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# AUSTIN COMPUTER SYSTEMS
486/SLC 25
Processor 80386SX/CX486SLC
Processor Speed 25MHz
Chip Set C & T
Max. Onboard DRAM 16MB
Cache None
BIOS AMI
Dimensions 220mm x 220mm
I/O Options 16-bit external cache memory card slot
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Speaker | J1 | External battery | J13 |
|---------------+----------+----------------------+----------|
| Turbo switch | J7 | Reset switch | J14 |
|---------------+----------+----------------------+----------|
| Turbo LED | J8 | 16-bit external | S1 |
| | | cache memory card | |
|---------------+----------+----------------------+----------|
| Power LED & | J10 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CPU speed select forced high | J7 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | J12 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | J12 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | J15 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | J15 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Cache card absent | W1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Cache card present | W1 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (2) 256K x | (2) 256K x | (2) 256K x | (2) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 2MB | (2) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 3MB | (2) 256K x | (2) 256K x | (2) 1M x 9 | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (2) 256K x | (2) 256K x | (2) 1M x 9 | (2) 1M x 9 |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|------+-------------+-------------+------------+------------|
| 9MB | (2) 256K x | (2) 256K x | (2) 4M x 9 | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 10MB | (2) 1M x 9 | (2) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION FOR CACHE CARD |
|------------------------------------------------------------|
| Size | J2 | J3 | J4 | J5 | J6 |
|--------------------+-------+-------+-------+-------+-------|
| 64KB/2-Way Set | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
| Associative | | | | | |
|--------------------+-------+-------+-------+-------+-------|
| 64KB/Directly | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
| Mapped | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+