diff --git a/share/man/man4/dc.4 b/share/man/man4/dc.4
index 5f376dec4492..903877d03612 100644
--- a/share/man/man4/dc.4
+++ b/share/man/man4/dc.4
@@ -143,6 +143,8 @@ Alfa Inc GFC2204 (ASIX AX88140A)
 CNet Pro110B (ASIX AX88140A)
 .It
 LinkSys LNE100TX v4.0/4.1 (ADMtek AN985 Centaur-P)
+.It
+3Com OfficeConnect 10/100B (ADMtek AN985 Centaur-P)
 .El
 .Pp
 The
diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c
index 294f81b0c991..c083bc40a423 100644
--- a/sys/dev/dc/if_dc.c
+++ b/sys/dev/dc/if_dc.c
@@ -46,6 +46,7 @@
  * Xircom X3201 (www.xircom.com)
  * Abocom FE2500
  * Conexant LANfinity (www.conexant.com)
+ * 3Com OfficeConnect 10/100B 3CSOHO100B (www.3com.com)
  *
  * Datasheets for the 21143 are available at developer.intel.com.
  * Datasheets for the clone parts can be found at their respective sites.
@@ -196,6 +197,8 @@ static struct dc_type dc_devs[] = {
 		"Hawking CB102 CardBus 10/100" },
 	{ DC_VENDORID_PLANEX, DC_DEVICEID_FNW3602T,
 		"PlaneX FNW-3602-T CardBus 10/100" },
+	{ DC_VENDORID_3COM, DC_DEVICEID_3CSOHOB,
+		"3Com OfficeConnect 10/100B" },
 	{ 0, 0, NULL }
 };
 
@@ -1987,6 +1990,7 @@ dc_attach(dev)
 	case DC_DEVICEID_FE2500:
 	case DC_DEVICEID_EN2242:
 	case DC_DEVICEID_HAWKING_PN672TX:
+	case DC_DEVICEID_3CSOHOB:
 		sc->dc_type = DC_TYPE_AN985;
 		sc->dc_flags |= DC_64BIT_HASH;
 		sc->dc_flags |= DC_TX_USE_TX_INTR;
diff --git a/sys/dev/dc/if_dcreg.h b/sys/dev/dc/if_dcreg.h
index d4536c7f4c05..d15d68cb3c66 100644
--- a/sys/dev/dc/if_dcreg.h
+++ b/sys/dev/dc/if_dcreg.h
@@ -867,6 +867,16 @@ struct dc_softc {
 #define DC_DEVICEID_AL981	0x0981
 #define DC_DEVICEID_AN985	0x0985
 
+/*
+ * 3COM PCI vendor ID
+ */
+#define DC_VENDORID_3COM	0x10b7
+
+/*
+ * 3COM OfficeConnect 10/100B (3CSOHO100B-TX)
+ */
+#define DC_DEVICEID_3CSOHOB	0x9300
+
 /*
  * ASIX vendor ID.
  */
diff --git a/sys/pci/if_dc.c b/sys/pci/if_dc.c
index 294f81b0c991..c083bc40a423 100644
--- a/sys/pci/if_dc.c
+++ b/sys/pci/if_dc.c
@@ -46,6 +46,7 @@
  * Xircom X3201 (www.xircom.com)
  * Abocom FE2500
  * Conexant LANfinity (www.conexant.com)
+ * 3Com OfficeConnect 10/100B 3CSOHO100B (www.3com.com)
  *
  * Datasheets for the 21143 are available at developer.intel.com.
  * Datasheets for the clone parts can be found at their respective sites.
@@ -196,6 +197,8 @@ static struct dc_type dc_devs[] = {
 		"Hawking CB102 CardBus 10/100" },
 	{ DC_VENDORID_PLANEX, DC_DEVICEID_FNW3602T,
 		"PlaneX FNW-3602-T CardBus 10/100" },
+	{ DC_VENDORID_3COM, DC_DEVICEID_3CSOHOB,
+		"3Com OfficeConnect 10/100B" },
 	{ 0, 0, NULL }
 };
 
@@ -1987,6 +1990,7 @@ dc_attach(dev)
 	case DC_DEVICEID_FE2500:
 	case DC_DEVICEID_EN2242:
 	case DC_DEVICEID_HAWKING_PN672TX:
+	case DC_DEVICEID_3CSOHOB:
 		sc->dc_type = DC_TYPE_AN985;
 		sc->dc_flags |= DC_64BIT_HASH;
 		sc->dc_flags |= DC_TX_USE_TX_INTR;
diff --git a/sys/pci/if_dcreg.h b/sys/pci/if_dcreg.h
index d4536c7f4c05..d15d68cb3c66 100644
--- a/sys/pci/if_dcreg.h
+++ b/sys/pci/if_dcreg.h
@@ -867,6 +867,16 @@ struct dc_softc {
 #define DC_DEVICEID_AL981	0x0981
 #define DC_DEVICEID_AN985	0x0985
 
+/*
+ * 3COM PCI vendor ID
+ */
+#define DC_VENDORID_3COM	0x10b7
+
+/*
+ * 3COM OfficeConnect 10/100B (3CSOHO100B-TX)
+ */
+#define DC_DEVICEID_3CSOHOB	0x9300
+
 /*
  * ASIX vendor ID.
  */