Probably best to get the drivers from the manufacturer - 3COM.
http://www.3com.com/products/en_US/searchbyproduct.jsp?path=download&searchby=sku&search=3c509b
Remember to vote :)
Download the appropriate driver from these links
http://www.driverfiles.net/Network-Adapters/3Com/3C509b/download/page,sh,16991,895,9,.html
http://drivers.softpedia.com/get/NETWORK-CARD/3COM/3Com-EtherLink-III-16Bit-ISA-Network-Interface-Card-3C509-and-3C509B.shtml
http://members.driverguide.com/driver/detail.php?driverid=42104
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