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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1425/1433/1440/1450UIV (REV. 1)
Processor CX486M6/80486SX/SL80486SX/CX486DX/AM486DX/UMC U5/80486DX/
SL80486DX/CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/
80486DX4/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/
Speed 100(internal)/120(internal)MHz
Chip Set Unidentified
Max. 64MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI/Award
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3), floppy drive interface, green
Options PC connector
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+-------------+-----------------+------------|
| Speaker | JP15 pins 1 | +5v ground | JP15 pins |
| | - 4 | | 17 & 18 |
|---------------+-------------+-----------------+------------|
| Power LED & | JP15 pins 5 | External | JP8 |
| keylock | - 9 | battery | |
|---------------+-------------+-----------------+------------|
| Turbo LED | JP15 pins | Green PC LED | JP24 |
| | 10 & 11 | | |
|---------------+-------------+-----------------+------------|
| Reset switch | JP15 pins | Green PC | JP25 |
| | 12 & 13 | connector | |
|---------------+-------------+-----------------+------------|
| Turbo switch | JP15 pins | 32-bit VESA | SL1 - SL3 |
| | 14 & 15 | local bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP8 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | DS12887 normal operation | JP32 | Open |
|---+----------------------------------+--------+------------|
| | DS12887 clear | JP32 | Closed |
|---+----------------------------------+--------+------------|
| » | VESA bus slot select synchronous | JP36 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VESA bus slot select | JP36 | pins 2 & 3 |
| | asynchronous | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | NONE | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | NONE | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | NONE | (1) 256K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | NONE | (1) 512K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 256K x 9 | (1) 256K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 512K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 1M x 9 | NONE | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | NONE | (1) 1M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | NONE | (1) 512K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 7MB | (4) 256K x 9 | (1) 1M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 7MB | (4) 1M x 9 | (1) 256K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | NONE | NONE | (1) 2M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 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 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | NONE | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | NONE | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | NONE | (1) 2M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 4M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 4M x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 19MB | (4) 256K x 9 | (1) 4M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | NONE | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | NONE | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 4M x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 4M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 34MB | (4) 4M x 9 | (1) 4M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | NONE | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | NONE | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 8M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | NONE | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 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) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (B) | (4) 64K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP7 | JP9 | JP10 | JP33 |
|-----------+--------+-----------------+------------+--------|
| 64KB | Open | Open | pins 2 & 3 | Open |
| | | | closed | |
|-----------+--------+-----------------+------------+--------|
| 128KB | Open | pins 1 & 2 | pins 1 & 2 | Closed |
| | | closed | closed | |
|-----------+--------+-----------------+------------+--------|
| 256KB (A) | Closed | pins 2 & 3 | pins 2 & 3 | Closed |
| | | closed | closed | |
|-----------+--------+-----------------+------------+--------|
| 256KB (B) | Closed | pins 1 & 2, 3 & | pins 1 & 2 | Closed |
| | | 4 closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP11 | JP12 | JP13 | JP17 | JP18 |
|------------+-----------+--------+--------+--------+--------|
| CX486SX | 1 & 2, 3 | 1 & 2, | 2 & 3 | Open | 2 & 3, |
| | & 4, 5 & | 3 & 4, | | | 4 & 5 |
| | 6 | 5 & 6 | | | |
|------------+-----------+--------+--------+--------+--------|
| 80486SX | Open | 2 & 3 | 2 & 3 | Open | Open |
|------------+-----------+--------+--------+--------+--------|
| SL80486SX | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| CX486DX | 1 & 2, 3 | 1 & 2, | 1 & 2, | 1 & 2 | 2 & 3, |
