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# UNIDENTIFIED
P386 MAINBOARD
Processor 80386
Processor Speed 20/25MHz
Chip Set C & T
Video Chip Set None
Maximum Onboard Memory 16MB (8 MB on external memory card)
Maximum Video Memory None
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options External memory card
NPU Options 80287/80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| Auxiliary keyboard | J2 | Turbo LED | J16 |
| connector | | | |
|--------------------+----------+-----------------+----------|
| External battery | J3 | Speaker | J17 |
|--------------------+----------+-----------------+----------|
| Reset switch | J10 | Power LED & | J18 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Turbo switch | J15 | External memory | SL1 |
| | | card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|------------------------------------+-------+---------------|
| ยป | CMOS memory normal operation | J4 | Open |
|---+--------------------------------+-------+---------------|
| | CMOS memory clear | J4 | Closed |
|---+--------------------------------+-------+---------------|
| | Monitor type select color | J5 | Pins 1 & 2 |
| | | | closed |
|---+--------------------------------+-------+---------------|
| | Monitor type select monochrome | J5 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Start | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
| | Bank | | | | |
|---------+-------+------------+---------+---------+---------|
| 1MB (A) | SIP | (4) 256K x | None | None | None |
| | | 9 | | | |
|---------+-------+------------+---------+---------+---------|
| 1MB (B) | DIP | None | None | (8) | None |
| | | | | 44256 | |
|---------+-------+------------+---------+---------+---------|
| 2MB (A) | SIP | (4) 256K x | (4) | None | None |
| | | 9 | 256K x | | |
| | | | 9 | | |
|---------+-------+------------+---------+---------+---------|
| 2MB (B) | DIP | None | None | (8) | (8) |
| | | | | 44256 | 44256 |
|---------+-------+------------+---------+---------+---------|
| 4MB (A) | SIP | (4) 256K x | (4) | (8) | (8) |
| | | 9 | 256K x | 44256 | 44256 |
| | | | 9 | | |
|---------+-------+------------+---------+---------+---------|
| 4MB (B) | DIP | (4) 256K x | (4) | (8) | (8) |
| | | 9 | 256K x | 44256 | 44256 |
| | | | 9 | | |
|---------+-------+------------+---------+---------+---------|
| 4MB (C) | SIP | (4) 1M x 9 | None | None | None |
|---------+-------+------------+---------+---------+---------|
| 8MB | SIP | (4) 1M x 9 | (4) 1M | None | None |
| | | | x 9 | | |
|---------+-------+------------+---------+---------+---------|
| 10MB | SIP | (4) 1M x 9 | (4) 1M | (8) | (8) |
| (A) | | | x 9 | 44256 | 44256 |
|---------+-------+------------+---------+---------+---------|
| 10MB | DIP | (4) 1M x 9 | (4) 1M | (8) | (8) |
| (B) | | | x 9 | 44256 | 44256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM PARITY CONFIGURATION |
|------------------------------------------------------------|
| Size | Start Bank | P 2 | P 3 |
|--------------+---------------+--------------+--------------|
| 1MB (A) | SIP | None | None |
|--------------+---------------+--------------+--------------|
| 1MB (B) | DIP | (4) 41256 | None |
|--------------+---------------+--------------+--------------|
| 2MB (A) | SIP | None | None |
|--------------+---------------+--------------+--------------|
| 2MB (B) | DIP | (4) 41256 | (4) 41256 |
|--------------+---------------+--------------+--------------|
| 4MB (A) | SIP | (4) 41256 | (4) 41256 |
|--------------+---------------+--------------+--------------|
| 4MB (B) | DIP | (4) 41256 | (4) 41256 |
|--------------+---------------+--------------+--------------|
| 4MB (C) | SIP | None | None |
|--------------+---------------+--------------+--------------|
| 8MB | SIP | None | None |
|--------------+---------------+--------------+--------------|
| 10MB (A) | SIP | (4) 41256 | (4) 41256 |
|--------------+---------------+--------------+--------------|
| 10MB (B) | DIP | (4) 41256 | (4) 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J6 | J7 | J8 | J9 |
|----------+--------------+------------+----------+----------|
| 1MB (A) | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 1MB (B) | 2 & 3, 4 & 5 | 2 & 3, 4 & | 2 & 3, 4 | 2 & 3, 4 |
| | | 5 | & 5 | & 5 |
|----------+--------------+------------+----------+----------|
| 2MB (A) | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 2MB (B) | 2 & 3, 4 & 5 | 2 & 3, 4 & | 2 & 3, 4 | 2 & 3, 4 |
| | | 5 | & 5 | & 5 |
|----------+--------------+------------+----------+----------|
| 4MB (A) | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 4MB (B) | 2 & 3, 4 & 5 | 2 & 3, 4 & | 2 & 3, 4 | 2 & 3, 4 |
| | | 5 | & 5 | & 5 |
|----------+--------------+------------+----------+----------|
| 4MB (C) | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 8MB | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 10MB (A) | 1 & 2, 3 & 4 | 1 & 2, 3 & | 1 & 2, 3 | 1 & 2, 3 |
| | | 4 | & 4 | & 4 |
|----------+--------------+------------+----------+----------|
| 10MB (B) | 2 & 3, 4 & 5 | 2 & 3, 4 & | 2 & 3, 4 | 2 & 3, 4 |
| | | 5 | & 5 | & 5 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NPU SELECTION |
|------------------------------------------------------------|
| Setting | J11 | J12 |
|--------------------+--------------------+------------------|
| None | Pins 2 & 3 closed | Open |
|--------------------+--------------------+------------------|
| 80287 | Pins 2 & 3 closed | Open |
|--------------------+--------------------+------------------|
| 80387 | Pins 1 & 2 closed | Closed |
+------------------------------------------------------------+