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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1425/33/40/50 UIV
Processor 80486SX/CX486M6/CX486M7/AMD486DXL/80486DX/80486DX2/80486DX4/
P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 64MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI/Award
Dimensions 254mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP8 | Turbo switch | JP15E |
|------------------+----------+-------------------+----------|
| Speaker | JP15A | +5vDC | JP15F |
|------------------+----------+-------------------+----------|
| Power LED & | JP15B | Green PC LED | JP24 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP15C | Green PC | JP25 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Reset switch | JP15D | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP32 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0/2 | Bank 1/3 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | NONE | NONE | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 1MB | (1) 256K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 256K x 36 | NONE | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 512K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 3MB | (1) 256K x 36 | (1) 256K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 3MB | NONE | (1) 512K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 3MB | (1) 256K x 36 | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 3MB | (1) 512K x 36 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 256K x 36 | (1) 512K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 4MB | NONE | NONE | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 1M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (1) 1M x 36 | NONE | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 1M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 5MB | (1) 256K x 36 | NONE | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 256K x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (1) 1M x 36 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | NONE | (1) 512K x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 7MB | (1) 1M x 36 | (1) 512K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 7MB | (1) 256K x 36 | (1) 512K x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 36 | NONE | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (1) 2M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 9MB | (1) 1M x 36 | (1) 1M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 9MB | (1) 1M x 36 | (1) 256K x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 9MB | (1) 256K x 36 | (1) 1M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 10MB | (1) 1M x 36 | (1) 512K x 36 | (4) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0/2 | Bank 1/3 | Bank 2 |
|------------+---------------+---------------+---------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 12MB | NONE | (1) 2M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 1M x 36 | (1) 2M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 2M x 36 | (1) 1M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | NONE | NONE | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 4M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (1) 4M x 36 | NONE | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 4M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 17MB | (1) 256K x 36 | NONE | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 256K x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 18MB | (1) 256K x 36 | (1) 4M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 18MB | (1) 4M x 36 | (1) 256K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 19MB | (1) 4M x 36 | (1) 512K x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 4M x 36 | NONE | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 4M x 36 | NONE | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 1M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 1M x 36 | (1) 4M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 4M x 36 | (1) 1M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 1M x 36 | (1) 4M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 36 | NONE | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (1) 8M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 33MB | (1) 8M x 36 | NONE | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 33MB | NONE | (1) 8M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 33MB | (1) 4M x 36 | (1) 4M x 36 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 33MB | (1) 4M x 36 | (1) 256K x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 33MB | (1) 256K x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 34MB | (1) 4M x 36 | (1) 512K x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 4M x 36 | (1) 1M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 8M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 8M x 36 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------+----------------+---------------+--------------|
| UMC486 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------+----------------+---------------+--------------|
| CX486M6 | 1 & 2, 3 & 4, | 1 & 2, 3 & 4, | 2 & 3 |
| | 5 & 6 | 5 & 6 | |
|------------+----------------+---------------+--------------|
| 80486SX | Open | 2 & 3 | 2 & 3 |
|------------+----------------+---------------+--------------|
| CX486M7 | 1 & 2, 3 & 4, | 1 & 2, 3 & 4, | 1 & 2, 3 & 4 |
| | 5 & 6 | 5 & 6 | |
|------------+----------------+---------------+--------------|
| AMD486DXL | 2 & 3 | 2 & 3 | 1 & 2, 3 & 4 |
|------------+----------------+---------------+--------------|
| 80486DX | Open | 2 & 3 | 1 & 2, 3 & 4 |
|------------+----------------+---------------+--------------|
| SL80486DX | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 |
|------------+----------------+---------------+--------------|
| 80486DX4 | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 |
|------------+----------------+---------------+--------------|
| P24D | 1 & 2, 4 & 5 | 1 & 2, 4 & 5 | 1 & 2, 3 & 4 |
|------------+----------------+---------------+--------------|
| Pentium | 1 & 2 | 1 & 2 | 1 & 2, 3 & 4 |
| Overdrive | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP17 | JP18 | JP19 | JP35 |
|------------+------------+------------+------------+--------|
| UMC486 | 3 & 4 | 1 & 2 | Open | Closed |
|------------+------------+------------+------------+--------|
| CX486M6 | Open | 2 & 3, 4 & | 2 & 3, 4 & | Open |
| | | 5 | 5 | |
|------------+------------+------------+------------+--------|
| 80486SX | Open | Open | Open | Closed |
|------------+------------+------------+------------+--------|
| CX486M7 | 1 & 2 | 2 & 3, 4 & | 2 & 3 | Open |
| | | 5 | | |
|------------+------------+------------+------------+--------|
| AMD486DXL | 1 & 2, 3 & | 1 & 2 | Open | Closed |
| | 4 | | | |
|------------+------------+------------+------------+--------|
| 80486DX | 1 & 2 | Open | Open | Closed |
|------------+------------+------------+------------+--------|
| SL80486DX | 1 & 2 | 5 & 6 | 1 & 2, 3 & | Open |
| | | | 4 | |
|------------+------------+------------+------------+--------|
| 80486DX4 | 1 & 2 | 5 & 6 | 1 & 2, 3 & | Open |
| | | | 4 | |
|------------+------------+------------+------------+--------|
| P24D | 1 & 2 | 3 & 4, 5 & | 1 & 2, 3 & | Open |
| | | 6 | 4 | |
|------------+------------+------------+------------+--------|
| Pentium | 2 & 3 | 5 & 6 | 1 & 2, 3 & | Open |
| Overdrive | | | 4 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP14 | JP16 | JP27 |
|-------------+---------------+---------------+--------------|
| 3.45v (DX4) | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------------+---------------+---------------+--------------|
| 5.0v | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+