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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1425AEA-V, MB-1433AEA-V, MB-1440AEA-V, MB-1450AEA-V
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 25/33/40/50(internal)/50/66(internal)MHz
Chip Set Advanced
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP8 | Turbo switch | JP15E |
|------------------+----------+-------------------+----------|
| Speaker | JP15A | 5V ground | JP15F |
| | | connector | |
|------------------+----------+-------------------+----------|
| Power LED & | JP15B | 32-bit VESA Local | S1 |
| keylock | | bus slot | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP15C | 32-bit VESA Local | S2 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Reset switch | JP15D | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J01 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| | 7 Bit TAG RAM installed | JP6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 8 Bit TAG RAM installed | JP6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Dallas Real time clock 1287 | JP11 | Closed |
| | installed | | |
|---+----------------------------------+--------+------------|
| | Battery & Real time clock 146818 | JP11 | Open |
| | installed | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP14 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP14 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP16 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP16 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU PQFP installed | JP22 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU PGA installed | JP22 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | VESA bus clock asynchronous mode | JP26 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VESA bus clock synchronous mode | JP26 | pins 2 & 3 |
| | | | 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) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Max | Bank 0 | Bank 1 | TAG |
| | Cachable | | | |
|-------+-------------+------------+------------+------------|
| 64KB | 8MB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | 16MB | (4) 32K x | NONE | (1) 8K x 8 |
| | | 8 | | |
|-------+-------------+------------+------------+------------|
| 256KB | 32MB | (4) 32K x | (4) 32K x | (1) 32K x |
| | | 8 | 8 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP12 | JP19 |
|---------+-----------------------------+--------------------|
| 64KB | Open | pins 1 & 2 closed |
|---------+-----------------------------+--------------------|
| 128KB | pins 1 & 2 and 3 & 4 closed | pins 2 & 3 closed |
|---------+-----------------------------+--------------------|
| 256KB | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP13 | JP20 |
|------------------+--------------------+--------------------|
| 80486SX | Open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| ODP486SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP10 | JP23 | JP24 |
|----------+-------------------+---------+---------+---------|
| 25MHz | pins 2 & 3 closed | Open | Open | Open |
|----------+-------------------+---------+---------+---------|
| 33MHz | pins 2 & 3 closed | Open | Closed | Open |
|----------+-------------------+---------+---------+---------|
| 40MHz | pins 1 & 2 closed | Closed | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 50i MHz | pins 2 & 3 closed | Open | Open | Open |
|----------+-------------------+---------+---------+---------|
| 50MHz | pins 1 & 2 closed | Closed | Open | Open |
|----------+-------------------+---------+---------+---------|
| 66i MHz | pins 2 & 3 closed | Open | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | J02 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+