
TOP MICROSYSTEMS, INC.

TOP/ARC-30 TWISTED PAIR

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

              Linear bus
Wiring Type   Unshielded twisted pair
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)

            CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS

  Cable Length      Response       Reconfiguration       JP1       JP2
                      Time              Time

      < 20,000      74.7s            840ms            Open       Open
        feet

       > 20,000      283.4s           1680ms          Closed      Open
        feet

       > 20,000      561.8s           1680ms           Open      Closed
        feet

       > 20,000     1118.6s           1680ms          Closed     Closed
        feet

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

                                 BOOT ROM

                 Setting                                JP3

                  Disabled                             Open

                   Enabled                             Closed

  Note:A 2732 or 2764 boot ROM may be used in the boot ROM socket. If a
  2732 is used, the chip must be

                             INTERRUPT REQUEST

    IRQ          JP4         JP5          JP6         JP7          JP8

       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

                             I/O BASE ADDRESS

         Address              SW1/1            SW1/2            SW1/3

          260-26Fh              On               On              On

          290-29Fh              On               On              Off

         2E0-2EFh              On              Off              On

          2F0-2FFh              On              Off              Off

          300-30Fh             Off               On              On

          350-35Fh             Off               On              Off

          380-38Fh             Off              Off              On

          3E0-3EFh             Off              Off              Off

                BASE MEMORY ADDRESS &AMP; BOOT ROM ADDRESS

  Base Address   Boot ROM    SW1/4    SW1/5     SW1/6    SW1/7     SW1/8

       C0000h     C2000h      On        On       On        On       On

       C0800h     C2000h      On        On       On        On       Off

       C1000h     C2000h      On        On       On       Off       On

       C1800h     C2000h      On        On       On       Off       Off

       C4000h     C6000h      On        On       Off       On       On

       C4800h     C6000h      On        On       Off       On       Off

       C5000h     C6000h      On        On       Off      Off       On

       C5800h     C6000h      On        On       Off      Off       Off

       CC000h     CE000h      On       Off       On        On       On

       CC800h     CE000h      On       Off       On        On       Off

       CD000h     CE000h      On       Off       On       Off       On

       CD800h     CE000h      On       Off       On       Off       Off

      D0000h     D2000h      On       Off       Off       On       On

       D0800h     D2000h      On       Off       Off       On       Off

       D1000h     D2000h      On       Off       Off      Off       On

       D1800h     D2000h      On       Off       Off      Off       Off

       D4000h     D6000h      Off       On       On        On       On

       D4800h     D6000h      Off       On       On        On       Off

       D5000h     D6000h      Off       On       On       Off       On

       D5800h     D6000h      Off       On       On       Off       Off

       D8000h     DA000h      Off       On       Off       On       On

       D8800h     DA000h      Off       On       Off       On       Off

       D9000h     DA000h      Off       On       Off      Off       On

       D9800h     DA000h      Off       On       Off      Off       Off

       DC000h     DE000h      Off      Off       On        On       On

       DC800h     DE000h      Off      Off       On        On       Off

       DD000h     DE000h      Off      Off       On       Off       On

       DD800h     DE000h      Off      Off       On       Off       Off

       E0000h     E2000h      Off      Off       Off       On       On

       E0800h     E2000h      Off      Off       Off       On       Off

       E1000h     E2000h      Off      Off       Off      Off       On

       E1800h     E2000h      Off      Off       Off      Off       Off

                            MISCELLANEOUS NOTES

  This card may be used in a star topology by terminating one of the
  RJ-11 jacks.

