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# LEADING TECHNOLOGY
386SX 25/33
Processor 80386SX
Processor 25/33MHz
Speed
Chip Set Unidentified
Max. Onboard 4MB
DRAM
Cache None
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, game port, IDE interface,
parallel port, serial ports (2)
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN1 | Reset switch | J2 pin 5 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | Ground | J2 pin 8 |
|-------------------+----------+------------------+----------|
| Game port | CN3 | Speaker | J8 |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | External battery | J9 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J1 | IDE interface | J10 |
|-------------------+----------+------------------+----------|
| Power LED & | J2 pin 3 | Floppy drive | J12 |
| keylock | | interface | |
|-------------------+----------+------------------+----------|
| Turbo switch | J2 pin 4 | Riser Card | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | NPU disabled | JP1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | NPU enabled | JP1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | External battery installed | JP6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | External battery not installed | JP6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Parity disabled (3 SIMM | JP15 | Open |
| | motherboard) | | |
|---+----------------------------------+--------+------------|
| | Parity enabled (4 SIMM | JP15 | Closed |
| | motherboard) | | |
|---+----------------------------------+--------+------------|
| » | Parallel port IRQ select IRQ7 | JP34 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port IRQ select IRQ5 | JP34 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | IDE interface enabled | JP35 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE interface disabled | JP35 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Game port installed | JP42 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Game port not installed | JP42 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (WITH BANK 0A FACTORY INSTALLED) |
|------------------------------------------------------------|
| Size | Bank 0a | Bank 1 | Bank 2 | Bank 3 |
|----------+-------------+-----------+-----------+-----------|
| 1MB | (2) 1M x 4 | NONE | NONE | NONE |
|----------+-------------+-----------+-----------+-----------|
| 2MB | (2) 1M x 4 | (1) 1M x | NONE | NONE |
| | | 9 | | |
|----------+-------------+-----------+-----------+-----------|
| 4MB | (2) 1M x 4 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 9 | 9 | 9 |
|------------------------------------------------------------|
| Note: This configuration is applicable only with Bank |
| O factory installed. The mainboard is manufactured |
| with either 4 SIMM banks or 3 SIMM banks and 2 DRAM |
| banks. The 2 DRAM banks are factory installed and are |
| not configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION (WITH BANK 0 FACTORY INSTALLED) |
|------------------------------------------------------------|
| Size | JP11-12, JP16, JP19-27 |
|---------------------+--------------------------------------|
| 1MB | pins 2 & 3 closed |
|---------------------+--------------------------------------|
| 2MB | pins 2 & 3 closed |
|---------------------+--------------------------------------|
| 4MB | pins 2 & 3 closed |
|------------------------------------------------------------|
| Note: This configuration is applicable only with Bank O |
| factory installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (WITH BANK 0 USER INSTALLED) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+---------------+------------+------------+----------|
| 2MB | (1) 1M x 9 | (1) 1M x 9 | NONE | NONE |
|-------+---------------+------------+------------+----------|
| 4MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x |
| | | | | 9 |
|------------------------------------------------------------|
| Note: This configuration is applicable only with Bank O |
| user installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (WITH BANK 0 USER INSTALLED) |
|------------------------------------------------------------|
| Size | JP11-12, JP16, JP19-27 |
|--------------------+---------------------------------------|
| 2MB | pins 2 & 3 closed |
|--------------------+---------------------------------------|
| 4MB | pins 2 & 3 closed |
|------------------------------------------------------------|
| Note: This configuration is applicable only with Bank O |
| user installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| Parallel port | JP30 | JP31 |
|------------------+--------------------+--------------------|
| LPT1 (0378h) | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| LPT1 (02BCh) | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| LPT2 (0278h) | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | JP28 | JP40 |
|------------------+--------------------+--------------------|
| » | COM 1 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | COM 3 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | COM 4 | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Disabled | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 INTERRUPT CONFIGURATION |
|------------------------------------------------------------|
| IRQ | JP32 | JP39 |
|------------------+--------------------+--------------------|
| » | IRQ4 | pins 1 & 2 closed | N/A |
|---+--------------+--------------------+--------------------|
| | IRQ3 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 CONFIGURATION |
|------------------------------------------------------------|
| Port 2 | JP29 | JP41 |
|------------------+--------------------+--------------------|
| » | COM 2 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | COM 3 | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | COM 4 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Disabled | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 INTERRUPT CONFIGURATION |
|------------------------------------------------------------|
| IRQ | JP32 | JP39 |
|------------------+--------------------+--------------------|
| » | IRQ3 | N/A | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | IRQ4 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP37 | JP44 |
|--------------------+-------------------+-------------------|
| A = 3.5" & B = | pins 2 & 3 closed | pins 2 & 3 closed |
| 5.25" | | |
|--------------------+-------------------+-------------------|
| A = 5.25" & B = | pins 2 & 3 closed | pins 1 & 2 closed |
| 3.5" | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PAGE INTERLEAVE CONFIGURATION |
|------------------------------------------------------------|
| Mode | JP14 | JP18 |
|----------------------------------+------------+------------|
| Disabled | pins 1 & 2 | pins 2 & 3 |
| | closed | closed |
|----------------------------------+------------+------------|
| Enabled ( requires 4 SIMM | pins 2 & 3 | pins 2 & 3 |
| configuration) | closed | closed |
+------------------------------------------------------------+