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# UNIDENTIFIED
80486SX/DX MOTHERBOARD
Processor 80486SX/80487SX/80486DX
Processor Speed 16/20/25/33MHz
Chip Set Acer
Max. Onboard DRAM 32MB
SRAM Cache None
BIOS AMI/AWARD
Dimensions 230mm x 220mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+------------------+-----------|
| External battery | J4 | Turbo LED | J21/pins |
| | | | 1 & 2 |
|------------------+----------+------------------+-----------|
| Reset switch | J19 | Turbo switch | J21/pins |
| | | | 4 & 5 |
|------------------+----------+------------------+-----------|
| Speaker | J20 | Power LED & | J22 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| ยป | Monitor type select color | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP1 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Jumper | OSC1/5 | OSC1/6 | OSC1/8 |
|--------+-----------------+----------------+----------------|
| JP3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| JP6 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | 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 |
|-----------+------------------------+-----------------------|
| 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 JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP4 | JP5 |
|------------------+--------------------+--------------------|
| 80486SX | open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+