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# UNIDENTIFIED
486SX/DX/DX2
Processor 80486SX/80487SX/ODP80486SX/80486DX/80486DX2
Processor Speed 16/20/25/33/50/55i/66iMHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/128KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J1 | Turbo LED | J4 |
|---------------------+----------+----------------+----------|
| Speaker | J2 | Turbo switch | J5 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J3 | Reset switch | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | JP1 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP1 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP8 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Power on clock select CLKI/4 | JP9 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Power on clock select CLKI/6 | JP9 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP12 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG0 | TAG1 |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 16K x |
| | | | | 4 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 16K x |
| | | 8 | | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 | JP3 | JP7 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP13 | JP14 |
|------------------+--------------------+--------------------|
| 80486SX | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP11 |
|----------------------------+-------------------------------|
| 25MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 40MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 50iMHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 66iMhz | pins 2 & 3 closed |
+------------------------------------------------------------+