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# ASUS COMPUTER INTERNATIONAL
ISA 486S
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33MHz
Chip Set Symphony Haydn
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------+----------+------------------------+----------|
| Power LED & | CON1 | Turbo switch | CON4 |
| keylock | | | |
|-------------+----------+------------------------+----------|
| Speaker | CON2 | Reset switch | CON5 |
|-------------+----------+------------------------+----------|
| Turbo LED | CON3 | 32-bit external memory | S1 |
| | | card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Power good signal detect from | JP1 | pins 2 & 3 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP1 | pins 1 & 2 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP5 | pins 2 & 3 |
| | or other than CGA | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select CGA | JP5 | pins 1 & 2 |
| | | | 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) 1M x 9 | (4) 256K x 9 |
|-------------+------------------------+---------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|-------------+------------------------+---------------------|
| 16MB | (4) 4M x 9 | NONE |
|-------------+------------------------+---------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|-------------+------------------------+---------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|-------------+------------------------+---------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note:Onboard memory and external memory are independent |
| and may be used in any combination. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL MEMORY CARD 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG (U27) | TAG (U28) |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 8K x 8 | (1) 8K x 8 |
| | | 8 | | |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | NONE |
| | | 8 | 8 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | TP7 | RB1 & RB2 |
|------------------+--------------------+--------------------|
| 64KB | pins 2 & 3 closed | Position 1 |
|------------------+--------------------+--------------------|
| 128KB | pins 1 & 2 closed | Position 2 |
|------------------+--------------------+--------------------|
| 256KB | pins 2 & 3 closed | Position 3 |
|------------------------------------------------------------|
| Note:Location of TP7 is unverified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
|---------+--------+--------+--------+-------+-------+-------|
| 80486SX | Off | Off | Off | Off | On | On |
|---------+--------+--------+--------+-------+-------+-------|
| 80487SX | On | On | On | Off | Off | Off |
|---------+--------+--------+--------+-------+-------+-------|
| 80486DX | On | On | On | Off | Off | Off |
+------------------------------------------------------------+