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# NORTHGATE COMPUTER SYSTEMS, INC.
ZXP EISA
Processor 80486DX/80486DX2
Processor 33/50(internal)/50/66(internal)MHz
Speed
Chip Set OPTI
Max. Onboard 128MB
DRAM
Cache 64/128/256/512KB
BIOS AMI/Phoenix
Dimensions 330mm x 218mm
I/O Options External memory card, floppy drive interface, IDE
interface, parallel port, serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Reset switch | P2 | Serial port 2 | P8 |
|-------------------+----------+------------------+----------|
| Speaker | P3 | Parallel port | P9 |
|-------------------+----------+------------------+----------|
| Power LED & | P4 | IDE interface | P10 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Turbo LED | P5 | Floppy drive | P11 |
| | | interface | |
|-------------------+----------+------------------+----------|
| IDE interface LED | P6 | External memory | P15 |
| | | card | |
|-------------------+----------+------------------+----------|
| Serial port 1 | P7 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | J11 | Open |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | J12 | Open |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | J20 | Open |
|---+-----------------------------------+---------+----------|
| » | Factory configured - do not alter | J21 | Open |
|---+-----------------------------------+---------+----------|
| » | Monitor type select color | P1 | Closed |
|---+-----------------------------------+---------+----------|
| | Monitor type select monochrome | P1 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------+------------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|--------------+------------------------+--------------------|
| 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 |
|--------------+------------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|--------------+------------------------+--------------------|
| 128MB | (4) 16M x 9 | (4) 16M x 9 |
|------------------------------------------------------------|
| Note: An external memory card is available, but actual |
| sizes are not identified by the manufacturer. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
|Size | J1 | J2 | J3 | J4 | J5 | J6 | J8 |
|-----+------+------+------+------+------+------+------------|
|64KB | Open | Open | Open | Open | Open | Open | pins 2 & 3 |
| | | | | | | | closed |
|-----+------+------+------+------+------+------+------------|
|128KB| Open | Open |Closed| Open |Closed| Open | pins 1 & 2 |
| | | | | | | | closed |
|-----+------+------+------+------+------+------+------------|
|256KB| Open |Closed|Closed|Closed|Closed| Open | pins 2 & 3 |
| | | | | | | | closed |
|-----+------+------+------+------+------+------+------------|
|512KB|Closed|Closed|Closed|Closed|Closed|Closed| pins 1 & 2 |
| | | | | | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J9 | J10 |
|-------------+-------------------+--------------------------|
| 80486DX/DX2 | pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
|Speed | J7 | J13 | J14 | J15 | J16 | J17 | J18 | J19 |
|------+-----+------+------+-----+------+------+------+------|
|33MHz |Open | Open |Closed|Open |Closed| Open |1 & 2 |2 & 3 |
|------+-----+------+------+-----+------+------+------+------|
|50iMHz|Open |Closed|Closed|Open | Open | Open |1 & 2 |2 & 3 |
|------+-----+------+------+-----+------+------+------+------|
|50MHz |Open | Open | Open |Open |Closed|Closed|2 & 3 |2 & 3 |
|------+-----+------+------+-----+------+------+------+------|
|66iMHz|Open | Open |Closed|Open |Closed| Open |1 & 2 |2 & 3 |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+