
ALLOY COMPUTER PRODUCTS, INC.

EARTHNET-1

NIC Type      Arcnet
Transfer Rate 2.5Mbps
Data Bus      8-bit ISA
Topology      Star
Wiring Type   RG-62A/U 93ohm coaxial
Boot ROM      Available

[Image]

                          NODE ADDRESS SELECTION

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

    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

   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: A total of 255 node address settings are available. The
       switches are a binary representation of the decimal node
       addresses. switch SW2/1 is the Least Significant Bit and jumper
       SW2/8 is the Most Significant Bit. The switches have the following
       decimal values: jumper SW2/1=1, SW2/2=2, SW2/3=4, SW2/4=8,
       SW2/5=16, SW2/6=32, SW2/7=64, SW2/8=128.Open the switches and add
       the values of the open jumpers to obtain the correct node address.
       (On=0, Off=1)

                        BASE I/O ADDRESS SELECTION

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

      2E0h      Off       Off       Off       Off       Off        On

       200h      Off       On        On         On        On        On

       210h      Off       On        On         On        On        Off

       220h      Off       On        On         On       Off        On

       230h      Off       On        On         On       Off        Off

       240h      Off       On        On        Off        On        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

  Note: Addresses from 0h to 3F0h are possible, but those below 200h are
  not normally used. The sum of SW1/1 and SW1/2 represent the first
  digit. The sum of SW1/3-6 represent the second digit. The last digit is
  always zero. SW1/1=200h, SW1/2=100h, SW1/3=80h, SW1/4=40h, SW1/5=20h,
  SW/6=10h.

                            INTERRUPT SELECTION

    IRQ         JP2/1       JP2/2        JP2/3       JP2/4        JP2/5

       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

                             SHARED RAM ADDRESS

  Address   SW1/7  SW1/8   SW1/9   SW1/10   JP1/1   JP1/2   JP1/3    JP1/4

  A0000h    Off     On      Off      On     Open    Open    Open     Open

  A4000h    Off     On      Off      On     Open    Open    Closed   Open

  A8000h    Off     On      Off      On     Open    Open    Open     Closed

  B0000h    Off     On      Off     Off     Open    Open    Open     Open

  B4000h    Off     On      Off     Off     Open    Open    Closed   Open

  B8000h    Off     On      Off     Off     Open    Open    Open     Closed

  C0000h    Off     Off     On       On     Open    Open    Open     Open

  C4000h    Off     Off     On       On     Open    Open    Closed   Open

  C8000h    Off     Off     On       On     Open    Open    Open     Closed

  D0000h    Off     Off     On      Off     Open    Open    Open     Open

  D4000h    Off     Off     On      Off     Open    Open    Closed   Open

  D8000h    Off     Off     On      Off     Open    Open    Open     Closed

  E0000h    Off     Off     Off      On     Open    Open    Open     Open

  E4000h    Off     Off     Off      On     Open    Open    Closed   Open

  E8000h    Off     Off     Off      On     Open    Open    Open     Closed

                             DIAGNOSTIC LED(S)

    LED          Color          Status               Condition

   LED1       Unidentified        On                Data is being
                                                transmitted/received

   LED1       Unidentified        Off             Data is not being
                                                transmitted/received

   LED2       Unidentified        On         Network connection is good

   LED2       Unidentified        Off       Network connection is broken

  Note: Continuous pulsing of LED2 indicates network error or node
  address conflict.

