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# UNIDENTIFIED
486L
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/50MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options Local bus slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J1 | Reset switch | J16 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J13 | Turbo LED | J17 |
|---------------------+----------+----------------+----------|
| Speaker | J14 | Local bus slot | SL1 |
|---------------------+----------+----------------+----------|
| Turbo switch | J15 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery type select internal | J1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | J1 | Closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | J2 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | J2 | Open |
|---+----------------------------------+--------+------------|
| » | ATCLK select CLKI/6 | J3 | Closed |
|---+----------------------------------+--------+------------|
| | ATCLK select CLKI/4 | J3 | Open |
|---+----------------------------------+--------+------------|
| | Phase frequency select single | J6 | pins 1 & 2 |
| | phase | | closed |
|---+----------------------------------+--------+------------|
| | Phase frequency select double | J6 | pins 2 & 3 |
| | phase | | 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 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 0 | TAG 1 |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 16K x |
| | | | | 4 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | (1) 16K x |
| | | | | 4 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | (1) 16K x |
| | | 8 | 8 | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J4 | J5 | J10 | J12 |
|---------+----------+---------+-------------------+---------|
| 64KB | Open | Open | pins 2 & 3 closed | Open |
|---------+----------+---------+-------------------+---------|
| 128KB | Open | Closed | pins 1 & 2 closed | Closed |
|---------+----------+---------+-------------------+---------|
| 256KB | Closed | Closed | pins 2 & 3 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J7 | J8 | JP10 |
|----------+-------------------+---------+-------------------|
| 80486SX | pins 2 & 3 closed | Open | Open |
|----------+-------------------+---------+-------------------|
| 80487SX | pins 1 & 2 closed | Closed | Open |
|----------+-------------------+---------+-------------------|
| 80486DX | pins 1 & 2 closed | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHIPSET CONFIGURATION |
|------------------------------------------------------------|
| Type | J9 | J11 |
|------------------+--------------------+--------------------|
| » | 82C495 | pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| » | 82C493 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+