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# UNIDENTIFIED
386SXC-990-B
Processor 80386SX
Processor Speed 20MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 16MB
Maximum Video Memory None
Cache 32/64KB
BIOS AMI/Award
Dimensions 324mm x 222mm
I/O Options None
NPU Options 80387SX
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Power LED & keylock | H1 | Speaker | H3 |
|---------------------+----------+----------------+----------|
| Reset switch | H2 | Turbo LED | H6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------------+---------+-----------|
| | Monitor type select color | H5 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | H5 | Open |
|---+----------------------------------+---------+-----------|
| | NPU not installed | JP21 | Closed |
|---+----------------------------------+---------+-----------|
| | NPU installed | JP21 | 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 | | |
|--------+------------+------------+------------+------------|
| 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 |
|--------+------------+------------+------------+------------|
| 2.5MB | (2) 1M x 9 | (2) 256K x | None | None |
| | | 9 | | |
|--------+------------+------------+------------+------------|
| 3MB | (2) 1M x 9 | (2) 256K x | (2) 256K x | None |
| | | 9 | 9 | |
|--------+------------+------------+------------+------------|
| 3.5MB | (2) 1M x 9 | (2) 256K x | (2) 256K x | (2) 256K x |
| | | 9 | 9 | 9 |
|--------+------------+------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | None | None |
|--------+------------+------------+------------+------------|
| 4.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | None |
| | | | 9 | |
|--------+------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x | (2) 256K x |
| | | | 9 | 9 |
|--------+------------+------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | None |
|--------+------------+------------+------------+------------|
| 6.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x |
| | | | | 9 |
|--------+------------+------------+------------+------------|
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|--------+------------+------------+------------+------------|
| 8MB | (2) 4M x 9 | None | None | None |
|--------+------------+------------+------------+------------|
| 8.5MB | (2) 4M x 9 | (2) 256K x | None | None |
| | | 9 | | |
|--------+------------+------------+------------+------------|
| 9MB | (2) 4M x 9 | (2) 256K x | (2) 256K x | None |
| | | 9 | 9 | |
|--------+------------+------------+------------+------------|
| 9.5MB | (2) 4M x 9 | (2) 256K x | (2) 256K x | (2) 256K x |
| | | 9 | 9 | 9 |
|--------+------------+------------+------------+------------|
| 10MB | (2) 4M x 9 | (2) 1M x 9 | None | None |
|--------+------------+------------+------------+------------|
| 10.5MB | (2) 4M x 9 | (2) 1M x 9 | (2) 256K x | None |
| | | | 9 | |
|--------+------------+------------+------------+------------|
| 11MB | (2) 4M x 9 | (2) 1M x 9 | (2) 256K x | (2) 256K x |
| | | | 9 | 9 |
|--------+------------+------------+------------+------------|
| 12MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | |
|--------+------------+------------+------------+------------|
| 12.5MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x |
| | | | | 9 |
|--------+------------+------------+------------+------------|
| 14MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|--------+------------+------------+------------+------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 | None | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 32KB | (4) 8K x 8 | None |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP2 |
|----------------------------+-------------------------------|
| 32KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 64KB | Pins 2 & 3 closed |