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# UNIDENTIFIED
J-286P SYSTEM BOARD
Processor 80286 (exact location unknown)
Processor 12/16/20/24MHz
Speed
Chip Set Suntac
Max. Onboard 5MB
DRAM
Cache None
BIOS AMI
Dimensions 220mm x 220mm
I/O Options Floppy drive interface (on some models), IDE
interface (on some models)
NPU Options 80287 (exact location unknown)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Reset switch | J1 | Speaker | J4 |
|----------------+----------+---------------------+----------|
| Turbo switch | J2 | Power LED & keylock | J5 |
|----------------+----------+---------------------+----------|
| Turbo LED | J3 | External battery | JP9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP1 | Open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP2 | Open |
|---+------------------------------------+--------+----------|
| » | Floppy drive interface enabled | JP5 | Closed |
| | (interface location unknown) | | |
|---+------------------------------------+--------+----------|
| | Floppy drive interface disabled | JP5 | Open |
|---+------------------------------------+--------+----------|
| » | Monitor type select monochrome | JP12 | Open |
|---+------------------------------------+--------+----------|
| | Monitor type select color | JP12 | Closed |
|---+------------------------------------+--------+----------|
| » | Parity check enabled | JP13 | Closed |
|---+------------------------------------+--------+----------|
| | Parity check disabled | JP13 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Parity | Bank 3 | Parity |
| | | | | 2 | | 3 |
|------+--------+--------+--------+--------+--------+--------|
| 1MB | NONE | NONE | (4) | (4) | (4) | (4) |
| | | | 44256 | 41256 | 44256 | 41256 |
|------+--------+--------+--------+--------+--------+--------|
| 1MB | (2) | (2) | NONE | NONE | NONE | NONE |
| | 256K x | 256K x | | | | |
| | 9 | 9 | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 2MB | (2) | (2) | (4) | (4) | (4) | (4) |
| | 256K x | 256K x | 44256 | 41256 | 44256 | 41256 |
| | 9 | 9 | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 2MB | (2) 1M | NONE | NONE | NONE | NONE | NONE |
| | x 9 | | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 3MB | (2) 1M | NONE | (4) | (4) | (4) | (4) |
| | x 9 | | 44256 | 41256 | 44256 | 41256 |
|------+--------+--------+--------+--------+--------+--------|
| 4MB | (2) 1M | (2) 1M | NONE | NONE | NONE | NONE |
| | x 9 | x 9 | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 5MB | (2) 1M | (2) 1M | (4) | (4) | (4) | (4) |
| | x 9 | x 9 | 44256 | 41256 | 44256 | 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 |
|------+--------------+------------+------------+------------|
| 1MB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 1MB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 2MB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 2MB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 3MB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 4MB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|------+--------------+------------+------------+------------|
| 5MB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| IDE INTERFACE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP3 | JP4 |
|----------------------+------------------+------------------|
| Enabled | Closed | Open |
|----------------------+------------------+------------------|
| Disabled | Open | Closed |
|------------------------------------------------------------|
| Note: The location of the interface is unknown. Interface |
| is an option and may not be present. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| System speed | Bus speed | JP20 |
|--------------------+------------------+--------------------|
| 12MHz | 6MHz | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 16MHz | 8MHz | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 20MHz | 8MHz | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| 24MHz | 8MHz | pins 2 & 3 closed |
+------------------------------------------------------------+