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# NORTHGATE COMPUTER SYSTEMS, INC.
NORTHGATE ENERGY STAR LX400A/G REV. 3.1
Processor 80486SX/80487SX/80486DX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O Options 32-bit VESA local bus slots (2), PS/2 mouse port,
green PC connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo LED | J3 | Flash LED | J10 |
|---------------+----------+----------------------+----------|
| Turbo switch | J4 | PS/2 mouse port | J11 |
|---------------+----------+----------------------+----------|
| Speaker | J5 | Green PC connector | J12 |
|---------------+----------+----------------------+----------|
| Reset switch | J6 | Green PC connector | J28 |
| | | (monitor) | |
|---------------+----------+----------------------+----------|
| Power LED & | J7 | 32-bit VESA local | SL1 & |
| keylock | | bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP2 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP2 | Open |
|---+----------------------------------+--------+------------|
| » | On board mouse enabled | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board mouse disabled | JP12 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP13 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP14 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP14 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP21 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP100 | Open |
| | 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | SR1 | SR2 | SR3 | SR4 | SR5 |
|----------+----------+----------+---------+--------+--------|
| 64KB | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP6 | JP7 | JP8 |
|-----------+--------+-------------------+-------------------|
| 80486SX | Open | Open | pins 2 & 3 closed |
|-----------+--------+-------------------+-------------------|
| 80487SX | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
|-----------+--------+-------------------+-------------------|
| 80486DX2 | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP10 | JP11 |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 50iMHz | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 66iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP24 | JP26 |
|------------------+--------------------+--------------------|
| 0 wait states | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1 wait state | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP25 | JP27 |
|------------------+--------------------+--------------------|
| <= 33MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| > 33MHz | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+