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# STANDARD MICROSYSTEMS CORPORATION
ARCNET PC250
NIC Type Arcnet
Chipset SMC 9026, 9032
Network Transfer Rate 2.5Mbps
Data Bus 8-bit ISA
Topology Linear Bus/Star
Wire Type Unshielded twisted pair
Boot ROM Available
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-----------------------+-------+--------------------+-------|
| Unshielded twisted | J1 | Unshielded twisted | J2 |
| pair connector | | pair connector | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT |
|------------------------------------------------------------|
| Setting | JP3 | JP4 | JP5 | JP6 | JP7 |
|----------+---------+---------+---------+---------+---------|
| IRQ2 | Closed | Open | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| IRQ3 | Open | Closed | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| IRQ4 | Open | Open | Closed | Open | Open |
|----------+---------+---------+---------+---------+---------|
| IRQ5 | Open | Open | Open | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| IRQ7 | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RANGE CONFIGURATION |
|------------------------------------------------------------|
| Response Time | Recon Time | JP1 | JP2 |
|-------------------+------------------+----------+----------|
| » | 75.7 uS | 840 mS | Open | Open |
|-----+-------------+------------------+----------+----------|
| | 283.4 uS | 1.68 S | Closed | Open |
|-----+-------------+------------------+----------+----------|
| | 561.8 uS | 1.68 S | Open | Closed |
|-----+-------------+------------------+----------+----------|
| | 1.1186 mS | 1.68 S | Closed | Closed |
|------------------------------------------------------------|
| Note:This setting should only be changed when the |
| length of the ArcNet segments exceed 6000 meters. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NODE ADDRESS |
|------------------------------------------------------------|
|Setting|SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6|SW1/7|SW1/8|
|-------+------+------+------+------+------+-----+-----+-----|
| 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 |
|-------+------+------+------+------+------+-----+-----+-----|
| 250 | On | Off | On | Off | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 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 |
|------------------------------------------------------------|
| Note: A total of 254 node address settings are |
| available. The switches are a binary representation of |
| the decimal node addresses. SW1/8 is the Most |
| Significant Bit and switch SW1/1 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW1/8=128, SW1/7=64, SW1/6=32, |
| SW1/5=16, SW1/4=8, SW1/3=4, SW1/2=2, SW1/1=1. Turn off |
| the switches and add the values of the switches that |
| are off to obtain the correct node ID. (Off=1, On=0) |
| |
| Node addresses 0 and 255 are reserved and should not be|
| used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS |
|------------------------------------------------------------|
| Setting | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|-----------+--------+-------+-------+-------+-------+-------|
| | 000h | On | On | On | On | On | On |
|---+-------+--------+-------+-------+-------+-------+-------|
| | 010h | On | On | On | On | On | Off |
|---+-------+--------+-------+-------+-------+-------+-------|
| | 020h | On | On | On | On | Off | On |
|---+-------+--------+-------+-------+-------+-------+-------|
| | 030h | On | On | On | On | Off | Off |
|---+-------+--------+-------+-------+-------+-------+-------|
| | 040h | On | On | On | Off | On | On |
|---+-------+--------+-------+-------+-------+-------+-------|
| » | 2E0h | Off | On | Off | Off | Off | 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: A total of 64 base address settings are |
| available. The switches are a binary representation |
| of the decimal memory addresses. SW1/1 is the Most |
| Significant Bit and switch SW1/6 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW1/1=512, SW1/2=256, SW1/3=128, |
| SW1/4=64, SW1/5=32, SW1/6=16. Turn off the switches |
| and add the values of the switches that are off to |
| obtain the correct memory address. (Off=1, On=0) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SHARED RAM ADDRESS |
|------------------------------------------------------------|
| Setting | SW2/7 | SW2/8 | SW2/9 | SW2/10 |
|------------+-----------+-----------+-----------+-----------|
| 00000h | Off | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 10000h | Off | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 20000h | Off | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 30000h | Off | Off | On | On |
|------------+-----------+-----------+-----------+-----------|
| 40000h | Off | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 50000h | Off | On | Off | On |
|------------+-----------+-----------+-----------+-----------|
| 60000h | Off | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 70000h | Off | On | On | On |
|------------+-----------+-----------+-----------+-----------|
| 80000h | On | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 90000h | On | Off | Off | On |
|------------+-----------+-----------+-----------+-----------|
| A0000h | On | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| B0000h | On | Off | On | On |
|------------+-----------+-----------+-----------+-----------|
| C0000h | On | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| D0000h | On | On | Off | On |
|------------+-----------+-----------+-----------+-----------|
| E0000h | On | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| F0000h | On | On | On | On |
+------------------------------------------------------------+