IBM has released a Giabit Ethernet (Fiber) Adapter Driver which provides OS/2 support for selected Intel Gigabit Ethernet chipsets (82542GC / 82543GC /82544GC). OS/2 Gigabit Ethernet support is limited to adapters designed for Fiber (1000Base-SX) connection.
http://www7.software.ibm.com/2bcprod.nsf/...
BTW. you need a Software Choice account for downloading
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