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# UNIDENTIFIED
486/25 MAINBOARD
Processor 80486SX
Processor Speed 25MHz
Chip Set Unidentified
Max. Onboard DRAM None (8MB or 16MB on riser card)
Cache None (8KB is on the CPU)
BIOS Award
Dimensions 330mm x 225mm
I/O Options None
NPU Options 80387DX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | CON1 | Speaker | CON5 |
|------------------+----------+-------------------+----------|
| Turbo LED | CON2 | Power LED & | CON6 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo switch | CON3 | Riser Card | S1 |
|------------------+----------+-------------------+----------|
| Reset switch | CON4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Battery type select | JP1 | pins 2 & 3 |
| | external | | closed |
|---+---------------------------+---------------+------------|
| | Battery type select | JP1 | pins 1 & 2 |
| | internal | | closed |
|---+---------------------------+---------------+------------|
| » | Monitor type select | JP2 | pins 2 & 3 |
| | monochrome | | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select color | JP2 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Power good from mainboard | JP3 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Power good from power | JP3 | pins 1 & 2 |
| | supply | | closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 1MB | (36) 41256 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (36) 41256 | (1) 41256 |
|------------------+--------------------+--------------------|
| 4MB | (36) 41000 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (36) 41000 | (36) 41000 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MEMORY CARD CONFIGURATION |
|------------------------------------------------------------|
| Select | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|--------+--------+--------+--------+--------+-------+-------|
| 1MB | On | On | On | On | On | On |
|--------+--------+--------+--------+--------+-------+-------|
| 2MB | Off | On | On | On | On | Off |
|--------+--------+--------+--------+--------+-------+-------|
| 4MB | Off | Off | On | On | Off | On |
|--------+--------+--------+--------+--------+-------+-------|
| 8MB | Off | Off | Off | On | Off | Off |
|------------------------------------------------------------|
| Note: SW1 is located on the mainboard. |
+------------------------------------------------------------+
IMG IMG 3
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------------------------------------------------------|
| Note: This may be SIMM or SIP |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MEMORY CARD CONFIGURATION |
|------------------------------------------------------------|
| Select | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|--------+--------+--------+--------+--------+-------+-------|
| 1MB | On | On | On | On | On | On |
|--------+--------+--------+--------+--------+-------+-------|
| 2MB | Off | On | On | On | On | Off |
|--------+--------+--------+--------+--------+-------+-------|
| 4MB | Off | Off | On | On | On | Off |
|--------+--------+--------+--------+--------+-------+-------|
| 4MB | Off | Off | On | On | Off | On |
|--------+--------+--------+--------+--------+-------+-------|
| 8MB | Off | Off | Off | On | Off | Off |
|--------+--------+--------+--------+--------+-------+-------|
| 16MB | Off | Off | Off | Off | Off | Off |
|------------------------------------------------------------|
| Note: SW1 is located on the mainboard. |
+------------------------------------------------------------+