The 4LAN is a PCI board with four independent ethernet controllers.  

Specifications:

• National Semiconductor DP83816 ethernet controller chips
• Texas Instruments PCI2250 PCI-PCI bridge chip
• High-performance PCI busmaster interface with large buffers and interrupt holdoff
• Shielded RJ-45 connectors with LED's for speed and activity
• 33 Mhz, 32 bit PCI 2.3 expansion cards, universal for 3.3V and 5V power and signaling
• IEEE 802.3u 10 Mbps 10BaseT and 100 Mps 100BaseTX, half and full duplex
• IEEE 802.3u Auto-Negotiation
• IEEE 802.3x Full duplex flow control
• Four ports short standard PCI board, power max 2.8W when 3.3V is available
• Operating temperature 0-60 °C

Note: This device is not compatible with dual PCI riser cards.

Drivers can be downloaded from: http://www.national.com/appinfo/networks/macphyter2.html