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       # TIARA COMPUTER SYSTEMS, INC.
       
          LanCard/A * PC & LanCard/A * PC HiZ
       
          NIC Type         ARCnet                                        
          Transfer Rate    2.5Mbps                                       
          Data Bus         8-bit ISA                                     
          Topology         Star (PC)                                     
                                                                         
                           Linear Bus (PC HiZ)                           
          Wiring Type      RG-62A/U 93ohm coaxial (PC and PC HiZ)        
                                                                         
                           RG-58A/U 50ohm coaxial (HiZ only)             
          Boot ROM         Available                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        NODE ADDRESS                        |
          |------------------------------------------------------------|
          |Node |SW2/1 |SW2/2 |SW2/3 |SW2/4 |SW2/5 |SW2/6 |SW2/7 |SW2/8|
          |-----+------+------+------+------+------+------+------+-----|
          |  0  |  -   |  -   |  -   |  -   |  -   |  -   |  -   |  -  |
          |-----+------+------+------+------+------+------+------+-----|
          |  1  | Off  | Off  | Off  | Off  | Off  | Off  | Off  | On  |
          |-----+------+------+------+------+------+------+------+-----|
          |  2  | Off  | Off  | Off  | Off  | Off  | Off  |  On  | Off |
          |-----+------+------+------+------+------+------+------+-----|
          |  3  | Off  | Off  | Off  | Off  | Off  | Off  |  On  | On  |
          |-----+------+------+------+------+------+------+------+-----|
          |  4  | Off  | Off  | Off  | Off  | Off  |  On  | Off  | Off |
          |-----+------+------+------+------+------+------+------+-----|
          | 251 |  On  |  On  |  On  |  On  |  On  | Off  |  On  | On  |
          |-----+------+------+------+------+------+------+------+-----|
          | 252 |  On  |  On  |  On  |  On  |  On  |  On  | Off  | Off |
          |-----+------+------+------+------+------+------+------+-----|
          | 253 |  On  |  On  |  On  |  On  |  On  |  On  | Off  | On  |
          |-----+------+------+------+------+------+------+------+-----|
          | 254 |  On  |  On  |  On  |  On  |  On  |  On  |  On  | Off |
          |-----+------+------+------+------+------+------+------+-----|
          | 255 |  On  |  On  |  On  |  On  |  On  |  On  |  On  | On  |
          |------------------------------------------------------------|
          |Note: Node address 0 is used for messaging between nodes and|
          |must not be used.                                           |
          |                                                            |
          |  A total of 255 node address settings are available. The   |
          |  switches are a binary representation of the decimal node  |
          |  addresses. Switch 8 is the Least Significant Bit and      |
          |  switch 1 is the Most Significant Bit. The switches have   |
          |  the following decimal values: switch 8=1, 7=2, 6=4, 5=8,  |
          |  4=16, 3=32, 2=64, 1=128. Turn on the switches and add the |
          |  values of the on switches to obtain the correct node      |
          |  address. (On=1, Off=0)                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     INTERRUPT REQUEST                      |
          |------------------------------------------------------------|
          | IRQ  |  JP1   |  JP2   |  JP3   |  JP4   |  JP5   |  JP6   |
          |------+--------+--------+--------+--------+--------+--------|
          |  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 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                ENHANCED DIAGNOSTICS ENABLE                 |
          |------------------------------------------------------------|
          |           Setting            |             JP7             |
          |------------------------------+-----------------------------|
          | »         |     Disabled     |      Pins 1 & 2 closed      |
          |-----------+------------------+-----------------------------|
          |           |     Enabled      |      Pins 2 & 3 closed      |
          |------------------------------------------------------------|
          | Note: The enhanced diagnostics are compatible only with    |
          | the driver that was shipped with this card.                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      I/O BASE ADDRESS                      |
          |------------------------------------------------------------|
          |     Address     |    SW1/1     |    SW1/2    |    SW1/3    |
          |-----------------+--------------+-------------+-------------|
          | » |    2E0h     |     Off      |     On      |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    260h     |     Off      |     Off     |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    290h     |     Off      |     Off     |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    2B0h     |     Off      |     On      |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    300h     |      On      |     Off     |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    350h     |      On      |     Off     |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    380h     |      On      |     On      |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    3E0h     |      On      |     On      |     On      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              RIM BUFFER ADDRESS CONFIGURATION              |
          |------------------------------------------------------------|
          |     Buffer Address      |   SW1/4   |   SW1/5   |  SW1/6   |
          |-------------------------+-----------+-----------+----------|
          | »     |   D0OO-D3FFH    |    On     |    Off    |   Off    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   C0OO-C3FFH    |    Off    |    Off    |   Off    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   C4OO-C7FFH    |    Off    |    Off    |    On    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   CCOO-CFFFH    |    Off    |    On     |    On    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   D4OO-D7FFH    |    On     |    Off    |    On    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   D8OO-DBFFH    |    On     |    On     |   Off    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   DCOO-DFFFH    |    On     |    On     |    On    |
          |-------+-----------------+-----------+-----------+----------|
          |       |   E000-E3FFH    |    Off    |    On     |   Off    |
          |------------------------------------------------------------|
          |   Note: The lower 8K of the address above is used as a     |
          |   network data buffer. The upper 8K is where the Boot ROM  |
          |   is loaded into system memory.                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |     CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS     |
          |------------------------------------------------------------|
          |   Maximum   | Response  | Reconfiguration  | SW1/7 | SW1/8 |
          |   Length    |   Time    |                  |       |       |
          |-------------+-----------+------------------+-------+-------|
          | »  |  4.8   |  74.7µs   |      840ms       |  On   |  On   |
          |    | miles  |           |                  |       |       |
          |----+--------+-----------+------------------+-------+-------|
          |    |  21.0  |  283.4µs  |      1680ms      |  On   |  Off  |
          |    | miles  |           |                  |       |       |
          |----+--------+-----------+------------------+-------+-------|
          |    |  42.5  |  561.8µs  |      1680ms      |  Off  |  On   |
          |    | miles  |           |                  |       |       |
          |----+--------+-----------+------------------+-------+-------|
          |    |  85.6  | 1118.6µs  |      1680ms      |  Off  |  Off  |
          |    | miles  |           |                  |       |       |
          |------------------------------------------------------------|
          | Note: Maximum length is the distance between the two       |
          | farthest cards on the network. All cards on a segment must |
          | have this option set the same.                             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          |  LED  |  Color  |   Status   |          Condition          |
          |-------+---------+------------+-----------------------------|
          |  L1   |   Red   |     On     |   Data is being received    |
          |-------+---------+------------+-----------------------------|
          |  L1   |   Red   |    Off     | Data is not being received  |
          |-------+---------+------------+-----------------------------|
          |  L1   |   Red   |  Blinking  |    Card is reconfiguring    |
          |-------+---------+------------+-----------------------------|
          |  L2   |  Green  |     On     |  Data is being transmitted  |
          |-------+---------+------------+-----------------------------|
          |  L2   |  Green  |    Off     |      Data is not being      |
          |       |         |            |         transmitted         |
          |-------+---------+------------+-----------------------------|
          |  L2   |  Green  |  Blinking  |    Card is reconfiguring    |
          |------------------------------------------------------------|
          |   Note: If LEDs L1 & L2 continue to blink for an extended  |
          |   amount of time, this indicates a network problem such as |
          |   a defective card, a broken network connection, or a hub  |
          |   failure.                                                 |
          +------------------------------------------------------------+