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# ASUS COMPUTER INTERNATIONAL
EISA-486A/EISA-486E
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/50MHz
Chip Set Intel
Max. Onboard DRAM 64MB
Cache 64/128/256KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Reset switch | CON2 | Speaker | CON5 |
|----------------+----------+---------------------+----------|
| Turbo switch | CON3 | Power LED & keylock | CON6 |
|----------------+----------+---------------------+----------|
| Turbo LED | CON4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+--------+-----------|
| » | Monitor type select monochrome | JP1 | pins 1 & |
| | | | 2 closed |
|---+-----------------------------------+--------+-----------|
| | Monitor type select color | JP1 | pins 2 & |
| | | | 3 closed |
|---+-----------------------------------+--------+-----------|
| » | Factory configured - do not alter | JP2 | N/A |
|---+-----------------------------------+--------+-----------|
| » | Power good signal detect from | JP3 | pins 2 & |
| | power supply (EISA-486E) | | 3 closed |
|---+-----------------------------------+--------+-----------|
| | Power good signal detect from | JP3 | pins 1 & |
| | board (EISA-486E) | | 2 closed |
|---+-----------------------------------+--------+-----------|
| » | Factory configured - do not alter | JP5 | N/A |
|---+-----------------------------------+--------+-----------|
| » | Factory configured - do not alter | JP5 | N/A |
|---+-----------------------------------+--------+-----------|
| » | CPU is asynchronous with | JP100 | pins 2 & |
| | oscillator installed at Y1 | | 3 closed |
| | (EISA-486A) | | |
|---+-----------------------------------+--------+-----------|
| | CPU is synchronous with | JP100 | pins 1 & |
| | oscillator installed at Y1 | | 2 closed |
| | (EISA-486A) | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (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 | (2) 16K x 4 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (2) 64K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 64K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE RESISTOR CONFIGURATION |
|------------------------------------------------------------|
| Size | R1 | R2 | R3 |
|------------+---------------+---------------+---------------|
| 64KB | Installed | Not installed | Not installed |
|------------+---------------+---------------+---------------|
| 128KB | Not installed | Installed | Not installed |
|------------+---------------+---------------+---------------|
| 256KB | Not installed | Not installed | Installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Size | JP4 |
|------------------------------+-----------------------------|
| 20MHz | Closed |
|------------------------------+-----------------------------|
| 25MHz | Closed |
|------------------------------+-----------------------------|
| 33MHz | Open |
|------------------------------+-----------------------------|
| 50MHz | Open |
+------------------------------------------------------------+