through a preconfigured list of devices until it finds one that is bootable." In detail, here is the question: During a cold boot; at the instant of powering up, before resetting; How does the jump instruction get into system memory location FFFF0h? "Upon starting, a personal computer's CPU runs the instruction located at the memory location FFFF0h of the BIOS. This memory location is close to the end of system memory." Is memory location FFFF0h, an address in the BIOS CMOS (in my system, the CMOS of the Intel Firmware Hub)? Or, is it a location in main system (RAM) (high memory)? If so how does it get there? If it is hardwired or embedded in some way, why is it considered part of system memory. I have got the rest of how my computer boots. Regards Bill