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       # 3COM CORPORATION
       
          ETHERLINK (3C501; ASSY.#1221)
       
          NIC Type         Ethernet                                      
          Transfer Rate    10Mbps                                        
          Data Bus         8-bit ISA                                     
          Topology         Linear Bus                                    
          Wiring Type      RG-58A/U 50ohm coaxial                        
                                                                         
                           AUI transceiver via DB-15 port                
          Boot ROM         Available                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                    CABLE TYPE SELECTION                    |
          |------------------------------------------------------------|
          |                Type                |        Setting        |
          |------------------------------------+-----------------------|
          | » |     RG-58A/U 50ohm coaxial     |       Option 1        |
          |---+--------------------------------+-----------------------|
          |   | AUI transceiver via DB-15 port |       Option 2        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   BOOT ROM CONFIGURATION                   |
          |------------------------------------------------------------|
          |          Setting           |              JP3              |
          |----------------------------+-------------------------------|
          | » |        Disabled        |       Pins 2 & 3 Closed       |
          |---+------------------------+-------------------------------|
          |   |        Enabled         |       Pins 1 & 2 Closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 I/O BASE ADDRESS SELECTION                 |
          |------------------------------------------------------------|
          | Address |  JP4   |  JP5   |  JP6   |  JP7  |  JP8  |  JP9  |
          |---------+--------+--------+--------+-------+-------+-------|
          |  300h   | Pins 2 | Pins 2 | Pins 2 | Pins  | Pins  | Pins  |
          |         |  & 3   |  & 3   |  & 3   | 2 & 3 | 1 & 2 | 1 & 2 |
          |---------+--------+--------+--------+-------+-------+-------|
          |  310h   | Pins 1 | Pins 2 | Pins 2 | Pins  | Pins  | Pins  |
          |         |  & 2   |  & 3   |  & 3   | 2 & 3 | 1 & 2 | 1 & 2 |
          |------------------------------------------------------------|
          | Note:Pins designated should be in the closed position.     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 BOOT ROM ADDRESS SELECTION                 |
          |------------------------------------------------------------|
          |Address| JP12 | JP13 | JP14 | JP15 | JP16 |JP17 |JP18 |JP19 |
          |-------+------+------+------+------+------+-----+-----+-----|
          |CC000h | Pins | Pins | Pins | Pins | Pins |Pins |Pins |Pins |
          |       | 2&3  | 2&3  | 1&2  | 1&2  | 2&3  | 2&3 | 1&2 | 1&2 |
          |-------+------+------+------+------+------+-----+-----+-----|
          |EC000h | Pins | Pins | Pins | Pins | Pins |Pins |Pins |Pins |
          |       | 2&3  | 2&3  | 1&2  | 1&2  | 2&3  | 1&2 | 1&2 | 1&2 |
          |------------------------------------------------------------|
          |Note:Pins designated should be in the closed position.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                INTERRUPT REQUEST SELECTION                 |
          |------------------------------------------------------------|
          | IRQ  |  JP20  |  JP21  |  JP22  |  JP23  |  JP24  |  JP25  |
          |------+--------+--------+--------+--------+--------+--------|
          |  2   | Closed |  Open  |  Open  |  Open  |  Open  |  Open  |
          |------+--------+--------+--------+--------+--------+--------|
          |  3   |  Open  | Closed |  Open  |  Open  |  Open  |  Open  |
          |------+--------+--------+--------+--------+--------+--------|
          |  4   |  Open  |  Open  | Closed |  Open  |  Open  |  Open  |
          |------+--------+--------+--------+--------+--------+--------|
          |  5   |  Open  |  Open  |  Open  | Closed |  Open  |  Open  |
          |------+--------+--------+--------+--------+--------+--------|
          |  6   |  Open  |  Open  |  Open  |  Open  | Closed |  Open  |
          |------+--------+--------+--------+--------+--------+--------|
          |  7   |  Open  |  Open  |  Open  |  Open  |  Open  | Closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   DMA CHANNEL SELECTION                    |
          |------------------------------------------------------------|
          |  Channel  |  JP26  | JP27  | JP28  | JP29  | JP30  | JP31  |
          |-----------+--------+-------+-------+-------+-------+-------|
          |   DMA1    | Closed | Open  | Open  |Closed | Open  | Open  |
          |-----------+--------+-------+-------+-------+-------+-------|
          |   DMA2    |  Open  |Closed | Open  | Open  |Closed | Open  |
          |-----------+--------+-------+-------+-------+-------+-------|
          |   DMA3    |  Open  | Open  |Closed | Open  | Open  |Closed |
          |------------------------------------------------------------|
          |Note:Setting the DMA Channel on this card is required even  |
          |though "No Channel" is listed when setting up the LAN       |
          |configuration software.                                     |
          +------------------------------------------------------------+