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# MULTI-TECH SYSTEMS, INC.
SPB-AT
Card Type Multi I/O card
Chip Set INS 16450 chip
Maximum Onboard Memory None
I/O Options parallel port, serial port
Data Bus 16-bit ISA
Floppy drives supported None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|---------------------+-------+----------------------+-------|
| Serial port | CN1 | Parallel port | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | SW1/5 | SW1/7 |
|--------------------+-------------------+-------------------|
| 278h | Off | On |
|--------------------+-------------------+-------------------|
| 378h | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | SW1/1 | COM1/3 |
|--------------------+-------------------+-------------------|
| COM1 | On | Off |
|--------------------+-------------------+-------------------|
| COM2 | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | SW1/2 | SW1/4 | SW1/6 | SW1/8 |
|-----------+------------+-----------+-----------+-----------|
| IRQ3 | Off | On | Off | Off |
|-----------+------------+-----------+-----------+-----------|
| IRQ4 | On | Off | Off | Off |
|-----------+------------+-----------+-----------+-----------|
| IRQ5 | Off | Off | Off | On |
|-----------+------------+-----------+-----------+-----------|
| IRQ7 | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| Note: The purpose of J1 and J2 is unidentified. |
+------------------------------------------------------------+