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# QUATECH, INC.
PXB-721
Card Type I/O controller
Chipset/Controller Intel
I/O Options 8255 I/O ports (3)
Maximum DRAM N/A
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------------+----------+--------------+----------|
| 34-pin 8255 interface | H1 | 34-pin 8255 | H3 |
| 1 | | interface 3 | |
|-----------------------+----------+--------------+----------|
| 34-pin 8255 interface | H2 | | |
| 2 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE MEMORY ADDRESS SELECT |
|------------------------------------------------------------|
| Address | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|---------+--------+--------+--------+-------+-------+-------|
| 230h | Off | On | On | On | Off | Off |
|---------+--------+--------+--------+-------+-------+-------|
| 260h | Off | On | On | Off | Off | On |
|---------+--------+--------+--------+-------+-------+-------|
| 2E0h | Off | On | Off | Off | Off | On |
|---------+--------+--------+--------+-------+-------+-------|
| 300h | Off | Off | On | On | On | On |
|---------+--------+--------+--------+-------+-------+-------|
| 350h | Off | Off | On | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL INTERRUPT EDGE |
|------------------------------------------------------------|
| Edge | J1 |
|----------------------------+-------------------------------|
| Rising | Pins 1 & 3 closed |
|----------------------------+-------------------------------|
| Falling | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECT |
|------------------------------------------------------------|
| IRQ | J5/A | J5/B | J5/C | J5/D | J5/E | J5/F |
|---------+--------+--------+--------+-------+-------+-------|
|IR/FONT> | Open | Open | Open | Open | Open |Closed |
|---------+--------+--------+--------+-------+-------+-------|
| IRQ3 | Open | Open | Open | Open |Closed | Open |
|---------+--------+--------+--------+-------+-------+-------|
| IRQ4 | Open | Open | Open |Closed | Open | Open |
|---------+--------+--------+--------+-------+-------+-------|
| IRQ5 | Open | Open | Closed | Open | Open | Open |
|---------+--------+--------+--------+-------+-------+-------|
| IRQ6 | Open | Closed | Open | Open | Open | Open |
|---------+--------+--------+--------+-------+-------+-------|
| IRQ7 | Closed | Open | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 1 INTERRUPT SELECT |
|------------------------------------------------------------|
| IRQ | J2 |
|----------------------------+-------------------------------|
| A | Pins 2 & 3, 4 & 5 closed |
|----------------------------+-------------------------------|
| B | Pins 1 & 2, 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 2 INTERRUPT SELECT |
|------------------------------------------------------------|
| IRQ | J3 |
|----------------------------+-------------------------------|
| A | Pins 2 & 3, 4 & 5 closed |
|----------------------------+-------------------------------|
| B | Pins 1 & 2, 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 3 INTERRUPT SELECT |
|------------------------------------------------------------|
| IRQ | J4 |
|----------------------------+-------------------------------|
| A | Pins 2 & 3, 4 & 5 closed |
|----------------------------+-------------------------------|
| B | Pins 1 & 2, 5 & 6 closed |
+------------------------------------------------------------+