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# NORTHGATE COMPUTER SYSTEMS, INC.
386/486/486SX (386 BOARD)
Processor 80386DX
Processor Speed 25/33/40MHz
Chip Set OPTI
Max. Onboard DRAM 32MB
Cache 64KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit external memory card slot
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+------------+------------------+------------|
| External | J10 | Reset switch | J23 pins 9 |
| battery | | | & 19 |
|---------------+------------+------------------+------------|
| Speaker | J23 pins 1 | Power LED & | J23 pins |
| | - 4 | Keylock | 11 - 15 |
|---------------+------------+------------------+------------|
| Turbo switch | J23 pins 7 | 32-bit external | S1 |
| | & 17 | memory card | |
|---------------+------------+------------------+------------|
| Turbo LED | J23 pins 8 | | |
| | & 18 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP1 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP1 | Closed |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | JP2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP4 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP9 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP12 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | Dirty Bit |
|---------+--------------+--------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 4K x 4 | (1) 16K x 1 |
|------------------------------------------------------------|
| Note:The cache, TAG, and dirty bit chip locations and |
| sizes are unidentified. |
+------------------------------------------------------------+