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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-8425/33/40/50UUC
Processor CXM1/80486SX/UMCU5/CX486M6/AM486DX/80486DX/SL80486DX/CX487M7AM486DX2/SL
AM486DX2/80486DX2/SL80486DX2/AM486DX4/SL AM486DX4
SL80486DX4/P24D/Pentium Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/
Speed 100(internal)MHz
Chip Set Unidentified
Max. 128MB
Onboard
DRAM
Cache 128/256KB
BIOS Award
Dimensions 260mm x 220mm
I/O Parallel port, serial ports (2), game port, 32-bit PCI slots (3), green
Options PC connector, floppy drive interface, IDE interfaces (2)
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| External battery | CN1 | IDE interface | D9 |
| | | LED | |
|------------------+----------+------------------+-----------|
| IDE interface 1 | CN2 | Green PC | JP13 |
| | | connector | |
|------------------+----------+------------------+-----------|
| Parallel port | CN3 | Speaker | JP15 pins |
| | | | 1 - 4 |
|------------------+----------+------------------+-----------|
| Game port | CN4 | Power LED & | JP15 pins |
| | | keylock | 5 - 9 |
|------------------+----------+------------------+-----------|
| Floppy drive | CN5 | Turbo LED | JP15 pins |
| interface | | | 10 - 11 |
|------------------+----------+------------------+-----------|
| Serial port 1 | CN6 | Reset switch | JP15 pins |
| | | | 12 - 13 |
|------------------+----------+------------------+-----------|
| Serial port 2 | CN7 | Turbo switch | JP15 pins |
| | | | 14 - 16 |
|------------------+----------+------------------+-----------|
| IDE interface 2 | CN8 | +5v ground | JP15 pins |
| | | | 17 - 18 |
|------------------+----------+------------------+-----------|
| +5v ground | D8 | 32-bit PCI slots | PC1 - PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | BIOS type select 12v flash | JP3 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | BIOS type select 5v flash | JP3 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | BIOS type select EPROM | JP3 | Open |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP6 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP6 | pins 1 & 2, |
| | | | 3 & 4 closed |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP9 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP10 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP11 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP12 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP20 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP21 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP46 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JP49 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | (1) 512K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 512K x | (1) 512K x | (1) 512K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 512K x | (1) 512K x | (1) 512K x | (1) 512K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 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 | JP24 | JP25 | JP26 |
|-----------+----------------+---------------+---------------|
| 128KB | Open | pins 1 & 2 | Open |
| | | closed | |
|-----------+----------------+---------------+---------------|
| 256KB (A) | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (B) | pins 1 & 2 | pins 2 & 3 | Open |
| | closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP27 | JP28 | JP29 | JP30 | JP31 |
|----------------+--------+--------+--------+-------+--------|
| CX M1 | Closed | Open | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| 80486SX | Open | Closed | Closed | Open | Closed |
|----------------+--------+--------+--------+-------+--------|
| UMC-U5 | Open | Open | Open | 1 & 2 | Open |
|----------------+--------+--------+--------+-------+--------|
| CX486M6 | Open | Open | Open | Open | Open |
|----------------+--------+--------+--------+-------+--------|
| AM486DX | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| 80486DX | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL80486DX | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| CX486M7 | Open | Open | Open | 3 & 4 | Open |
|----------------+--------+--------+--------+-------+--------|
| AM486DX2 | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL AM486DX2 WT | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL AM486DX2 WB | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| 80486DX2 | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL80486DX2 | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| AM486DX4 | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL AM486DX4 WT | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL AM486DX4 WB | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| SL80486DX4 | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| P24D | Open | Closed | Closed | 3 & 4 | Closed |
|----------------+--------+--------+--------+-------+--------|
| Pentium | Open | Open | Open | 2 & 3 | Open |
| Overdrive | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP32 | JP33 | JP34 | JP35 | JP36 |
|-----------------+----------+-------+-------+-------+-------|
| CX M1 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| 80486SX | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| UMC-U5 | Open | Open | Open | Open | Open |
|-----------------+----------+-------+-------+-------+-------|
| CX486M6 | 1 & 2, 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 |
| | & 4 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| AM486DX | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| 80486DX | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL80486DX | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| CX486M7 | 1 & 2, 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 |
| | & 4 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| AM486DX2 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL AM486DX2 WT | 2 & 3, 4 | 2 & 3 | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL AM486DX2 WB | 2 & 3, 4 | 2 & 3 | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| 80486DX2 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL80486DX2 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| AM486DX4 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL AM486DX4 WT | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL AM486DX4 WB | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| SL80486DX4 | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| P24D | 2 & 3, 4 | Open | Open | Open | 1 & 2 |
| | & 5 | | | | |
|-----------------+----------+-------+-------+-------+-------|
| Pentium | 2 & 3, 4 | Open | 2 & 3 | 1 & 2 | 1 & 2 |
| Overdrive | & 5 | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP37 | JP38 | JP39 | JP40 | JP41 | JP42 |
|-------------+-------+-------+------+-------+-------+-------|
| CX M1 | Open | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| 80486SX | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 2 & 3 |
| | | | 2 | | | |
|-------------+-------+-------+------+-------+-------+-------|
| UMC-U5 | 2 & 3 | 2 & 3 | 2 & | 1 & 2 | 3 & 4 | 2 & 3 |
| | | | 3 | | | |
|-------------+-------+-------+------+-------+-------+-------|
| CX486M6 | 2 & 3 | 1 & 2 | 1 & | 3 & 4 | 1 & 2 | 2 & 3 |
| | | | 2 | | | |
|-------------+-------+-------+------+-------+-------+-------|
| AM486DX | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| 80486DX | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL80486DX | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| CX486M7 | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | 2 & 3 | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| AM486DX2 | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL AM486DX2 | 2 & 3 | 1 & 2 | 1 & | 3 & 4 | Open | 1 & |
| WT | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL AM486DX2 | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| WB | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| 80486DX2 | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL80486DX2 | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| AM486DX4 | 2 & 3 | 2 & 3 | 1 & | 1 & 2 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL AM486DX4 | 2 & 3 | 1 & 2 | 1 & | 3 & 4 | Open | 1 & |
| WT | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL AM486DX4 | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| WB | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| SL80486DX4 | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| P24D | 2 & 3 | 2 & 3 | 1 & | 3 & 4 | Open | 1 & |
| | | | 2 | | | 2, 3 |
| | | | | | | & 4 |
|-------------+-------+-------+------+-------+-------+-------|
| Pentium | 2 & 3 | 2 & 3 | 1 & | 3 & | 1 & 2 | 1 & |
| Overdrive | | | 2 | 4, 5 | | 2, 3 |
| | | | | & 6 | | & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP22 | JP23 |
|------------------+--------------------+--------------------|
| Cyrix | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| AMD | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| UMC | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| Intel | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP7 | JP8 |
|---------------+--------------+--------------+--------------|
| 20MHz | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 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 | JP18 | JP19 |
|---------+----------------+----------------+----------------|
| 3.3v | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 4v | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 5v | Open | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CONFIGURATION |
|------------------------------------------------------------|
| DMA | JP47 | JP48 |
|------------------+--------------------+--------------------|
| DMA 1 | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| DMA 3 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+