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# MICRO-STAR INTERNATIONAL CO., LTD.
MS-4131G (VLB 486 AL2G)
Processor 80486SX/80487SX/CX486M7/AMD486DX/AMD486DXL/80486DX/80486DX2/
Pentium Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)66MHz
Speed
Chip Set ALI
Max. 64MB
Onboard
DRAM
Cache 128/256/512KB
BIOS AMI/Award/Phoenix
Dimensions 260mm 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 | JB | Reset switch | JFP pins |
| | | | 19 - 20 |
|------------------+----------+------------------+-----------|
| Power LED & | JFP pins | Green PC | JG1 |
| keylock | 1 -5 | connector | |
| | | (monitor) | |
|------------------+----------+------------------+-----------|
| Speaker | JFP pins | Green PC LED | JG2 |
| | 7 - 10 | connector | |
|------------------+----------+------------------+-----------|
| Turbo LED | JFP pins | Green PC | JG3 |
| | 12 - 13 | connector (sleep | |
| | | mode) | |
|------------------+----------+------------------+-----------|
| Turbo switch | JFP pins | 32-bit VESA | SL1 - SL3 |
| | 15 - 17 | Local bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | On board battery installed | JB | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | External battery installed | JB | pins 1 & 2, |
| | | | 3 & 4 closed |
|---+--------------------------------+--------+--------------|
| » | PQFP CPU disabled | JC4 | Closed |
|---+--------------------------------+--------+--------------|
| | PQFP CPU enabled | JC4 | Open |
|---+--------------------------------+--------+--------------|
| » | Factory configured - do not | JC6 | N/A |
| | alter | | |
|---+--------------------------------+--------+--------------|
| » | Monitor type select monochrome | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select color | JP1 | pins 2 & 3 |
| | | | 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 | NONE | NONE | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | NONE | (1) 256K x 36 | (1) 512K 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 | NONE | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 1M x 9 | (1) 256K x 36 | (1) 256K 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 | NONE | NONE | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 2M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 9MB | NONE | (1) 256K x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 10MB | (4) 1M x 9 | (1) 1M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 10MB | (4) 256K x 9 | (1) 256K x 36 | (1) 2M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 10MB | NONE | (1) 512K x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | NONE | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 13MB | (4) 1M x 9 | (1) 256K x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 13MB | (4) 256K x 9 | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | NONE | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 2M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 1M x 9 | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | NONE | (1) 512K x 36 | (1) 4M 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 | NONE | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 1M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 1M x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 4M x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 1M x 9 | (1) 256K x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 22MB | (4) 1M x 9 | (1) 4M x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | NONE | (1) 2M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 25MB | (4) 256K x 9 | (1) 4M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 25MB | (4) 4M x 9 | (1) 256K x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 28MB | (4) 1M x 9 | (1) 4M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 28MB | (4) 4M x 9 | (1) 1M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | NONE | NONE | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 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 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | NONE | (1) 256K x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 4M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 34MB | (4) 4M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 34MB | (4) 4M x 9 | (1) 4M x 36 | (1) 512K x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 34MB | (4) 256K x 9 | (1) 256K x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 34MB | NONE | (1) 512K x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | NONE | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 37MB | (4) 256K x 9 | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 37MB | (4) 256K x 9 | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 37MB | (4) 4M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 40MB | (4) 1M x 9 | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 40MB | (4) 4M x 9 | (1) 4M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 40MB | NONE | (1) 2M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 49MB | (4) 256K x 9 | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 49MB | (4) 4M x 9 | (1) 256K x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 52MB | (4) 1M x 9 | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | NONE | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (4) 4M x 9 | (1) 4M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------+-------------+-------------+------------------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 or (1) 16K |
