THOMAS-CONRAD CORPORATION
=========================

   TC6842 (FOR THE MACINTOSH)

   NIC Type         ARCnet                                        
   Transfer Rate    2.5Mbps                                       
   Data Bus         32-Bit NuBus                                  
   Topology         Star                                          
   Wiring Type      RG62/U 93ohm coaxial                          
   Boot ROM         Not Available                                 

<gopher://bitreich.org/I/th99/n/S-T/40117-1.png>
   

   +------------------------------------------------------------+
   |                        NODE ADDRESS                        |
   |------------------------------------------------------------|
   | Node  |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6|SW1/7|SW1/8|
   |-------+------+------+------+------+------+-----+-----+-----|
   |>> | 1  | Off  |  On  |  On  |  On  |  On  | On  | On  | On  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  | 0  |  -   |  -   |  -   |  -   |  -   |  -  |  -  |  -  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  | 2  |  On  | Off  |  On  |  On  |  On  | On  | On  | On  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  | 3  | Off  | Off  |  On  |  On  |  On  | On  | On  | On  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  | 4  |  On  |  On  | Off  |  On  |  On  | On  | On  | On  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  |251 | Off  | Off  |  On  | Off  | Off  | Off | Off | Off |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  |252 |  On  |  On  | Off  | Off  | Off  | Off | Off | Off |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  |253 | Off  |  On  | Off  | Off  | Off  | Off | Off | Off |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  |254 |  -   |  -   |  -   |  -   |  -   |  -  |  -  |  -  |
   |--+----+------+------+------+------+------+-----+-----+-----|
   |  |255 |  -   |  -   |  -   |  -   |  -   |  -  |  -  |  -  |
   |------------------------------------------------------------|
   |  Note:Node address 0 is used for messaging between nodes   |
   |  and must not be used. Node addresses 254 &255 are reserved|
   |  for AppleTalk network broadcast messages and also must not|
   |  be used.                                                  |
   |                                                            |
   |  A total of 253 node address settings are available. The   |
   |  switches are a binary representation of the decimal node  |
   |  addresses. Switch 1 is the Least Significant Bit and      |
   |  switch 8 is the Most Significant Bit. The switches have   |
   |  the following decimal values: switch 1=1, 2=2, 3=4, 4=8,  |
   |  5=16, 6=32, 7=64, 8=128. Turn off the switches and add the|
   |  values of the off switches to obtain the correct node     |
   |  address. (On=0, Off=1)                                    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |     CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS     |
   |------------------------------------------------------------|
   |    Cable    | Response | Reconfiguration |  JP1   |  JP2   |
   |   Length    |   Time   |                 |        |        |
   |-------------+----------+-----------------+--------+--------|
   |>> |    <    | 74.7 m s |      840ms      |  Open  |  Open  |
   |   | 20,000  |          |                 |        |        |
   |   |  feet   |          |                 |        |        |
   |---+---------+----------+-----------------+--------+--------|
   |   |    >    | 283.4 m  |     1680ms      | Closed |  Open  |
   |   | 20,000  |    s     |                 |        |        |
   |   |  feet   |          |                 |        |        |
   |---+---------+----------+-----------------+--------+--------|
   |   |    >    | 561.8 m  |     1680ms      |  Open  | Closed |
   |   | 20,000  |    s     |                 |        |        |
   |   |  feet   |          |                 |        |        |
   |---+---------+----------+-----------------+--------+--------|
   |   |    >    | 1118.6 m |     1680ms      | Closed | Closed |
   |   | 20,000  |    s     |                 |        |        |
   |   |  feet   |          |                 |        |        |
   |------------------------------------------------------------|
   | Note: All NICs on the network must have this option set    |
   | the same.                                                  |
   +------------------------------------------------------------+