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# AUSTIN COMPUTER SYSTEMS
486 VESA LB WINTOWER
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/66(internal)MHz
Chip Set Micronics
Max. Onboard 64MB
DRAM
Cache None
BIOS Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit external cache memory card slot,
floppy interface, IDE interfaces (2),
parallel port, serial port (2), VESA local
bus slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 2 | J11 | Auxiliary IDE | J30 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Parallel port | J12 | VESA local bus | S1 & S2 |
| | | slots | |
|-------------------+----------+------------------+----------|
| Serial port 1 | J14 | 32-bit external | S3 |
| | | cache memory | |
| | | card | |
|-------------------+----------+------------------+----------|
| Floppy interface | J15 | Reset switch | W15 |
|-------------------+----------+------------------+----------|
| IDE interface | J16 | Turbo LED | W17 |
|-------------------+----------+------------------+----------|
| Auxiliary | J24 | Turbo switch | W18 |
| keyboard | | | |
| connector | | | |
|-------------------+----------+------------------+----------|
| Speaker | J28 | IDE interface | W19 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Power LED & | J29 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CPU type select 80486DX | W13 | pins 1 & 2 |
| | or 80486DX2 | | closed |
|---+---------------------------+---------------+------------|
| | CPU type select 80486SX | W13 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Parallel port select | W16 | pins 2 & 3 |
| | output mode (printer) | | closed |
|---+---------------------------+---------------+------------|
| | Parallel port select | W16 | pins 1 & 2 |
| | input mode (scanner) | | closed |
|---+---------------------------+---------------+------------|
| » | Flash memory type select | W20 | pins 2 & 3 |
| | default | | closed |
|---+---------------------------+---------------+------------|
| | Flash memory type select | W20 | pins 1 & 2 |
| | recovery | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 4M x 9 | (1) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 16M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 9 | (1) 16M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 9 | (1) 4M x 9 | (1) 16M x | NONE |
| | | | 9 | |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 | (1) 16M x |
| | | | | 9 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 16M x 9 | (1) 16M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 9 | (1) 16M x 9 | (1) 16M x | NONE |
| | | | 9 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 9 | (1) 4M x 9 | (1) 16M x | (1) 16M x |
| | | | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 16M x 9 | (1) 16M x 9 | (1) 16M x | NONE |
| | | | 9 | |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 9 | (1) 16M x 9 | (1) 16M x | (1) 16M x |
| | | | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 16M x 9 | (1) 16M x 9 | (1) 16M x | (1) 16M x |
| | | | 9 | 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|-----------+------------+-----------+-----------+-----------|
| 4MB | On | On | On | On |
|-----------+------------+-----------+-----------+-----------|
| 8MB | Off | On | On | On |
|-----------+------------+-----------+-----------+-----------|
| 12MB | On | Off | On | On |
|-----------+------------+-----------+-----------+-----------|
| 16MB | Off | Off | On | On |
|-----------+------------+-----------+-----------+-----------|
| 16MB | On | On | Off | On |
|-----------+------------+-----------+-----------+-----------|
| 20MB | On | On | Off | Off |
|-----------+------------+-----------+-----------+-----------|
| 24MB | On | Off | On | Off |
|-----------+------------+-----------+-----------+-----------|
| 28MB | Off | On | On | Off |
|-----------+------------+-----------+-----------+-----------|
| 32MB | Off | On | Off | On |
|-----------+------------+-----------+-----------+-----------|
| 36MB | On | Off | Off | Off |
|-----------+------------+-----------+-----------+-----------|
| 40MB | Off | Off | On | Off |
|-----------+------------+-----------+-----------+-----------|
| 48MB | On | Off | Off | On |
|-----------+------------+-----------+-----------+-----------|
| 52MB | Off | Off | Off | Off |
|-----------+------------+-----------+-----------+-----------|
| 64MB | Off | Off | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | SW1/5 | SW1/6 | SW1/7 | SW1/8 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | On | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Off | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | On | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Off | On | Off | Off |
+------------------------------------------------------------+