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# NORTHGATE COMPUTER SYSTEMS, INC.
486ZXP
Processor 80486SX/80486DX/80486DX2
Processor Speed 16/20/25/33/50(internal)/66(internal)MHz
Chip Set OPTI
Max. Onboard 32MB
DRAM
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Parallel port, serial ports (2), floppy drive
interface, IDE interface
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Parallel port | J1 | Turbo LED | JP3 |
|-------------------+----------+------------------+----------|
| Serial port 1 | J2 | Reset switch | JP4 |
|-------------------+----------+------------------+----------|
| Serial port 2 | J3 | Speaker | JP5 |
|-------------------+----------+------------------+----------|
| Floppy drive | J4 | IDE interface | JP6 |
| interface | | LED | |
|-------------------+----------+------------------+----------|
| IDE interface | J5 | External battery | JP22 |
|-------------------+----------+------------------+----------|
| Power LED & | JP2 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | Monitor type select color | JP1 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP1 | Open |
|---+----------------------------------+--------+------------|
| » | Parallel port IRQ select | JP19 | pins 2 & 3 |
| | LPT1/IRQ7 | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port IRQ select | JP19 | pins 1 & 2 |
| | LPT2/IRQ5 | | closed |
|---+----------------------------------+--------+------------|
| » | I/O ports enabled | JP20 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | I/O ports disabled | JP20 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | JP21 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP21 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------------------------------------------------|
| Note:Systems being used as file servers should not use the |
| 5MB or 20MB configurations. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 64KB | (8) 64K x 1 |
|----------------------------+-------------------------------|
| 256KB | (8) 64K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP7 | JP11 | JP12 | JP13 |
|-----------+------------+------------+----------+-----------|
| 64KB | Open | Open | Open | Open |
|-----------+------------+------------+----------+-----------|
| 256KB | Closed | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 | JP9 | JP10 |
|-----------+-------------------+-------------------+--------|
| 80486SX | Open | pins 2 & 3 closed | Open |
|-----------+-------------------+-------------------+--------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
|-----------+-------------------+-------------------+--------|
| 80486DX2 | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEEDCONFIGURATION |
|------------------------------------------------------------|
| Speed | JP14 | JP15 | JP16 | JP17 |
|--------+------------+------------+------------+------------|
| 16MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 20MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 25MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 33MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50iMHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 66iMHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+