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# SILICON STAR INTERNATIONAL, INC.
486SX-AR4
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33MHz
Chip Set Acer
Max. Onboard DRAM 32MB
Cache None
BIOS AMI
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 |
|-------------------------------------+--------+-------------|
| » | Monitor type select color | JP1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+--------+-------------|
| » | Real time clock select MC146818 | JP2 | Open |
|---+---------------------------------+--------+-------------|
| | Real time clock select DS1287 | JP2 | 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 TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP4 | JP5 |
|------------------+--------------------+--------------------|
| 80486SX | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80487SX | Open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 | JP6 |
|------------------+--------------------+--------------------|
| CLK2/5 | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| CLK2/6 | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| CLK2/8 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+