Support Information:
Device Type: Network Devices
Manufacturer: hp
Model: 506406764
Interface: PCI / ISA
Operating System: Windows 98SE
Age of Device: Not specified
FCCID: heden1207dtxr01

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=&qa5=12&qa7=1301&dp=3&qm0=506406764&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=hp+Network+Devices+hp+506406764+Windows+98SE+hed en1207dtxr01)

I found the driver files you are looking for. It is an Allied Telesyn AT-2500TX NIC .

Here is the link for the driver:

ftp://ftp.alliedtelesis.com/pub/nics/2500/2500v60.zip


Note: I've had conflicting reports that this nic card contains Realtek RTI8139 and GTS-515 chips. Can you verify this?