Hi,
First, check the board's name print on it. It is probably an AT-GPIB/TNT. It could also be a AT-GPIB, which are older.
You can then find the drive that supports this hardware in a given OS at:
http://www.ni.com/support/gpib/versions.htm
Follow the link of the driver version to download the driver.
Hope this helps.
DiegoF
National Instruments.