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# UNIDENTIFIED
486SC-H
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50(internal)MHz
Chip Set Unidentified
Max. Onboard DRAM 32MB
Cache 32/128KB
BIOS AMI
Dimensions 220mm x 220mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Turbo LED | J1 | Speaker | J4 |
|----------------+----------+---------------------+----------|
| Turbo switch | J2 | Power LED & keylock | J5 |
|----------------+----------+---------------------+----------|
| Reset switch | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CPU clock speed select 1x | J8 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU clock speed select 2x | J8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select | J9 | Open |
| | monochrome/EGA/VGA | | |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J9 | Closed |
|---+----------------------------------+--------+------------|
| » | Cache wait state select 1 wait | J12 | Open |
| | state | | |
|---+----------------------------------+--------+------------|
| | Cache wait state select 0 wait | J12 | pins 3 & 4 |
| | states | | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 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 |
|------------------+--------------------+--------------------|
| 32KB | (4) 8K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 8K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 | JS3 | JS4 |
|-------+-------------+------------+------------+------------|
| 32KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J7 |
|----------------------------+-------------------------------|
| 80486SX | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 80487SX | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 80486DX | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 80486DX2 | pins 2 & 3 closed |
+------------------------------------------------------------+