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# U.S. ROBOTICS, INC.
HIGH SPEED DUAL ASYNCHRONOUS SERIAL BOARD
Card Type Serial card
Chipset Controller 165550AN UART
I/O Options Serial port (2)
Maximum DRAM N/A
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| 9-pin serial port | CN1 | 9-pin serial | CN2 |
| | | port | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CHANNEL A CONFIGURATION |
|------------------------------------------------------------|
| Setting | J1 | J2 | J3 | J4 |
|-------------+-------------+----------+----------+----------|
| » | COM1: | Pins 1 & 2 | Open | Open | Open |
| | (3F8h) | closed | | | |
|---+---------+-------------+----------+----------+----------|
| | COM2: | Open | Pins 1 & | Open | Open |
| | (3E8h) | | 2 closed | | |
|---+---------+-------------+----------+----------+----------|
| | COM3: | Open | Open | Pins 1 & | Open |
| | (2F8h) | | | 2 closed | |
|---+---------+-------------+----------+----------+----------|
| | COM4: | Open | Open | Open | Pins 1 & |
| | (2E8h) | | | | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CHANNEL B CONFIGURATION |
|------------------------------------------------------------|
| Setting | J1 | J2 | J3 | J4 |
|-------------+-------------+----------+----------+----------|
| » | COM2: | Open | Pins 2 & | Open | Open |
| | (3E8h) | | 3 closed | | |
|---+---------+-------------+----------+----------+----------|
| | COM1: | Pins 2 & 3 | Open | Open | Open |
| | (3F8h) | closed | | | |
|---+---------+-------------+----------+----------+----------|
| | COM3: | Open | Open | Pins 2 & | Open |
| | (2F8h) | | | 3 closed | |
|---+---------+-------------+----------+----------+----------|
| | COM4: | Open | Open | Open | Pins 2 & |
| | (2E8h) | | | | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHANNEL A INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | J5/A | J5/B | J5/C | J5/D | J5/E |
|---------+----------+---------+---------+---------+---------|
| » | 4 | Open | Open | Closed | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 2 | Closed | Open | Open | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 3 | Open | Closed | Open | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 5 | Open | Open | Open | Closed | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 7 | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHANNEL B INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | J6/A | J6/B | J6/C | J6/D | J6/E |
|---------+----------+---------+---------+---------+---------|
| » | 3 | Open | Closed | Open | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 2 | Closed | Open | Open | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 4 | Open | Open | Closed | Open | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 5 | Open | Open | Open | Closed | Open |
|---+-----+----------+---------+---------+---------+---------|
| | 7 | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+