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# SILICON VALLEY COMPUTER, INC.
486WB
Processor 80486DX
Processor Speed 33/50MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS C & T
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J10 | 32-bit external | S1 |
| | | memory card | |
|------------------+----------+-------------------+----------|
| Power LED & | J23 | Reset switch | SW1 |
| keylock | | | |
|------------------+----------+-------------------+----------|
| Speaker | J24 | Turbo switch | SW2 |
|------------------+----------+-------------------+----------|
| Turbo LED | JP12 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select CGA | JP1 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome, | JP1 | Open |
| | EGA, or VGA | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Bus speed select ATCLK/4 | JP3 | Closed |
|---+----------------------------------+--------+------------|
| | Bus speed select ATCLK/6 | JP3 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP7 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG (U33) | TAG (U34) |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | (1) 64K x 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 8K x 8 | (1) 64K x 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 |
|-----------+------------+-----------+-----------+-----------|
| 64KB | Open | Open | Open | Open |
|-----------+------------+-----------+-----------+-----------|
| 256KB | Closed | Closed | Closed | Closed |
+------------------------------------------------------------+