FFFF:0000, Too many F.
That's a history story about DOS and CP/M times...
When CPU has been reset, it will back to real mode and set SS=FFFF IP=0000.
Here has some code which is mapped from BIOS. Sometime when we take a
reflush to BIOS, will see something called "BootBlock", and can not be
modified. This is what it used for. Commonly, it will do something like
check memory, test if disk is ok, decide which device is used to boot, blah
blah blah. Finally, It will get a block(about 512 bytes) of code, load it to
0000:7c00, then jump into it. It is the code we call MBR. Then, Computer is
booted.
If u wanna to get this code, try to read BIOS.