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# CACHE COMPUTERS, INC.
SX 386-20 (Model 308)
Processor 80386SX
Processor Speed 16/20MHz
Chip Set VIA
Max. Onboard DRAM 8MB
Cache None
BIOS AMI/Award/Phoenix/Quadtel
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+-----------+-------------------+----------|
| Turbo switch | J3 | External battery | J8 |
|-----------------+-----------+-------------------+----------|
| Turbo LED | J6 | Speaker | J11 |
|-----------------+-----------+-------------------+----------|
| Power LED & | J7 | Reset switch | SW3 |
| keylock | | | |
|------------------------------------------------------------|
| Note:The location of the expansion slots is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CPU speed select 20MHz | J1 | Open |
|---+---------------------------+---------------+------------|
| | CPU speed select 16MHz | J1 | Closed |
|---+---------------------------+---------------+------------|
| » | NPU disabled | J2 | Closed |
|---+---------------------------+---------------+------------|
| | NPU enabled | J2 | Open |
|---+---------------------------+---------------+------------|
| » | Monitor type select | J4 | Open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | J4 | Closed |
|---+---------------------------+---------------+------------|
| » | DMA speed select 8/10MHz | J99 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | DMA speed select 4MHz | J99 | Closed |
|---+---------------------------+---------------+------------|
| | DMA speed select | J99 | pins 1 & 2 |
| | synchronous with CPU | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW2/5 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW2/6 | Off |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | | |
|-------+-------------+------------+------------+------------|
| 1.5MB | (2) 256K x | (2) 256K x | (2) 256K x | NONE |
| | 9 | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER/SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | J10 | J13 | SW2/1 | SW2/2 | SW2/3 | SW2/4 |
|--------+-------+-------+--------+--------+--------+--------|
| 512KB | 2 & 3 | 2 & 3 | Off | Off | Off | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 1MB | 2 & 3 | 2 & 3 | On | Off | Off | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 1.5MB | 2 & 3 | 2 & 3 | Off | On | Off | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 2MB | 2 & 3 | 2 & 3 | On | On | Off | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 2MB | 1 & 2 | 1 & 2 | Off | Off | On | On |
|--------+-------+-------+--------+--------+--------+--------|
| 3MB | 2 & 3 | 1 & 2 | Off | On | On | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 4MB | 1 & 2 | 1 & 2 | On | Off | On | On |
|--------+-------+-------+--------+--------+--------+--------|
| 5MB | 2 & 3 | 1 & 2 | On | On | On | Off |
|--------+-------+-------+--------+--------+--------+--------|
| 6MB | 1 & 2 | 1 & 2 | Off | On | On | On |
|--------+-------+-------+--------+--------+--------+--------|
| 8MB | 1 & 2 | 1 & 2 | On | On | On | On |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Read States | Write States | SW2/7 | SW2/8 |
|---------------+---------------+--------------+-------------|
| NONE | NONE | Off | On |
|---------------+---------------+--------------+-------------|
| 1 | 1 | Off | Off |
|---------------+---------------+--------------+-------------|
| 1 | 2 | On | Off |
|---------------+---------------+--------------+-------------|
| 2 | 2 | On | On |
+------------------------------------------------------------+