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                                     

<gopher://bitreich.org/I/th99/n/P-R/40023-1.png>
   

   +------------------------------------------------------------+
   |                    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.                                     |
   +------------------------------------------------------------+