How To Compile XBoot
http://rubyforge.org/projects/xboot/

The tools that I use to compile XBoot with are NASM the netwide assember,
and partcopy to copy XBoot to the first sector of a disk. Both of these are
available on the internet, or you could just download "XBoot Tools" from the
XBoot RubyForge Files.

To compile XBoot with nasm, make sure nasm and the XBoot assembly source 
are in the same folder. In the Command Prompt type 'nasm xboot.asm -o xboot.bin'
the .bin extension doesn't really matter, its just for me to know its compiled as a
flat binary file. After nasm compiles xboot without any problems, you can use
partcopy to copy the binary file to a disk. To do this, in the Command Prompt type
'partcopy xboot.bin 0 3 -f0 0' which copies the first 3 bytes to the beginning of the
floppy disk (f0). Then type 'partcopy xboot.bin 3E 1C2 -f0 3E' to copy the rest of the
binary file to the rest of the first disk sector. Make sure you replace xboot.bin with
whatever you compiled xboot to.