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

   TC6843 ARC-CARD/SE

   Card Type             Network Interface Card                   
   Chip Set              NCR 90C26                                
   NIC Type              ARCnet                                   
   Network Transfer Rate 2.5Mbps                                  
   Topology              Linear Bus, Star                         
   Wiring Type           RG-62A/U 93ohm coaxial                   
   Data Bus              16-bit Mac SE                            

<gopher://bitreich.org/I/th99/n/S-T/42030-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |   Function   | Label |          Function           | Label |
   |--------------+-------+-----------------------------+-------|
   | Header to    |  J1A  | RG-62A/U 93ohm coaxial      |  J2   |
   | transceiver  |       | connector                   |       |
   |--------------+-------+-----------------------------+-------|
   | Header to    |  J1B  |                             |       |
   | controller   |       |                             |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                EXTENDED RANGE CONFIGURATION                |
   |------------------------------------------------------------|
   |    Response Time     |  Recon Time  |    JP1    |   JP2    |
   |----------------------+--------------+-----------+----------|
   |>>   |    74.7 uS     |    840 mS    |   Open    |   Open   |
   |-----+----------------+--------------+-----------+----------|
   |     |    283.4 uS    |   1680 mS    |  Closed   |   Open   |
   |-----+----------------+--------------+-----------+----------|
   |     |    561.8 uS    |   1680 mS    |   Open    |  Closed  |
   |-----+----------------+--------------+-----------+----------|
   |     |   11118.6 uS   |   1680 mS    |  Closed   |  Closed  |
   |------------------------------------------------------------|
   | Note: This setting should only be changed when the length  |
   | of the ARCnet segments exceed 6000 meters.                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   NODE ADDRESS SELECTION                   |
   |------------------------------------------------------------|
   |Setting|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  |
   |-------+------+------+------+------+------+-----+-----+-----|
   |   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  |
   |-------+------+------+------+------+------+-----+-----+-----|
   |   5   | Off  |  On  | Off  |  On  |  On  | On  | On  | On  |
   |-------+------+------+------+------+------+-----+-----+-----|
   |  249  | Off  |  On  |  On  | Off  | Off  | Off | Off | Off |
   |-------+------+------+------+------+------+-----+-----+-----|
   |  250  |  On  | Off  |  On  | Off  | Off  | Off | Off | Off |
   |-------+------+------+------+------+------+-----+-----+-----|
   |  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 |
   |------------------------------------------------------------|
   |                           Note:                            |
   |                                                            |
   |A total of 253 node address settings are available. The     |
   |switches are a binary representation of the decimal memory  |
   |addresses. SW1/8 is the Most Significant Bit and switch     |
   |SW1/1 is the Least Significant Bit. The switches have the   |
   |following decimal values: SW1/8=128, SW1/7=64, SW1/6=32,    |
   |SW1/5=16, SW1/4=8, SW1/3=4, SW1/2=2, SW1/1=1. Turn off the  |
   |switches and add the values of the switches to obtain the   |
   |correct node address. (Off=1, On=0)                         |
   |                                                            |
   |Addresses 0, 254 and 255 are reserved and should not be     |
   |used.                                                       |
   +------------------------------------------------------------+