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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420/1425/1433PB REV. A
MB-1420/1425/1433PV REV. A
Processor 80486SX/80487SX/P23T/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set Unidentified
Max. Onboard DRAM 32MB
Cache None
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Turbo switch | JP6 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | External battery | JP8 |
|-------------------+----------+------------------+----------|
| Turbo LED | J3 | Reset switch | SW1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select color | JP5 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP5 | Open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP7 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP7 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 | JP10 | JP11 | JP12 |
|---------------------------+-------+-------+--------+-------|
| 80486SX (PQFP) | Open | Open | Closed | Open |
|---------------------------+-------+-------+--------+-------|
| 80486SX (PGA) | Open | Open | 2 & 3 | Open |
|---------------------------+-------+-------+--------+-------|
| 80487SX | 2 & 3 | 1 & 2 | Closed | Open |
|---------------------------+-------+-------+--------+-------|
| 80486SX (PQFP) & 80487SX | 2 & 3 | 1 & 2 | Closed | 1 & 2 |
|---------------------------+-------+-------+--------+-------|
| 80486SX (PQFP) & P23T | 2 & 3 | 1 & 2 | Closed | 2 & 3 |
|---------------------------+-------+-------+--------+-------|
| 80486SX (PQFP) & | 1 & 2 | 1 & 2 | Closed | 2 & 3 |
| 80486DX/DX2 | | | | |
|---------------------------+-------+-------+--------+-------|
| 80486DX | 1 & 2 | 1 & 2 | Closed | Open |
|---------------------------+-------+-------+--------+-------|
| 80486DX2 | 1 & 2 | 1 & 2 | Closed | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| KEYBOARD BIOS CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 | JP4 |
|----------------+----------+----------+----------+----------|
| 8042 (23 pins) | Closed | Open | Open | Open |
|----------------+----------+----------+----------+----------|
| 8042 (24 pins) | Open | Closed | Open | Open |
|----------------+----------+----------+----------+----------|
| 8042 (27 pins) | Open | Open | Closed | Open |
|----------------+----------+----------+----------+----------|
| 8042 (30 pins) | Open | Open | Open | Closed |
+------------------------------------------------------------+