Babystep1 - OSDev Wiki

Your first boot sector. Code The following code is the smallest possible example of booting code from a disk. The CPU starts in real mode and the BIOS loads this code at address 0000:7c00. "times 512-($-$$) db 0" is NASM's way of saying fill up 512 bytes with zeroes, and partcopy is going to expect that (200 in Hex = 512 in Decimal). Change it and partcopy will likely fail. There is often a boot s