# directly
qemu-system-i386 -kernel kernel.bin

# via Grub:
./mkiso.sh kernel.bin
qemu-system-i386 -cdrom os.iso

# support exit
-device isa-debug-exit,iobase=0xf4,iosize=0x04

# remote gdb (port 1234):
-s

# stdio serial:
-serial stdio

# IDE drive:
-drive file=hd.img,if=ide