The machine is a Dell
Pentium 4 2.8 Ghz
Using Award BIOS version A00
I would suggest you download the latest BIOS from Dell as I'm sure they released something newer than A00. You might also want to find (very inexpensive on ebay) some Intel Pro 100 NICs as they seem to work the best on m0n0wall. BTW, I think you would be better off running 1.3b10. It's very stable and you have the hardware to run it on.
Good luck, CS...