
STANDARD MICROSYSTEMS CORPORATION

ARCnet PC270E

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:Note 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       JP1D       JP1E       JP1F       JP1G       JP1H

     2        Open       Open       Open       Open      Closed

     3        Open       Open       Open      Closed      Open

     4        Open       Open      Closed      Open       Open

     5        Open      Closed      Open       Open       Open

     7       Closed      Open       Open       Open       Open

                  BASE MEMORY ADDRESS & BOOT ROM ADDRESS

  Base Address     Boot ROM    SW2/1    SW2/2    SW2/3    SW2/4    SW2/5
                   Address

      D0000 -     D2000 -      On       Off      Off      On       On
       D07FFh      D3FFFh

       C0000 -     C2000 -      On       On       On       On       On
       C07FFh      C3FFFh

       C0800 -     C2000 -      On       On       On       On       Off
       C0FFFh      C3FFFh

       C1000 -     C2000 -      On       On       On       Off      On
       C17FFh      C3FFFh

       C1800 -     C2000 -      On       On       On       Off      Off
       C1FFFh      C3FFFh

       C4000 -     C6000 -      On       On       Off      On       On
       C47FFh      C7FFFh

       C4800 -     C6000 -      On       On       Off      On       Off
       C4FFFh      C7FFFh

       C5000 -     C6000 -      On       On       Off      Off      On
       C57FFh      C7FFFh

       C5800 -     C6000 -      On       On       Off      Off      Off
       C5FFFh      C7FFFh

       CC000 -     CE000 -      On       Off      On       On       On
       CC7FFh      CFFFFh

       CC800 -     CE000 -      On       Off      On       On       Off
       CCFFFh      CFFFFh

       CD000 -     CE000 -      On       Off      On       Off      On
       CD7FFh      CFFFFh

       CD800 -     CE000 -      On       Off      On       Off      Off
       CDFFFh      CFFFFh

       D0800 -     D2000 -      On       Off      Off      On       Off
       D0FFFh      D3FFFh

       D1000 -     D2000 -      On       Off      Off      Off      On
       D17FFh      D3FFFh

       D1800 -     D2000 -      On       Off      Off      Off      Off
       D1FFFh      D3FFFh

       D4000 -     D6000 -      Off      On       On       On       On
       D47FFh      D7FFFh

       D4800 -     D6000 -      Off      On       On       On       Off
       D4FFFh      D7FFFh

       D5000 -     D6000 -      Off      On       On       Off      On
       D57FFh      D7FFFh

       D5800 -     D6000 -      Off      On       On       Off      Off
       D5FFFh      D7FFFh

       D8000 -     DA000 -      Off      On       Off      On       On
       D87FFh      DBFFFh

       D8800 -     DA000 -      Off      On       Off      On       Off
       D8FFFh      DBFFFh

       D9000 -     DA000 -      Off      On       Off      Off      On
       D97FFh      DBFFFh

       D9800 -     DA000 -      Off      On       Off      Off      Off
       D9FFFh      DBFFFh

       DC000 -     DE000 -      Off      Off      On       On       On
       DC7FFh      DFFFFh

       DC800 -     DE000 -      Off      Off      On       On       Off
       DCFFFh      DFFFFh

       DD000 -     DE000 -      Off      Off      On       Off      On
       DD7FFh      DFFFFh

       DD800 -     DE000 -      Off      Off      On       Off      Off
       DDFFFh      DFFFFh

       E0000 -     E2000 -      Off      Off      Off      On       On
       E07FFh      E2FFFh

       E0800 -     E2000 -      Off      Off      Off      On       Off
       E0FFFh      E2FFFh

       E1000 -     E2000 -      Off      Off      Off      Off      On
       E17FFh      E2FFFh

       E1800 -     E2000 -      Off      Off      Off      Off      Off
       E1FFFh      E2FFFh

                   RESPONSE AND RECONFIGURATION TIMEOUTS

  Response Time   Idle Time    Reconfig. Time      JP1A          JP1B

       78 m         86 m          840 m          Closed        Closed

        285 m       316 m          1680 m          Open         Closed

        563 m       624 m          1680 m         Closed         Open

       1190 m       1237 m         1680 m          Open          Open

                                 BOOT ROM

                 Setting                               JP1C

                 Disabled                             Open

                   Enabled                            Closed

             I/O BASE ADDRESS

  Address    SW1/1      SW1/2      SW1/3

   260h        On         On        On

   290h        On         On        Off

   2E0h        On        Off        On

   2F0h        On        Off        Off

   300h       Off         On        On

   350h       Off         On        Off

   380h       Off        Off        On

   3E0h       Off        Off        Off

                             DIAGNOSTIC LED(S)

    LED         Color          Status                 Condition

    LED1         Red        On/Blinking      Data is being transmitted or
                                                      receiving

    LED1         Red            Off         Data is not being transmitted
                                                    or receiving

    LED2        Green            On         Card is configured correctly

    LED2        Green         Blinking          Card is reconfiguring

    LED2        Green           Off            Card is defective or not
                                                configured correctly

