There are many problems to connect 8 bit uC to PCI card, try connect to ISA ethernet card instead!
Please take a look at
:arrow:picnic
picnic is the effort to bring PICs (8-bit microcontroller by Microchip) and NICs (network interface controllers) together. The current hardware configurations are a PIC 16F877 micro controller, and an NE-2000 compatible ISA ethernet card with a Realtek 8019AS chip. The PIC software features a Web server and supports ARP, IP, ICMP, TCP, and HTTP.