[K12OSN] DHCP and different LTSP distros

[Mella]

Now I found a problemmaker! :)

It is Compaq Deskpro SFF client with built-in Intel PXE? card driven 
only from Compaq BIOS. It just cannot boot from another server than 
DHCP! And Intel boot rom is not separately flashable.
It claims  "Old PXE API detected, using PXENV+ structure" when booting.

If i tried this with IBM T20 (3com PXE card onboard), all works OK 
without TFTP service in DHCP server.

Unfortunately I have 50 Compaq's here :(