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# ASUS COMPUTER INTERNATIONAL
ISA-486SV2 (VERSION 2.5)
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 230mm x 218mm
I/O Options None
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | BCON1 | Reset switch | CON3 |
|------------------+----------+-------------------+----------|
| Turbo switch | CON1 | Speaker | CON4 |
|------------------+----------+-------------------+----------|
| Turbo LED | CON2 | Power LED & | CON5 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Battery select internal | BJP1 | Closed |
|---+----------------------------------+--------+------------|
| | Battery select external | BJP1 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select | JP2 | pins 1 & 2 |
| | monochrome/color | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select CGA | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP7 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP8 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP9 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP10 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP11 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP13 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP14 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | TP15 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | CJ1 | CJ2 | CJ3 |
|---------+-------------------+-------------------+----------|
| 64KB | pins 2 & 3 closed | pins 2 & 3 closed | Open |
|---------+-------------------+-------------------+----------|
| 128KB | pins 1 & 2 closed | Open | Closed |
|---------+-------------------+-------------------+----------|
| 256KB | pins 1 & 2 closed | pins 1 & 2 closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | CPJ1 | CPJ2 | CPJ3 |
|-----------+-------------+--------------------+-------------|
| 80486SX | Open | pins 1 & 2 closed | pins 2 & 3 |
| | | | closed |
|-----------+-------------+--------------------+-------------|
| 80487SX | pins 1 & 2 | pins 1 & 2 and 3 & | pins 1 & 2 |
| | closed | 4 | closed |
|-----------+-------------+--------------------+-------------|
| 80486DX | pins 2 & 3 | pins 1 & 2 and 3 & | pins 2 & 3 |
| | closed | 4 | closed |
|-----------+-------------+--------------------+-------------|
| ODP486SX | pins 1 & 2 | pins 1 & 2 and 3 & | pins 1 & 2 |
| | closed | 4 | closed |
|-----------+-------------+--------------------+-------------|
| 80486DX2 | pins 2 & 3 | pins 1 & 2 and 3 & | pins 2 & 3 |
| | closed | 4 | closed |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | CS1 | CS2 | CS3 | JP1 |
|--------+------------+------------+------------+------------|
| 20MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 25MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 33MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 40MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50iMHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 66iMHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+