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# ASUS COMPUTER INTERNATIONAL
ISA-486SIQ
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 220mm x 240mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Reset | CON1 | Turbo LED | CON4 |
|---------------------+----------+----------------+----------|
| Speaker | CON2 | Turbo switch | CON5 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | CON3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CPU speed select 25/33/50MHz | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CPU speed select 20MHz | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select monochrome | JP2 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select color | JP2 | 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | Jumper CJ1 | Jumper CJ2 | Jumper CJ3 |
|-------+-------------------+-------------------+------------|
| 64KB | pins 1 & 2 closed | pins 1 & 2 closed | open |
|-------+-------------------+-------------------+------------|
| 128KB | pins 2 & 3 closed | open | closed |
|-------+-------------------+-------------------+------------|
| 256KB | pins 2 & 3 closed | pins 2 & 3 closed | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU JUMPER CONFIGURATION |
|------------------------------------------------------------|
| CPU | Jumper CPJ1 | Jumper CPJ2 | Jumper CPJ3 |
|---------+--------------+--------------------+--------------|
| 80486DX | pins 2 & 3 | pins 1 & 2 and 3 & | pins 2 & 3 |
| | closed | 4 closed | closed |
|---------+--------------+--------------------+--------------|
| 80487SX | pins 1 & 2 | pins 1 & 2 and 3 & | pins 1 & 2 |
| | closed | 4 closed | closed |
|---------+--------------+--------------------+--------------|
| 80486SX | open | pins 2 & 3 closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+