THOMAS-CONRAD CORPORATION

TC6142

NIC Type      ARCnet
Transfer Rate 2.5Mbps
Data Bus      8-bit ISA
Topology      Star

              Linear Bus
Wiring Type   RG62/U 93ohm coaxial
Boot ROM      Available

[Image]

                               NODE ADDRESS

  Node   SW2/1    SW2/2   SW2/3   SW2/4    SW2/5   SW2/6    SW2/7   SW2/8

   0       -       -        -       -       -        -       -        -

   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

  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     On      Off      Off     Off     Off      Off     Off      Off

  255     Off     Off      Off     Off     Off      Off     Off      Off

       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
       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)

                             INTERRUPT REQUEST

    IRQ          JP1         JP2          JP3         JP4          JP5

  »     2      Closed        Open        Open         Open        Open

        3       Open        Closed       Open         Open        Open

        4       Open         Open       Closed        Open        Open

        5       Open         Open        Open        Closed       Open

        7       Open         Open        Open         Open       Closed

            CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS

  Cable Length      Response     Reconfiguration       JP6         JP7
                     Time

  »    < 20,000      74.7µs           840ms            Open       Open
        feet

       > 20,000     283.4µs           1680ms          Closed      Open
        feet

       > 20,000     561.8µs           1680ms           Open      Closed
        feet

       > 20,000     1118.6µs          1680ms          Closed     Closed
        feet

  Note: All NICs on the network must have this option set the same.

                            BASE MEMORY ADDRESS

   Address       SW1/1     SW1/2     SW1/3     SW1/4     SW1/5     SW1/6

  »    D000h      Off       Off       On        Off       On        On

       C000h      Off       Off       On        On        On        On

       C400h      Off       Off       On        On        On        Off

       C800h      Off       Off       On        On        Off       On

       CC00h      Off       Off       On        On        Off       Off

       D400h      Off       Off       On        Off       On        Off

       D800h      Off       Off       On        Off       Off       On

       DC00h      Off       Off       On        Off       Off       Off

                            COMPATIBILITY MODE

                   Mode                                 SW1/8

  »              Enhanced mode                           On

                Compatible mode                          Off

  Note: Enhanced mode optimizes performance and minimizes conflicts of
  your hardware, by using a Thomas-Conrad ARCNET driver. It is also not
  necessary to set the I/O address. In most existing ARCNET drivers.

                             I/O BASE ADDRESS

   Address      SW3/3     SW3/4     SW3/5     SW3/6     SW3/7      SW3/8

  »    2E0h      Off       On        Off       Off       Off        On

       2F0h      Off       On        Off       Off       Off        Off

       300h      Off       Off        On        On        On        On

       310h      Off       Off        On        On        On        Off

       320h      Off       Off        On        On       Off        On

       330h      Off       Off        On        On       Off        Off

       340h      Off       Off        On       Off        On        On

       350h      Off       Off        On       Off        On        Off

       360h      Off       Off        On       Off       Off        On

       370h      Off       Off        On       Off       Off        Off

       380h      Off       Off       Off        On        On        On

       390h      Off       Off       Off        On        On        Off

       3A0h      Off       Off       Off        On       Off        On

       3B0h      Off       Off       Off        On       Off        Off

       3C0h      Off       Off       Off       Off        On        On

       3D0h      Off       Off       Off       Off        On        Off

       3E0h      Off       Off       Off       Off       Off        On

       3F0h      Off       Off       Off       Off       Off        Off

  FACTORY CONFIGURED SETTINGS - DO NOT ALTER

        Switch                 Setting

         SW1/7                  Unused

         SW3/1                  Unused

         SW3/2                  Unused