You don't need to install smart boot manager. Run it from floppy and choose to boot cdrom from menu.
Get sbm floppy image and write to floppy.
http://members.optusnet.com.au/atar/sbootmgr.img
http://slax.linux-live.org/dl/floppy.img.gz

To write to floppy in windows use this tool :
http://members.optusnet.com.au/atar/rawritewin.exe

To write img to floppy in linux:
dd if=image of=/dev/fd0