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# UNIDENTIFIED
MS-4109
Processor 80486SX/80487SX/80486DX
Processor Speed 16/20/25/33/50MHz
Chip Set Contaq
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J3 pins | Reset switch | J3 pins |
| keylock | 1 - 5 | | 19 - 20 |
|---------------+----------+----------------------+----------|
| Speaker | J3 pins | Auxiliary keyboard | J4 |
| | 7 - 10 | connector | |
|---------------+----------+----------------------+----------|
| Turbo LED | J3 pins | External battery | JP2 |
| | 12 - 13 | | |
|---------------+----------+----------------------+----------|
| Turbo switch | J3 pins | | |
| | 15 - 17 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | Monitor type select monochrome | JP1 | Open |
|---+--------------------------------+--------+--------------|
| | Monitor type select CGA | JP1 | Closed |
|---+--------------------------------+--------+--------------|
| » | Battery type select internal | JP2 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Battery type select external | JP2 | pins 1 & 4 |
| | | | 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) 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 |
|------------------+--------------------+--------------------|
| 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 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 |
|---------------+--------------------------------------------|
| 64KB | pins 1 & 5, 3 & 7, 9 & 13, 11 & 15 closed |
|---------------+--------------------------------------------|
| 256KB | pins 2 & 6, 4 & 8, 10 & 14, 12 & 16 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP7 |
|---------------+--------------------------------------------|
| 80486SX | pins 2 & 6, 4 & 8, 10 & 14, 12 & 16 closed |
|---------------+--------------------------------------------|
| 80487SX | pins 1 & 2, 3 & 4, 9 & 10, 11 & 12 closed |
|---------------+--------------------------------------------|
| 80486DX | pins 1 & 2, 3 & 4, 13 & 14, 15 & 16 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP9 |
|----------------------------+-------------------------------|
| 16MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 20MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 25MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 50MHz | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 | JP5 | JP6 |
|----------------------+-------------------+--------+--------|
| 16MHz (asynchronous) | pins 2 & 3 closed | Open | Open |
|----------------------+-------------------+--------+--------|
| 20MHz (synchronous) | pins 1 & 2 closed | Open | Open |
|----------------------+-------------------+--------+--------|
| 25MHz (synchronous) | pins 1 & 2 closed | Closed | Open |
|----------------------+-------------------+--------+--------|
| 33MHz (synchronous) | pins 1 & 2 closed | Open | Closed |
|----------------------+-------------------+--------+--------|
| 50MHz (synchronous) | pins 1 & 2 closed | Closed | Closed |
+------------------------------------------------------------+