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# SHUTTLE COMPUTER INTERNATIONAL, INC.
80386SX-20 CACHE MAINBOARD
Processor 80386SX
Processor Speed 20MHz
Chip Set OPTI
Max. Onboard DRAM 16MB
Cache 64KB
BIOS AMI
Dimensions 248mm x 330mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Turbo LED | JP8 | Reset switch | S2 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J22 | Turbo switch | S3 |
|---------------------+----------+----------------+----------|
| Speaker | J21 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP2 | Closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP2 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 512KB | (2) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 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 |
|-------+-------------+------------+------------+------------|
| 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 CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 16KB | (4) 4K x 8 | (4) 4K x 8 | (3) 16K x 4 |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | NONE | (3) 16K x 4 |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (3) 16K x 4 |
|------------------------------------------------------------|
| Note:The location of the cache is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP5 | JP6 | JP7 |
|---------+----------+----------+--------+---------+---------|
| 16KB | 1 & 2 | 1 & 2 | 1 & 2 | Open | Open |
|---------+----------+----------+--------+---------+---------|
| 32KB | 2 & 3 | 1 & 2 | 1 & 2 | Closed | Open |
|---------+----------+----------+--------+---------+---------|
| 64KB | 2 & 3 | 2 & 3 | 2 & 3 | Open | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+