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       # 3COM CORPORATION
       
          ETHERLINK II TP (3C503; ASSY.#6330)
       
          NIC Type         Ethernet                                      
          Transfer Rate    10Mbps                                        
          Data Bus         8-bit ISA                                     
          Topology         Star                                          
          Wiring Type      Unshielded twisted pair                       
                                                                         
                           DIX transceiver via DB-15 port                
          Boot ROM         Available                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        DC CONVERTER                        |
          |------------------------------------------------------------|
          |                Setting                 |        JP1        |
          |----------------------------------------+-------------------|
          | » |    DC signal disabled (10BaseT     | Pins 2 & 3 Closed |
          |   |             standard)              |                   |
          |---+------------------------------------+-------------------|
          |   |   DC signal enabled (non 10BaseT   | Pins 1 & 2 Closed |
          |   |              network)              |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       TRANSMIT LEVEL                       |
          |------------------------------------------------------------|
          |                Setting                 |        JP2        |
          |----------------------------------------+-------------------|
          | » |    Transmit level select normal    | Pins 2 & 3 Closed |
          |   |        (10Base-T standard)         |                   |
          |---+------------------------------------+-------------------|
          |   |   Transmit level select low (non   | Pins 1 & 2 Closed |
          |   |         10Base-T network)          |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       RECEIVE LEVEL                        |
          |------------------------------------------------------------|
          |                Setting                 |        JP3        |
          |----------------------------------------+-------------------|
          | » |    Receive level select normal     | Pins 1 & 2 Closed |
          |   |        (10Base-T standard)         |                   |
          |---+------------------------------------+-------------------|
          |   |   Receive level select low (non    | Pins 2 & 3 Closed |
          |   |         10Base-T network)          |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  TRANSCEIVER EQUALIZATION                  |
          |------------------------------------------------------------|
          |                 Setting                  |  JP4   |  JP5   |
          |------------------------------------------+--------+--------|
          | » |   Transmitter Equalization enabled   | Closed |  Open  |
          |   |         (10Base-T standard)          |        |        |
          |---+--------------------------------------+--------+--------|
          |   |  Receiver Equalization enabled (non  |  Open  | Closed |
          |   |          10Base-T network)           |        |        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   TWISTED PAIR IMPEDANCE                   |
          |------------------------------------------------------------|
          | Impedance |    JP6     |    JP7    |    JP8    |    JP9    |
          |-----------+------------+-----------+-----------+-----------|
          |   75ohm   | Pins 1 & 2 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |           |            |     2     |     2     |     2     |
          |-----------+------------+-----------+-----------+-----------|
          |  100ohm   | Pins 2 & 3 | Pins 2 &  | Pins 2 &  | Pins 2 &  |
          |           |            |     3     |     3     |     3     |
          |-----------+------------+-----------+-----------+-----------|
          |  150ohm   | Pins 3 & 4 | Pins 3 &  | Pins 3 &  | Pins 3 &  |
          |           |            |     4     |     4     |     4     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      BOOT ROM ADDRESS                      |
          |------------------------------------------------------------|
          | Address  |  JP10   |  JP11   |  JP12   |  JP13   |  JP14   |
          |----------+---------+---------+---------+---------+---------|
          | Disabled | Closed  |  Open   |  Open   |  Open   |  Open   |
          |----------+---------+---------+---------+---------+---------|
          |  C8000h  |  Open   |  Open   |  Open   |  Open   | Closed  |
          |----------+---------+---------+---------+---------+---------|
          |  CC000h  |  Open   |  Open   |  Open   | Closed  |  Open   |
          |----------+---------+---------+---------+---------+---------|
          |  D8000h  |  Open   |  Open   | Closed  |  Open   |  Open   |
          |----------+---------+---------+---------+---------+---------|
          |  DC000h  |  Open   | Closed  |  Open   |  Open   |  Open   |
          +------------------------------------------------------------+
       
          +---------------------------------------------------------------+
          |                       I/O BASE ADDRESS                        |
          |---------------------------------------------------------------|
          |Address| JP15 | JP16 | JP17 | JP18 | JP19 | JP20 | JP21 | JP22 |
          |-------+------+------+------+------+------+------+------+------|
          | 250h  | Open | Open | Open | Open |Closed| Open | Open | Open |
          |-------+------+------+------+------+------+------+------+------|
          | 280h  | Open | Open | Open | Open | Open |Closed| Open | Open |
          |-------+------+------+------+------+------+------+------+------|
          | 2A0h  | Open | Open | Open | Open | Open | Open |Closed| Open |
          |-------+------+------+------+------+------+------+------+------|
          | 2E0h  | Open | Open | Open | Open | Open | Open | Open |Closed|
          |-------+------+------+------+------+------+------+------+------|
          | 300h  |Closed| Open | Open | Open | Open | Open | Open | Open |
          |-------+------+------+------+------+------+------+------+------|
          | 310h  | Open |Closed| Open | Open | Open | Open | Open | Open |
          |-------+------+------+------+------+------+------+------+------|
          | 330h  | Open | Open |Closed| Open | Open | Open | Open | Open |
          |-------+------+------+------+------+------+------+------+------|
          | 350h  | Open | Open | Open |Closed| Open | Open | Open | Open |
          +---------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    LINK INTEGRITY TEST                     |
          |------------------------------------------------------------|
          |           Setting           |             JP23             |
          |-----------------------------+------------------------------|
          | »        |     Enabled      |      Pins 2 & 3 Closed       |
          |----------+------------------+------------------------------|
          |          |     Disabled     |      Pins 1 & 2 Closed       |
          |------------------------------------------------------------|
          | Note:Link Integrity is only used with 10Base-T wiring.     |
          | When using an AUI transciever, the test should be          |
          | disabled.                                                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  | Status  |                 Condition                 |
          |------+---------+-------------------------------------------|
          |  L1  |   On    |   Data is being transmitted or received   |
          |------+---------+-------------------------------------------|
          |  L1  |   Off   | Data is not being transmitted or received |
          |------+---------+-------------------------------------------|
          |  L2  |   On    |  Twisted pair network connection is good  |
          |------+---------+-------------------------------------------|
          |  L2  |   Off   | Twisted pair network connection is broken |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    MISCELLANEOUS NOTES                     |
          |------------------------------------------------------------|
          | The interrupt request and cable type are set using the     |
          | software that comes with the card.                         |
          +------------------------------------------------------------+