Network boot disk

I need to make a network boot disk with multi, nic cards. Their are alot of sites to do this with tcp/ip but non with dhcp. I have alot of computers with pci-nics that will not boot to the network. I need a generic boot disk that I can add the NIC driver to, so it can connect to a DHCP network to load the new O/S. And it needs to fit on a floppy disk.