Creates a bootable disk image in assembly. Following basic steps on http://mikeos.sourceforge.net/write-your-own-os.html

1. compile with nasm:

nasm -f bin -o boot.bin boot.asm

2. write to a virtual floppy:

dd conv=notrunc if=boot.bin of=boot.flp

3. Run with qemu:

qemu-system-i386 -fda boot.flp