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# UNIDENTIFIED
80486
Processor 80486SX/80487SX/ODP486SX/80486DX/80486DX2
Processor Speed 20/25/33/40/50(internal)/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache None
BIOS AMI
Dimensions 254mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J17 | External battery | J20 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J18 | Turbo switch | J21 |
|-------------------+----------+------------------+----------|
| Reset switch | J19 | Turbo LED | J22 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CPU type select PGA or PQFP | J23 | Open |
| | installed | | |
|---+----------------------------------+--------+------------|
| | CPU type select PQFP disabled & | J23 | Closed |
| | PGA enabled | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP3 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select | JP3 | Closed |
| | color/EGA/VGA | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP5 | pins 2 & 3 |
| | | | 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 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP101 | JP102 | JP103 | JP104 |
|-------------+--------+------------+------------+-----------|
| 80486SX | Open | pins 2 & 3 | Open | pins 2 & |
| | | closed | | 3 closed |
|-------------+--------+------------+------------+-----------|
| 80487SX | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 & |
| | | closed | closed | 3 closed |
|-------------+--------+------------+------------+-----------|
| ODP486SX | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 & |
| | | closed | closed | 3 closed |
|-------------+--------+------------+------------+-----------|
| 80486DX/DX2 | Closed | pins 1 & 2 | pins 1 & 2 | pins 2 & |
| | | closed | closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J24 | J25 | J26 |
|---------------+--------------+--------------+--------------|
| 20MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Open |
+------------------------------------------------------------+