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# UNIDENTIFIED
MIOXT-320
Card Type Multi I/O
Chipset Unidentified
Controller
I/O Options Floppy drive interface, game port, parallel
port, serial ports (2), clock (location
unidentified)
Maximum Dram N/A
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Game port | J1 | Serial port 2 | J4 |
|---------------+----------+----------------------+----------|
| Parallel port | J2 | Floppy drive | J5 |
| | | interface | |
|---------------+----------+----------------------+----------|
| Serial port 1 | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT SELECTION |
|------------------------------------------------------------|
| J3 | J4 | JP1 |
|-------------------+-------------------+--------------------|
| Port 1 | Port 2 | Pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| Port 2 | Port 1 | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | Port 2 | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|----------+----------+---------+---------+---------+--------|
| COM1 | COM2 | On | Off | On | Off |
|----------+----------+---------+---------+---------+--------|
| COM1 | COM4 | On | Off | Off | On |
|----------+----------+---------+---------+---------+--------|
| COM1 | Disabled | On | Off | Off | Off |
|----------+----------+---------+---------+---------+--------|
| COM3 | COM2 | Off | On | On | Off |
|----------+----------+---------+---------+---------+--------|
| COM3 | COM4 | Off | On | Off | On |
|----------+----------+---------+---------+---------+--------|
| COM3 | Disabled | Off | On | Off | Off |
|----------+----------+---------+---------+---------+--------|
| Disabled | COM2 | Off | Off | On | Off |
|----------+----------+---------+---------+---------+--------|
| Disabled | COM4 | Off | Off | Off | On |
|----------+----------+---------+---------+---------+--------|
| Disabled | Disabled | Off | Off | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT INTERRUPT SELECTION |
|------------------------------------------------------------|
| Port 1 | Port 2 | SW2/1 | SW2/2 | SW2/3 | SW2/4 |
|----------+----------+---------+---------+---------+--------|
| IRQ3 | IRQ4 | Off | On | On | Off |
|----------+----------+---------+---------+---------+--------|
| IRQ4 | IRQ3 | On | Off | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port | Address | SW1/5 | SW1/6 |
|---------------+---------------+--------------+-------------|
| Enabled | 278h (LPT1) | On | Off |
|---------------+---------------+--------------+-------------|
| Enabled | 378h (LPT2) | Off | On |
|---------------+---------------+--------------+-------------|
| Disabled | N/A | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | SW2/5 | SW2/6 |
|--------------------+-------------------+-------------------|
| IRQ5 | Off | On |
|--------------------+-------------------+-------------------|
| IRQ7 | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| GAME PORT CONFIGURATION |
|------------------------------------------------------------|
| Port | SW1/7 |
|-------------------------------+----------------------------|
| Enabled | On |
|-------------------------------+----------------------------|
| Disabled | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK CONFIGURATION |
|------------------------------------------------------------|
| Clock | IRQ | SW1/8 | SW2/7 | SW2/8 |
|------------+-----------+-----------+-----------+-----------|
| Enabled | IRQ2 | On | On | Off |
|------------+-----------+-----------+-----------+-----------|
| Enabled | IRQ5 | On | Off | On |
|------------+-----------+-----------+-----------+-----------|
| Disabled | N/A | Off | N/A | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SECOND SERIAL PORT ACTIVATION |
|------------------------------------------------------------|
| To activate the second serial port, the following chips |
| must be installed: |
|------------------------------------------------------------|
| Chip | Socket |
|--------------------------------------+---------------------|
| SN75188 or MC1488P | U5 |
|--------------------------------------+---------------------|
| SN75189 or MC1489P | U6 |
|--------------------------------------+---------------------|
| IC 8250 | U11 |
+------------------------------------------------------------+