I followed the instructions on http://rom-o-matic.net/
and downloaded a boot ROM for my NIC
I then (sort of) followed the instructions for a USB Key from http://etherboot.org/wiki/removable
such that I already had the rom so did not need to use the 'make' command
I used the 'dd' command to transfer the image to the USB Key but got an error message when trying to boot from it.
I was hoping to find an easier way than the Wiki page explaining how to do this with grub for those of us that are not so Linux familiar. I need to do some more work and maybe I should take this to a separate thread