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# UNIDENTIFIED
80386SX-20/25
Processor 80386SX
Processor Speed 16/20/25MHz
Chip Set C & T
Max. Onboard DRAM 16MB (8MB on external memory card)
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card
NPU Options 80287/80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J17 | Turbo LED | J22 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J18 | External battery | JP30 |
|---------------+----------+----------------------+----------|
| Reset switch | J19 | 32-bit external | SL1 |
| | | memory card | |
|---------------+----------+----------------------+----------|
| Turbo switch | J21 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+--------+--------------|
| » | NPU disabled (80287) | JP1 | Open |
|---+--------------------------------+--------+--------------|
| | NPU enabled (80287) | JP1 | Closed |
|---+--------------------------------+--------+--------------|
| » | Monitor type select color | JP3 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| | Monitor type select monochrome | JP3 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+--------+--------------|
| » | CMOS memory normal operation | JP31 | Open |
|---+--------------------------------+--------+--------------|
| | CMOS memory clear | JP31 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Parity 0 | Bank 1 | Parity 1 |
|--------+------------+------------+------------+------------|
| 1MB | (36) 41256 | (3) 41256 | NONE | (3) 41256 |
|--------+------------+------------+------------+------------|
| 2MB | (36) 41256 | (3) 41256 | (36) 41256 | (3) 41256 |
|--------+------------+------------+------------+------------|
| 4MB | (36) 44256 | (3) 41256 | NONE | (3) 41256 |
|--------+------------+------------+------------+------------|
| 8MB | (36) 44256 | (3) 41256 | (36) 44256 | (3) 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NUMERIC COPROCESSOR CONFIGURATION (80387) |
|------------------------------------------------------------|
| Setting | JP11 | JP12 |
|--------------------+-------------------+-------------------|
| Not installed | Open | Open |
|--------------------+-------------------+-------------------|
| Installed | Closed | Closed |
+------------------------------------------------------------+