| | | | x 8 or (1) 32K x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 or (1) 32K |
| | | | x 8 |
|-------+-------------+-------------+------------------------|
| 256KB | (4) 64K x 8 | NONE | (1) 16K x 8 or (1) 32K |
| | | | x 8 |
|-------+-------------+-------------+------------------------|
| 512KB | (4) 128K x | NONE | (1) 32K x 8 |
| | 8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 | JS3 |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 512KB | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JC1 | JC2 |
|-------------------+-------------------------+--------------|
| CX486 M7 | 2A & 3A, 1B & 2B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|-------------------+-------------------------+--------------|
| 80486SX | 1A & 2A, 1B & 2B, 1C & | 2 & 3 |
| | 2C | |
|-------------------+-------------------------+--------------|
| SL 80486SX | 1A & 2A, 1B & 2B, 1C & | 2 & 3 |
| | 2C | |
|-------------------+-------------------------+--------------|
| 80487SX | 1A & 2A, 1B & 2B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|-------------------+-------------------------+--------------|
| AMD486DX/DXL | 1A & 2A, 1B & 2B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|-------------------+-------------------------+--------------|
| 80486DX/DX2 | 1A & 2A, 1B & 2B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|-------------------+-------------------------+--------------|
| SL 80486DX/DX2 | 1A & 2A, 1B & 2B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|-------------------+-------------------------+--------------|
| Pentium Overdrive | 1A & 2A, 2B & 3B, 1C & | 1 & 2, 3 & 4 |
| | 2C | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JC3 | JC5 |
|----------------+-----------------------------------+-------|
| CX486 M7 | 2A & 3A, 4A & 5A, 3B & 4B, 5B & | 1 & 2 |
| | 6B, 3C & 4C, 5C & 6C | |
|----------------+-----------------------------------+-------|
| 80486SX | 4C & 5C | 1 & 2 |
|----------------+-----------------------------------+-------|
| SL 80486SX | 1A & 2A, 5A & 6A, 4C & 4D, 5C & | 1 & 2 |
| | 6C | |
|----------------+-----------------------------------+-------|
| 80487SX | 2B & 3B, 4C & 5C | 1 & 2 |
|----------------+-----------------------------------+-------|
| AMD486DX/DXL | 2A & 2B, 3B & 4B, 5A & 5B, 4C & | 1 & 2 |
| | 5C | |
|----------------+-----------------------------------+-------|
| 80486DX/DX2 | 3B & 4B, 4C & 5C | 1 & 2 |
|----------------+-----------------------------------+-------|
| SL 80486DX/DX2 | 1A & 2A, 3B & 4B, 4C & 4D, 5A & | 1 & 2 |
| | 6A, 5C & 6C | |
|----------------+-----------------------------------+-------|
| Pentium | 1A & 2A, 5A &6A, 2B & 3B, 5C & 6C | 2 & 3 |
| Overdrive | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JK1 | JK2 | JK3 |
|----------+---------------------------------+-------+-------|
| 25MHz | 1 & 2, 7 & 9, 8 & 10, 14 & 16 | 2 & 3 | 1 & 2 |
|----------+---------------------------------+-------+-------|
| 33MHz | 1 & 2, 3 & 4, 5 & 6, 7 & 9, 8 & | 2 & 3 | 1 & 2 |
| | 10, 14 & 16 | | |
|----------+---------------------------------+-------+-------|
| 40MHz | 3 & 4, 10 & 12, 14 & 16 | 1 & 2 | 2 & 3 |
|----------+---------------------------------+-------+-------|
| AMD40MHz | 3 & 4, 10 & 12, 14 & 16 | 4 & 5 | 2 & 3 |
|----------+---------------------------------+-------+-------|
| 50iMHz | 1 & 2, 7 & 9, 8 & 10, 14 & 16 | 2 & 3 | 1 & 2 |
|----------+---------------------------------+-------+-------|
| 50MHz | 1 & 2, 7 & 9, 10 & 12 | 1 & 2 | 2 & 3 |
|----------+---------------------------------+-------+-------|
| 66iMHz | 1 & 2, 3 & 4, 5 & 6, 7 & 9, 8 & | 2 & 3 | 1 & 2 |
| | 10, 14 & 16 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP2 |
|----------------------------+-------------------------------|
| <=33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| >33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP3 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 open |
|----------------------------+-------------------------------|
| 1 wait state | pins 1 & 2 closed |
+------------------------------------------------------------+