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# NORTHGATE COMPUTER SYSTEMS, INC.
ZXP EISA/VESA
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/50/66(internal)MHz
Chip Set SIS
Max. Onboard DRAM 256MB
Cache 64/128/256/512KB
BIOS AMI/Phoenix
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Reset switch | J6 | Turbo switch | J22 |
|---------------+----------+----------------------+----------|
| Speaker | J8 | Turbo LED | J24 |
|---------------+----------+----------------------+----------|
| Power LED & | J9 | 32-bit VESA local | SL1 - |
| keylock | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+---------+-----------|
| ยป | Monitor type select color | J7 | Closed |
|---+----------------------------------+---------+-----------|
| | Monitor type select monochrome | J7 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+--------------+------------+------------+-----------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|-------+--------------+------------+------------+-----------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|-------+--------------+------------+------------+-----------|
| 2MB | (1) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|-------+--------------+------------+------------+-----------|
| 4MB | (1) 256K x | (1) 256K x | (1) 512K x | NONE |
| | 36 | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 4MB | (1) 512K x | NONE | (1) 512K x | NONE |
| | 36 | | 36 | |
|-------+--------------+------------+------------+-----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|-------+--------------+------------+------------+-----------|
| 6MB | (1) 512K x | (1) 512K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 6MB | (1) 512K x | NONE | (1) 1M x | NONE |
| | 36 | | 36 | |
|-------+--------------+------------+------------+-----------|
| 8MB | (1) 1M x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|-------+--------------+------------+------------+-----------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|-------+--------------+------------+------------+-----------|
| 10MB | (1) 256K x | (1) 256K x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 10MB | (1) 512K x | NONE | (1) 1M x | (1) 1M x |
| | 36 | | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 12MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | NONE |
| | | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 16MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 16MB | (1) 2M x 36 | NONE | (1) 2M x | NONE |
| | | | 36 | |
|-------+--------------+------------+------------+-----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|-------+--------------+------------+------------+-----------|
| 18MB | (1) 256K x | (1) 256K x | (1) 4M x | NONE |
| | 36 | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 18MB | (1) 512K x | NONE | (1) 4M x | NONE |
| | 36 | | 36 | |
|-------+--------------+------------+------------+-----------|
| 20MB | (1) 1M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+--------------+------------+------------+-----------|
| 24MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+--------------+------------+------------+-----------|
| 34MB | (1) 512K x | NONE | (1) 4M x | (1) 4M x |
| | 36 | | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 36MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+--------------+------------+------------+-----------|
| 64MB | (1) 16M x 36 | NONE | NONE | NONE |
|-------+--------------+------------+------------+-----------|
| 128MB | (1) 16M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+--------------+------------+------------+-----------|
| 172MB | (1) 16M x 36 | (1) 16M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+--------------+------------+------------+-----------|
| 256MB | (1) 16M x 36 | (1) 16M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 64K x 1 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 64K x 1 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 64K x 1 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 64K x 1 |
|------------------------------------------------------------|
| Note: The location of the TAG socket is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JC1 | JC2 | JC3 | JC4 | JC5 | JC6 | JC7 | JC9 |
|-------+------+------+------+------+------+-----+-----+-----|
| 64KB | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 1 & | 2 & |
| | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 |
|-------+------+------+------+------+------+-----+-----+-----|
| 128KB | 2 & | 2 & | 1 & | 1 & | 1 & | 1 & | 2 & | 1 & |
| | 3 | 3 | 2 | 2 | 2 | 2 | 3 | 2 |
|-------+------+------+------+------+------+-----+-----+-----|
| 256KB | 2 & | 2 & | 2 & | 1 & | 1 & | 2 & | 2 & | 4 & |
| | 3 | 3 | 3 | 2 | 2 | 3 | 3 | 5 |
|-------+------+------+------+------+------+-----+-----+-----|
| 512KB | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 2 & | 1 & |
| | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J1 | J2 | J3 |
|-------------+--------+------------------+------------------|
| 80486SX | Closed | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
|-------------+--------+------------------+------------------|
| ODP486SX | Closed | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-------------+--------+------------------+------------------|
| 80487SX | Closed | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|-------------+--------+------------------+------------------|
| 80486DX/DX2 | Open | Open | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JL2 | JO1 | JO2 | JO3 | JO4 |
|----------+---------+---------+---------+---------+---------|
| 20MHz | Open | Open | Closed | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 25MHz | Open | Closed | Open | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 33MHz | Open | Closed | Closed | Open | Closed |
|----------+---------+---------+---------+---------+---------|
| 50iMHz | Open | Closed | Open | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 50MHz | Closed | Open | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 66iMHz | Open | Closed | Closed | Open | Closed |
+------------------------------------------------------------+