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# UNIDENTIFIED
80386 SX
Processor 80386SX
Processor Speed 16/20MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard Memory 4MB
Maximum Video Memory None
Cache None
BIOS AMI
Dimensions 330mm x 217mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Turbo LED | JP1 | Turbo switch | JP4 |
|----------------+----------+---------------------+----------|
| Speaker | JP2 | Power LED & keylock | JP5 |
|----------------+----------+---------------------+----------|
| Reset switch | JP3 | External battery | JP15 |
|------------------------------------------------------------|
| Note: JP4 may be a 2-pin jumper. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | ROM wait state select 2 wait | J1 | Pins 2 & 3 |
| | states (16MHz CPU) | | closed |
|---+-----------------------------------+-------+------------|
| | ROM wait state select 3 wait | J1 | Pins 1 & 2 |
| | states (20MHz CPU) | | closed |
|---+-----------------------------------+-------+------------|
| | Turbo enabled | JP4 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Turbo disabled | JP4 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | NPU not installed | JP6 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | NPU installed | JP6 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Parity disabled | JP7 | Open |
|---+-----------------------------------+-------+------------|
| | Parity enabled | JP7 | Closed |
|---+-----------------------------------+-------+------------|
| | RAM wait state select 0 wait | JP8 | Pins 1 & 2 |
| | states (only if JP9 is open) | | closed |
|---+-----------------------------------+-------+------------|
| | RAM wait state select 1 wait | JP8 | Pins 2 & 3 |
| | state (only if JP9 is open) | | closed |
|---+-----------------------------------+-------+------------|
| | JP8 enabled | JP9 | Open |
|---+-----------------------------------+-------+------------|
| | 8042 keyboard controller pin 29 | JP9 | Closed |
|---+-----------------------------------+-------+------------|
| ยป | Factory configured - do not alter | JP10 | Open |
| | (for AMI BIOS & 8042) | | |
|---+-----------------------------------+-------+------------|
| | Monitor type select color | JP11 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | JP11 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Power good signal detect from | JP13 | Pins 2 & 3 |
| | power supply | | closed |
|---+-----------------------------------+-------+------------|
| | Power good signal detect from | JP13 | Pins 1 & 2 |
| | board | | closed |
|---+-----------------------------------+-------+------------|
| | 12v battery charge disabled | JP14 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | 12v battery charge enabled | JP14 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 512KB | (18) 41256 | None |
|------------------+--------------------+--------------------|
| 640KB | (18) 41256 | (18) 4164 |
|------------------+--------------------+--------------------|
| 1MB | (18) 41256 | (18) 41256 |
|------------------+--------------------+--------------------|
| 2MB | (18) 411000 | None |
|------------------+--------------------+--------------------|
| 4MB | (18) 411000 | (18) 411000 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J3 |
|----------------------------+-------------------------------|
| 512KB | Pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 640KB | Pins 2 & 4, 3 & 5 closed |
|----------------------------+-------------------------------|
| 1MB | Pins 3 & 5, 4 & 6 closed |
|----------------------------+-------------------------------|
| 2MB | Pins 1 & 3, 4 & 6 closed |
|----------------------------+-------------------------------|
| 4MB | Pins 1 & 3, 4 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J2 |
|----------------------------+-------------------------------|
| 16MHz | Pins 3 & 4, 7 & 8 closed |
|----------------------------+-------------------------------|
| 20MHz | Pins 3 & 4, 5 & 6 closed |
+------------------------------------------------------------+