3Com Etherlink II (8 or 16-Bit 3C503) 7920-xxxx

This is the 3Com Etherlink II (8 or 16-Bit) 7920-xxxx Network Adapter card shown. Listed below are the possible Interrupt Request Line (IRQ), Base I/O Address, and Base Memory Address jumper/switch configurations:

	

Setup Choice for Windows NT 3.5
3Com Etherlink II Adapter (also II/16 and II/16 TP)

Note1: - If you have an older version of this card (rev. 01-0c or before), you might find that
         it is not reliable on fast, high-end computers. These cards may cause non- maskable
         interrupts (NMIs). This is a documented problem with Microsoft LAN Manager 2.1 as well.
         The best solution is to upgrade your network card.


Note2: - If you have two or more COM ports on your computer, you might find that the EtherLink II
         card will conflict with one port. Two common symptoms are that the workstation fails to
         start, and that an error attributed to the EtherLink II card is logged in Event Viewer.

To solve conflicts between an EtherLink II card and your COM ports, try the following:

1. Choose the Network option in Control Panel.

2. Double-click the EtherLink II entry in the list of Adapter Cards.


3. In the configuration dialog box, change the interrupt number from 3 to another interrupt,
   such as 5. Make sure that the interrupt you choose is not being used by another device.

For the 3Com EtherLink II/16 TP card on a 486/50 or faster computer, we suggest that you use
the shared-memory mode of this adapter with Windows NT.

There is a known issue with regard to the 3Com EtherLink II card and COM2.  If an interrupt 
conflict exists on IRQ3 between the preferred default on the card and COM2, the system will
silently disable COM2, because the network adapter card loads first. Make sure there are no
conflicts before you run Setup if you want to use COM2.


Interrupt Request Line (IRQ)
SOFTWARE CONFIGURABLE
Default - IRQ3

Base I/O Address
BASE I/O JUMPER BLOCK
	J1	J2	J3	J4	J5	J6	J7	J8
250h	OFF	OFF	OFF	OFF	ON	OFF	OFF	OFF
280h	OFF	OFF	OFF	OFF	OFF	ON	OFF	OFF
2A0h	OFF	OFF	OFF	OFF	OFF	OFF	ON	OFF
2E0h	OFF	OFF	OFF	OFF	OFF	OFF	OFF	ON
300h	ON	OFF	OFF	OFF	OFF	OFF	OFF	OFF
310h	OFF	ON	OFF	OFF	OFF	OFF	OFF	OFF
330h	OFF	OFF	ON	OFF	OFF	OFF	OFF	OFF
350h	OFF	OFF	OFF	ON	OFF	OFF	OFF	OFF

Base Memory Address
Base Memory Address JUMPER BLOCK
		J1	J2	J3	J4	J5
DISABLED	ON	OFF	OFF	OFF	OFF
C800h		OFF	ON	OFF	OFF	OFF
CC00h		OFF	OFF	ON	OFF	OFF
D800h		OFF	OFF	OFF	ON	OFF
DC00h		OFF	OFF	OFF	OFF	ON

Cabling for this Adapter

	Thick Ethernet via AUI Connector
	Thin Ethernet via BNC Connector

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