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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1425/33/40/50UCV-B/C/D/E
Processor CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/80486DX4/ Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 64MB
Onboard
DRAM
Cache 32/64/128/256KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+---------------+------------|
| Daughter board | BC20 | Turbo LED | JP15 pins |
| connector | | | 10 - 11 |
|--------------------+----------+---------------+------------|
| External battery | JP8 | Reset switch | JP15 pins |
| | | | 12 - 13 |
|--------------------+----------+---------------+------------|
| Green PC connector | JP14 | Turbo switch | JP15 pins |
| (Ver. D & E) | | | 14 - 16 |
|--------------------+----------+---------------+------------|
| Speaker | JP15 | +5v ground | JP15 pins |
| | pins 1 - | | 17 - 18 |
| | 4 | | |
|--------------------+----------+---------------+------------|
| Power LED & | JP15 | 32-bit VESA | SL1 - SL3 |
| keylock | pins 5 - | local bus | |
| | 9 | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Password normal operation | JP3 | Open |
|---+----------------------------------+--------+------------|
| | Password memory clear | JP3 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP8 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP8 | Closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP11 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP11 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select PQFP or PGA | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU type select PGA enabled & | JP12 | pins 2 & 3 |
| | PQFP disabled | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color (Ver. | JP14 | pins 2 & 3 |
| | B & C only) | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP14 | pins 1 & 2 |
| | (Ver. B & C only) | | closed |
|---+----------------------------------+--------+------------|
| » | VGA card select normal card | JP28 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VGA card select Weitek Power | JP28 | pins 2 & 3 |
| | 9000 VGA card only | | closed |
|---+----------------------------------+--------+------------|
| » | Cyrix CPU type select CX486DX | JP34 | Open |
|---+----------------------------------+--------+------------|
| | Cyrix CPU type select CX486DX2 | JP34 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP36 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Mouse COM port select COM2 | JP39 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Mouse COM port select COM1 | JP39 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|--------+---------------+-------------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|--------+---------------+-------------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|--------+---------------+-------------------+---------------|
| 3MB | (4) 256K x 9 | (1) 256K x 36 | (1) 256K x 36 |
|--------+---------------+-------------------+---------------|
| 4MB | (4) 256K x 9 | (1) 256K x 36 | (1) 512K x 36 |
|--------+---------------+-------------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|--------+---------------+-------------------+---------------|
| 6MB | (4) 256K x 9 | (1) 1M x 36 | (1) 256K x 36 |
|--------+---------------+-------------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|--------+---------------+-------------------+---------------|
| 10MB | (4) 1M x 9 | (1) 1M x 36 | (1) 512K x 36 |
|--------+---------------+-------------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|--------+---------------+-------------------+---------------|
| 16MB | (4) 1M x 9 | (1) 1M x 36 | (1) 2M x 36 |
|--------+---------------+-------------------+---------------|
| 20MB | (4) 4M x 9 | (1) 1M x 36 | NONE |
|--------+---------------+-------------------+---------------|
| 24MB | (4) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|--------+---------------+-------------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|--------+---------------+-------------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|--------+---------------+-------------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|--------+---------------+-------------------+---------------|
| 64MB | (4) 16M x 9 | NONE | NONE |
|------------------------------------------------------------|
| Note: If this board uses 30-pin and 72-pin modules, use |
| this table. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+-----------------------+---------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|--------------+-----------------------+---------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|--------------+-----------------------+---------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|--------------+-----------------------+---------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------------------------------------------------|
| Note: If this board does not use 72-pin sockets, use this |
| table. Depending on board revision, it will have either |
| this setup or the above setup. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (B) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP9 | JP10 |
|------------+---------+---------+----------+--------+-------|
| 32KB | 2 & 3 | Open | Open | Open | Open |
|------------+---------+---------+----------+--------+-------|
| 64KB | 1 & 2 | Open | Open | Closed | Open |
|------------+---------+---------+----------+--------+-------|
| 128KB | 2 & 3 | 2 & 3 | Closed | Closed | Open |
|------------+---------+---------+----------+--------+-------|
| 256KB (A) | 1 & 2 | 1 & 2 | Closed | Closed | 2 & 3 |
|------------+---------+---------+----------+--------+-------|
| 256KB (B) | 1 & 2 | 1 & 2 | Closed | Closed | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP16 | JP17 |
|-------------------+-------------------+--------------------|
| CX486S | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 80486SX | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| ODP486SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| 80486DX4 | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| Pentium Overdrive | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP21 | JP22 | JP23 | JP27 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Closed | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Open | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Closed | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Closed | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 75iMHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 100iMHz | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP41 |
|----------------------------+-------------------------------|
| 2x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP42 | JP44 |
|---------+-------------------------+------------------------|
| 3.3v | Open | Open |
|---------+-------------------------+------------------------|
| 5v | pins 3 & 5, 4 & 6 | pins 1 & 2, 3 & 4 |
| | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS CLOCK CONFIGURATION (SLOT 1) |
|------------------------------------------------------------|
| Setting | JP26 |
|----------------------------+-------------------------------|
| Synchronous | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Asynchronous | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS CLOCK CONFIGURATION (SLOT 2) |
|------------------------------------------------------------|
| Setting | JP25 |
|----------------------------+-------------------------------|
| Synchronous | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Asynchronous | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS CLOCK CONFIGURATION (SLOT 3) |
|------------------------------------------------------------|
| Setting | JP29 |
|----------------------------+-------------------------------|
| Synchronous | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Asynchronous | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AB) |
|------------------------------------------------------------|
| CPU speed | JP19 | JP20 |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AC) |
|------------------------------------------------------------|
| CPU speed | JP19 | JP20 |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+