
STANDARD MICROSYSTEMS CORPORATION

ARCNET T250

NIC Type          ARCnet
Transfer Rate     2.5Mbps
Data Bus          Toshiba laptop internal expansion slot

                  (T5100, T3100, T3100e, T1600, T1200, and T1100Plus)
Topology          Star
Wiring Type       Unshielded twisted pair
Boot ROM          Not 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)

                      BASE MEMORY ADDRESS

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

  C0000h       On        On         On         On        On

  C0800h       On        On         On         On       Off

  C1000h       On        On         On        Off        On

  C1800h       On        On         On        Off       Off

  C4000h       On        On        Off         On        On

  C4800h       On        On        Off         On       Off

  C5000h       On        On        Off        Off        On

  C5800h       On        On        Off        Off       Off

  CC000h       On        Off        On         On        On

  CC800h       On        Off        On         On       Off

  CD000h       On        Off        On        Off        On

  CD800h       On        Off        On        Off       Off

  D0000h       On        Off       Off         On        On

  D0800h       On        Off       Off         On       Off

  D1000h       On        Off       Off        Off        On

  D1800h       On        Off       Off        Off       Off

  D4000h      Off        On         On         On        On

  D4800h      Off        On         On         On       Off

  D5000h      Off        On         On        Off        On

  D5800h      Off        On         On        Off       Off

  D8000h      Off        On        Off         On        On

  D8800h      Off        On        Off         On       Off

  D9000h      Off        On        Off        Off        On

  D9800h      Off        On        Off        Off       Off

  DC000h      Off        Off        On         On        On

  DC800h      Off        Off        On         On       Off

  DD000h      Off        Off        On        Off        On

  DD800h      Off        Off        On        Off       Off

  E0000h      Off        Off       Off         On        On

  E0800h      Off        Off       Off         On       Off

  E1000h      Off        Off       Off        Off        On

  E1800h      Off        Off       Off        Off       Off

                             I/O BASE ADDRESS

       Address              SW1/6             SW1/7            SW1/8

           260h               On                On               On

           290h              Off                On               On

           2E0h               On               Off               On

           2F0h              Off               Off               On

          300h               On                On              Off

           350h              Off                On              Off

           380h               On               Off              Off

           3E0h              Off               Off              Off

                               STANDBY MODE

                Mode                                 SW3

    Power is supplied to the card              On (position 1)

  Power is not supplied to the card            Off (position 0)

           INTERRUPT REQUEST

   IRQ      JP1A      JP1B      JP1C

    2      Closed     Open      Open

    3       Open     Closed     Open

    5       Open      Open     Closed

                  RESPONSE &AMP; RECONFIGURATION TIMEOUTS

  Response Time     Idle      Reconfig.      JP2A        JP2B      JP2C
                   Time         Time

       78s       86s         840ms       Closed      Closed     Open

       285s       316s       1680ms       Closed       Open      Open

       563s       624s       1680ms        Open       Closed     Open

       1190s     1237s       1680ms        Open        Open      Open

