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# UNIDENTIFIED
80386SX MOTHERBOARD
Processor 80386SX
Processor Speed 16MHz
Chip Set NEAT
Max. Onboard DRAM 8MB
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Reset switch | J4 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | Turbo LED | J5 |
|-------------------+----------+------------------+----------|
| Turbo switch | J3 | External battery | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Turbo enabled | J3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Turbo disabled | J3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | J6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | J6 | Closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J6 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Pipeline enabled | JP3 | Closed |
|---+----------------------------------+--------+------------|
| | Pipeline disabled | JP3 | Open |
|---+----------------------------------+--------+------------|
| » | NPU asynchronous with CPU | JP4 | Closed |
|---+----------------------------------+--------+------------|
| | NPU synchronous with CPU | JP4 | Open |
|---+----------------------------------+--------+------------|
| | NPU enabled | JP5 | Closed |
|---+----------------------------------+--------+------------|
| | NPU disabled | JP5 | Open |
|---+----------------------------------+--------+------------|
| » | Clock select 80386SX clock 2 | JP6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Clock select 80387SX clock 2 | JP6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | BIOS type select 27256 | JP7 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | BIOS type select 27128 | JP7 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | JP8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select | JP8 | pins 1 & 2 |
| | color/EGA/VGA | | closed |
|---+----------------------------------+--------+------------|
| » | BIOS pin select 23 pin | JP9 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | BIOS pin select 30 pin | JP9 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 512KB | (2) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 512KB | NONE | NONE | (18) 41256 | NONE |
|-------+-------------+------------+------------+------------|
| 1MB | (2) 256K x | (2) 256K x | NONE | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 1MB | NONE | NONE | (18) 41256 | (18) 41256 |
|-------+-------------+------------+------------+------------|
| 1.5MB | (2) 256K x | (2) 256K x | (18) 41256 | NONE |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 1.5MB | (2) 256K x | NONE | (18) 41256 | (18) 41256 |
| | 9 | | | |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 256K x | (2) 256K x | (18) 41256 | (18) 41256 |
| | 9 | 9 | | |
|-------+-------------+------------+------------+------------|
| 2MB | (2) 1M x 9 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 2MB | NONE | NONE | (18) | (18) |
| | | | 411000 | 411000 |
|-------+-------------+------------+------------+------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 4MB | (2) 1M x 9 | NONE | (18) | (18) |
| | | | 411000 | 411000 |
|-------+-------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (18) 41256 | (18) 41256 |
|-------+-------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (18) | NONE |
| | | | 411000 | |
|-------+-------------+------------+------------+------------|
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (18) 41256 | (18) 41256 |
|-------+-------------+------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (18) | (18) |
| | | | 411000 | 411000 |
|-------+-------------+------------+------------+------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (18) | (18) |
| | | | 411000 | 411000 |
|-------+-------------+------------+------------+------------|
| 8MB | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 |
|-------+--------------------------+-------------------------|
| 512KB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 512KB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 1MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 1MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 1.5MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 1.5MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 2MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 2MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 2MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 4MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 4MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 5MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 5MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 5MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 6MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|-------+--------------------------+-------------------------|
| 6MB | 1 & 12, 2 & 11, 3 & 10, | 1 & 12, 2 & 11, 3 & 10, |
| | 4 & 9, 5 & 8, 6 & 7 | 4 & 9, 5 & 8, 6 & 7 |
|-------+--------------------------+-------------------------|
| 8MB | 1 & 2, 3 & 4, 5 & 6, 7 & | 1 & 2, 3 & 4, 5 & 6, 7 |
| | 8, 9 & 10, 11 & 12 | & 8, 9 & 10, 11 & 12 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+