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# ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.
386SX-16-20-25
Processor 80386SX
Processor Speed 16/20/25MHz
Chip Set None
Max. Onboard DRAM 8MB
Cache None
BIOS Quadtel
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | X6 | Power LED & | X14 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Turbo LED | X11 | Status display | X17 |
|------------------+----------+-------------------+----------|
| Reset switch | X12 | Speaker | X21 |
|------------------+----------+-------------------+----------|
| Turbo switch | X13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Battery installed < 5VDC | S1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Battery installed > 5VDC | S1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | CPU speed select | S2 | pins 2 & 3 |
| | switchable at keyboard | | closed |
|---+---------------------------+---------------+------------|
| | CPU speed select | S2 | pins 1 & 2 |
| | switchable at turbo | | closed |
| | switch | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/1 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | NPU enabled | SW1/2 | Off |
|---+---------------------------+---------------+------------|
| | NPU disabled | SW1/2 | On |
|---+---------------------------+---------------+------------|
| » | Normal CPU speed during | SW1/3 | Off |
| | floppy operations | | |
|---+---------------------------+---------------+------------|
| | Slow CPU speed to 8MHz | SW1/3 | On |
| | during floppy operations | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/4 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | SW1/4 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/5 | N/A |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 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 |
|------+-------------+-------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | Banks used | SW1/6 | SW1/7 | SW1/8 |
|----------+-------------+-----------+-----------+-----------|
| 1MB | 0 & 1 | On | On | On |
|----------+-------------+-----------+-----------+-----------|
| 2MB | 0, 1, 2 & 3 | On | Off | On |
|----------+-------------+-----------+-----------+-----------|
| 2MB | 0 | On | Off | Off |
|----------+-------------+-----------+-----------+-----------|
| 4MB | 0 & 1 | Off | On | On |
|----------+-------------+-----------+-----------+-----------|
| 6MB | 0, 1 & 2 | Off | Off | On |
|----------+-------------+-----------+-----------+-----------|
| 8MB | 0, 1, 2 & 3 | Off | Off | Off |
+------------------------------------------------------------+