I opened up a PIX 520 firewall we had laying around our company and it appears to be a regular old Intel Pentium II box. One DIMM of RAM, two PCI cards (Firmware/boot and Intel Ethernet) and a single ISA card for the serial/console access.
I had a question about..... upgrading it. If I were to remove all three of the pertinent cards and put them in a more powerful Intel P3 or P4 PC, would it work?
-Bob