| | & 4, 5 & | 3 & 4, | 3 & 4 | | 4 & 5 |
| | 6 | 5 & 6 | | | |
|------------+-----------+--------+--------+--------+--------|
| AM486DX | Open | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | 3 & 4 | | |
|------------+-----------+--------+--------+--------+--------|
| 80486DX | Open | 2 & 3 | 1 & 2, | 1 & 2 | Open |
| | | | 3 & 4 | | |
|------------+-----------+--------+--------+--------+--------|
| SL80486DX | 1 & 2, 4 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | & 5 | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| UMC U5S | 2 & 3 | 2 & 3 | 2 & 3 | 3 & 4 | 1 & 2 |
|------------+-----------+--------+--------+--------+--------|
| CX486DX2 | 1 & 2, 3 | 1 & 2, | 1 & 2, | 1 & 2 | 2 & 3, |
| | & 4, 5 & | 3 & 4, | 3 & 4 | | 4 & 5 |
| | 6 | 5 & 6 | | | |
|------------+-----------+--------+--------+--------+--------|
| AM486DX2 | Open | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | 3 & 4 | | |
|------------+-----------+--------+--------+--------+--------|
| SLAM486DX2 | 1 & 2 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| 80486DX2 | Open | 2 & 3 | 1 & 2, | 1 & 2 | Open |
| | | | 3 & 4 | | |
|------------+-----------+--------+--------+--------+--------|
| SL80486DX2 | 1 & 2, 4 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | & 5 | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| CX486DX4 | 1 & 2, 3 | 1 & 2, | 1 & 2, | 1 & 2 | 2 & 3, |
| | & 4, 5 & | 3 & 4, | 3 & 4 | | 4 & 5 |
| | 6 | 5 & 6 | | | |
|------------+-----------+--------+--------+--------+--------|
| AM486DX4 | Open | 2 & 3 | 1 & 2, | 2 & 3 | Open |
| | | | 3 & 4 | | |
|------------+-----------+--------+--------+--------+--------|
| SLAM486DX4 | 1 & 2 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| 80486DX4 | 1 & 2, 4 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | & 5 | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| P24D | 1 & 2, 4 | 1 & 2, | 1 & 2, | 1 & 2 | 3 & 4, |
| | & 5 | 4 & 5 | 3 & 4 | | 5 & 6 |
|------------+-----------+--------+--------+--------+--------|
| P24T | 1 & 2 | 1 & 2 | 1 & 2, | 2 & 3 | 5 & 6 |
| | | | 3 & 4 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
| All jumpers may not be present on all revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP23 | JP35 | JP40 |
|------------+----------+--------+-------+---------+---------|
| CX486SX | 2 & 3, 4 | Open | Open | Open | Open |
| | & 5 | | | | |
|------------+----------+--------+-------+---------+---------|
| 80486SX | Open | Open | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| SL80486SX | 1 & 2, 3 | Open | Open | Closed | Open |
| | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| CX486DX | 2 & 3 | Open | Open | Open | Open |
|------------+----------+--------+-------+---------+---------|
| AM486DX | Open | 1 & 2 | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| 80486DX | Open | Open | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| SL80486DX | 1 & 2, 3 | Open | Open | Open | Open |
| | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| UMC U5S | Open | Open | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| CX486DX2 | 2 & 3 | Open | Open | Open | Open |
|------------+----------+--------+-------+---------+---------|
| AM486DX2 | Open | 1 & 2 | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| SL | 1 & 2, 3 | Open | Open | Open | Closed |
| AM486DX2 | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| 80486DX2 | Open | Open | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| SL80486DX2 | 1 & 2, 3 | Open | Open | Open | Open |
| | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| CX486DX4 | 2 & 3 | Open | Open | Open | Open |
|------------+----------+--------+-------+---------+---------|
| AM486DX4 | Open | 1 & 2 | Open | Closed | Open |
|------------+----------+--------+-------+---------+---------|
| SL | 1 & 2, 3 | Open | Open | Open | Closed |
| AM486DX4 | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| 80486DX4 | 1 & 2, 3 | Open | Open | Open | Open |
| | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| P24D | 1 & 2, 3 | Open | Open | Open | Open |
| | & 4 | | | | |
|------------+----------+--------+-------+---------+---------|
| P24T | 1 & 2, 3 | Open | Open | Open | Open |
| | & 4 | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
| All jumpers may not be present on all revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP4 | JP5 | JP6 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 80iMHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP14 | JP16 | JP27 | JP38 | JP39 |
|--------------+---------+---------+--------+-------+--------|
| 3.3v - 3.6v | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Open |
|--------------+---------+---------+--------+-------+--------|
| 4v | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | Closed |
|--------------+---------+---------+--------+-------+--------|
| 5v | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP22 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP21 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+