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# STANDARD MICROSYSTEMS CORPORATION
ARCNET PC220
NIC Type ARCnet
Network Transfer Rate 2.5Mbps
Data Bus 16-bit ISA
Topology Linear Bus
Wiring Type RG-62A/U 93ohm coaxial
Boot ROM Available
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label |
|-------------------------------+----------------------------|
| RG-62A/U 93ohm coaxial port | J1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------------+-------+-----------|
| » | Factory configured - do not alter | EXT | Open |
|---+------------------------------------+-------+-----------|
| » | Boot ROM enabled | ROM | Closed |
|---+------------------------------------+-------+-----------|
| | Boot ROM disabled | ROM | Open |
|------------------------------------------------------------|
| Note: Jumper EXT is used to configure the network time-out |
| settings, these two jumpers are normally left open, |
| however for additional settings refer to the COM 9026 Data |
| Sheet. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NODE ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | S1/1 | S1/2 | S1/3 |S1/4 |S1/5 |S1/6 |S1/7 |S1/8 |
|---------+------+------+------+-----+-----+-----+-----+-----|
| 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 memory 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 to |
| obtain the correct node address. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | S2/6 | S2/5 | S2/4 | S2/3 | S2/2 | S2/1 |
|------------+-------+-------+-------+-------+-------+-------|
| 0h | On | On | On | On | On | On |
|------------+-------+-------+-------+-------+-------+-------|
| 10h | On | On | On | On | On | Off |
|------------+-------+-------+-------+-------+-------+-------|
| 20h | On | On | On | On | Off | On |
|------------+-------+-------+-------+-------+-------+-------|
| 30h | On | On | On | On | Off | Off |
|------------+-------+-------+-------+-------+-------+-------|
| 40h | On | 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: A total of 64 Base I/O address settings are |
| available. The switches are a binary representation |
| of the decimal memory addresses. SW2/1 is the Most |
| Significant Bit and switch SW2/6 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW2/1=512, SW2/2=256, SW2/3=128, |
| SW2/4=64, SW2/5=32, SW2/6=16. Turn off the switches |
| and add the values of the switches to obtain the |
| correct node address. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | IRQ/A | IRQ/B | IRQ/C | IRQ/D | IRQ/E |
|-------+----------+----------+----------+---------+---------|
| 2/9 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE MEMORY ADDRESS SELECTION |
|------------------------------------------------------------|
|Address|SW3/1 |SW3/2 |SW3/3 |SW3/4 |SW3/5 |SW3/6|SW3/7|SW3/8|
|-------+------+------+------+------+------+-----+-----+-----|
| 000h | On | On | On | On | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 800h | On | On | On | On | On | On | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 1000h | On | On | On | On | On | On | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 1800h | On | On | On | On | On | On | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 4000h | On | On | On | On | On | Off | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 4800h | On | On | On | On | On | Off | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 5000h | On | On | On | On | On | Off | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 5800h | On | On | On | On | On | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 8000h | On | On | On | On | Off | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 8800h | On | On | On | On | Off | On | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| 9000h | On | On | On | On | Off | On | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
| 9800h | On | On | On | On | Off | On | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| C000h | On | On | On | On | Off | Off | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
| C800h | On | On | On | On | Off | Off | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
| D000h | On | On | On | On | Off | Off | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
| D800h | On | On | On | On | Off | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F0000h | Off | Off | Off | Off | On | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F0800h | Off | Off | Off | Off | On | On | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F1000h | Off | Off | Off | Off | On | On | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F1800h | Off | Off | Off | Off | On | On | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F4000h | Off | Off | Off | Off | On | Off | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F4800h | Off | Off | Off | Off | On | Off | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F5000h | Off | Off | Off | Off | On | Off | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F5800h | Off | Off | Off | Off | On | Off | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F8000h | Off | Off | Off | Off | Off | On | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F8800h | Off | Off | Off | Off | Off | On | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|F9000h | Off | Off | Off | Off | Off | On | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
|F9800h | Off | Off | Off | Off | Off | On | Off | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|FC000h | Off | Off | Off | Off | Off | Off | On | On |
|-------+------+------+------+------+------+-----+-----+-----|
|FC800h | Off | Off | Off | Off | Off | Off | On | Off |
|-------+------+------+------+------+------+-----+-----+-----|
|FD000h | Off | Off | Off | Off | Off | Off | Off | On |
|-------+------+------+------+------+------+-----+-----+-----|
|FD800h | Off | Off | Off | Off | Off | Off | Off | Off |
|------------------------------------------------------------|
| Note: The above table includes only a few of the many |
| memory address settings available. The switches are a |
| binary representation of the decimal memory addresses. |
| SW3/1 is the Most Significant Bit and switch SW3/8 is |
| the Least Significant Bit. The switches have the |
| following decimal values: SW3/8=2048, SW3/7=4096, |
| SW3/6=16384, SW3/5=32768, SW3/4=65536, SW3/3=131072, |
| SW3/2=262144, SW3/1=524288. Turn off the switches and |
| add the values of the switches to obtain the correct |
| address. |
| |
| Notice that there is no switch representation for 8192 |
| decimal. This means that 02000h, 03000h, 06000h, |
| 07000h, 0A000h, 0B000h and 0E000h cannot be |
| represented. Omissions in the above table reflect this.|
+------------------------------------------------------------+