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# UNIDENTIFIED
MS-4125 VERSION 2.1
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set Contaq
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+-----------------+-----------|
| Auxiliary | J2 | Turbo LED | J5 pins |
| keyboard | | | 12 - 13 |
| connector | | | |
|-------------------+----------+-----------------+-----------|
| External battery | J4 | Turbo switch | J5 pins |
| | | | 15 - 17 |
|-------------------+----------+-----------------+-----------|
| Power LED & | J5 pins | Reset switch | J5 pins |
| keylock | 1 - 5 | | 19 - 20 |
|-------------------+----------+-----------------+-----------|
| Speaker | J5 pins | 32-bit VESA | SL1 & SL2 |
| | 6 - 10 | local bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery type select internal | J4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | J4 | Closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP17 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP17 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP26 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP37 | pins 1 & 2 |
| | alter | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP6 | JP7 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 4 & 5 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP31 | JP32 | JP33 |
|-------------+------------------+------------+--------------|
| 80486SX | Open | Open | pins 1 & 2 |
| (PQFP) | | | closed |
|-------------+------------------+------------+--------------|
| 80486SX | pins 3 & 4 | Open | pins 2 & 3, |
| (PGA) | closed | | 4 & 5 closed |
|-------------+------------------+------------+--------------|
| ODP486SX | pins 2 & 3, 4 & | pins 1 & 2 | pins 2 & 3, |
| | 5 closed | closed | 4 & 5 closed |
|-------------+------------------+------------+--------------|
| 80487SX | pins 2 & 3, 4 & | pins 1 & 2 | pins 2 & 3, |
| | 5 closed | closed | 4 & 5 closed |
|-------------+------------------+------------+--------------|
| 80486DX | pins 1 & 2 | pins 4 & 5 | pins 1 & 2 |
| (PQFP) | closed | closed | closed |
|-------------+------------------+------------+--------------|
| 80486DX | pins 2 & 3, 4 & | pins 2 & 3 | pins 2 & 3, |
| (PGA) | 5 closed | closed | 4 & 5 closed |
|-------------+------------------+------------+--------------|
| 80486DX2 | pins 2 & 3, 4 & | pins 2 & 3 | pins 2 & 3, |
| | 5 closed | closed | 4 & 5 closed |
|-------------+------------------+------------+--------------|
| Pentium | pins 2 & 3, 4 & | pins 1 & 2 | pins 2 & 3, |
| Overdrive | 5 closed | closed | 4 & 5 closed |
|------------------------------------------------------------|
| Note: Depending on board revision, it will have either a |
| PGA or PQFP socket. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP8 | JP12 | JP13 | JP14 |
|----------+-------------------+---------+---------+---------|
| 25MHz | pins 2 & 3 closed | Open | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 33MHz | pins 1 & 2 closed | Closed | Open | Open |
|----------+-------------------+---------+---------+---------|
| 40MHz | pins 1 & 2 closed | Closed | Closed | Open |
|----------+-------------------+---------+---------+---------|
| 50iMHz | pins 2 & 3 closed | Open | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 50MHz | pins 1 & 2 closed | Open | Closed | Open |
|----------+-------------------+---------+---------+---------|
| 66iMHz | pins 1 & 2 closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP19 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP20 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA CARD TYPE CONFIGURATION |
|------------------------------------------------------------|
| Card type | JP18 | JP22 |
|--------------------+------------------+--------------------|
| Normal | Closed | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| Weitek P9000 | Open | pins 2 & 3 closed |
+------------------------------------------------------------+