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# UNIDENTIFIED
SI-433C1/SI-450C1
Processor 80486SX/80487SX/80486DX
Processor Speed 16/20/25/33/50MHz
Chip Set Unidentified
Max. Onboard DRAM 32MB
Cache 32/64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | CN3 | Power LED & | CN6 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | CN4 | Speaker | CN7 |
|------------------+----------+-------------------+----------|
| Turbo switch | CN5 | Turbo LED | LED2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Power good signal detect from | JP7 | pins 1 & 2 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP7 | pins 2 & 3 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP17 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP17 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP19 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP19 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP20 | JP21 |
|------------------+--------------------+--------------------|
| Bank 0 | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| Bank 1 | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG | TAG | TAG |
| | | | (U21) | (U22) | (U39) |
|-------+----------+---------+----------+----------+---------|
| 32KB | (4) 8K x | NONE | (1) 4K x | (1) 4K x | NONE |
| | 8 | | 4 | 4 | |
|-------+----------+---------+----------+----------+---------|
| 64KB | (4) 8K x | (4) 8K | (1) 4K x | (1) 4K x | (1) 16K |
| | 8 | x 8 | 4 | 4 | x 4 |
|-------+----------+---------+----------+----------+---------|
| 128KB | (4) 32K | NONE | (1) 16K | (1) 16K | (1) 16K |
| | x 8 | | x 4 | x 4 | x 4 |
|-------+----------+---------+----------+----------+---------|
| 256KB | (4) 32K | (4) 32K | (1) 16K | (1) 16K | (1) 16K |
| | x 8 | x 8 | x 4 | x 4 | x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 |JP10 |JP11 |JP12 |JP13 |JP14 |JP15 |JP16 |
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
| 32KB |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
| 64KB |2 & 3|1 & 2|1 & 2|2 & 3|1 & 2|1 & 2|2 & 3|2 & 3|1 & 2|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|128KB |2 & 3|2 & 3|1 & 2|2 & 3|2 & 3|1 & 2|1 & 2|1 & 2|2 & 3|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|256KB |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP4 | JP5 | JP6 |
|----------+-------------------+---------+-------------------|
| 80486SX | pins 2 & 3 closed | Open | Open |
|----------+-------------------+---------+-------------------|
| 80487SX | pins 1 & 2 closed | Closed | pins 2 & 3 closed |
|----------+-------------------+---------+-------------------|
| 80486DX | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 |
|----------------------------+-------------------------------|
| 16MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 20MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 25MHz | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 50MHz | pins 1 & 2 closed |
+------------------------------------------------------------+