TIARA COMPUTER SYSTEMS, INC.

LanCard/A * PC & LanCard/A * PC HiZ

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

              Linear Bus (PC HiZ)
Wiring Type   RG-62A/U 93ohm coaxial (PC and PC HiZ)

              RG-58A/U 50ohm coaxial (HiZ only)
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     Off      Off     Off     Off      Off     Off      On

   2      Off     Off      Off     Off     Off      Off      On      Off

   3      Off     Off      Off     Off     Off      Off      On      On

   4      Off     Off      Off     Off     Off      On      Off      Off

  251     On       On      On      On       On      Off      On      On

  252     On       On      On      On       On      On      Off      Off

  253     On       On      On      On       On      On      Off      On

  254     On       On      On      On       On      On       On      Off

  255     On       On      On      On       On      On       On      On

  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
       8 is the Least Significant Bit and switch 1 is the Most
       Significant Bit. The switches have the following decimal values:
       switch 8=1, 7=2, 6=4, 5=8, 4=16, 3=32, 2=64, 1=128. Turn on the
       switches and add the values of the on switches to obtain the
       correct node address. (On=1, Off=0)

                         INTERRUPT REQUEST

   IRQ       JP1       JP2       JP3      JP4       JP5       JP6

    2       Closed     Open     Open      Open     Open      Open

    3        Open     Closed    Open      Open     Open      Open

    4        Open      Open     Closed    Open     Open      Open

    5        Open      Open     Open     Closed    Open      Open

    6        Open      Open     Open      Open     Closed    Open

    7        Open      Open     Open      Open     Open      Closed

                        ENHANCED DIAGNOSTICS ENABLE

                 Setting                                JP7

  »                Disabled                      Pins 1 & 2 closed

                   Enabled                       Pins 2 & 3 closed

  Note: The enhanced diagnostics are compatible only with the driver that
  was shipped with this card.

                             I/O BASE ADDRESS

       Address              SW1/1             SW1/2            SW1/3

  »        2E0h              Off                On              Off

           260h              Off               Off              Off

           290h              Off               Off               On

           2B0h              Off                On               On

           300h               On               Off              Off

           350h               On               Off               On

           380h               On                On               On

           3E0h               On                On               On

                     RIM BUFFER ADDRESS CONFIGURATION

      Buffer Address            SW1/4           SW1/5           SW1/6

  »       D0OO-D3FFH             On              Off             Off

          C0OO-C3FFH             Off             Off             Off

          C4OO-C7FFH             Off             Off             On

          CCOO-CFFFH             Off             On              On

          D4OO-D7FFH             On              Off             On

          D8OO-DBFFH             On              On              Off

          DCOO-DFFFH             On              On              On

          E000-E3FFH             Off             On              Off

       Note: The lower 8K of the address above is used as a network data
       buffer. The upper 8K is where the Boot ROM is loaded into system
       memory.

            CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS

     Maximum        Response      Reconfiguration      SW1/7      SW1/8
     Length           Time

  »   4.8 miles      74.7µs            840ms             On         On

         21.0        283.4µs          1680ms             On        Off
        miles

         42.5        561.8µs          1680ms            Off         On
        miles

         85.6       1118.6µs          1680ms            Off        Off
        miles

  Note: Maximum length is the distance between the two farthest cards on
  the network. All cards on a segment must have this option set the same.

                             DIAGNOSTIC LED(S)

    LED        Color          Status                 Condition

    L1          Red             On             Data is being received

    L1          Red            Off           Data is not being received

    L1          Red          Blinking          Card is reconfiguring

    L2         Green            On           Data is being transmitted

    L2         Green           Off         Data is not being transmitted

    L2         Green         Blinking          Card is reconfiguring

       Note: If LEDs L1 & L2 continue to blink for an extended amount of
       time, this indicates a network problem such as a defective card, a
       broken network connection, or a hub failure.