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# NORTHGATE COMPUTER SYSTEMS, INC.
486E
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50/50(internal)/66(internal)MHz
Chip Set OPTI
Max. Onboard DRAM 128MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+---------------+-------------+--------------|
| IDE interface | J4 & J5 pins | Turbo LED | J5 pins 8 & |
| LED | 10 & 20 | | 18 |
|---------------+---------------+-------------+--------------|
| Speaker | J5 pins 1 - 4 | Reset | J5 pins 9 & |
| | | switch | 19 |
|---------------+---------------+-------------+--------------|
| Turbo switch | J5 pins 7 & | Power LED & | J5 pins 11 - |
| | 17 | keylock | 15 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Monitor type select color | JP5 | Closed |
|---+------------------------------------+--------+----------|
| | Monitor type select monochrome | JP5 | Open |
|---+------------------------------------+--------+----------|
| » | EISA EXRDY to CHRDY conversion | JP7 | Open |
| | disabled | | |
|---+------------------------------------+--------+----------|
| | EISA EXRDY to CHRDY conversion | JP7 | Closed |
| | enabled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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:When upgrading to 128MB, you must increase the cache |
| to 256KB. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG | TAG | TAG |
| | | | (U39) | (U41) | (U50) |
|-------+-----------+---------+----------+---------+---------|
| 64KB | (4) 8K x | (4) 8K | (1) 8K x | (1) 16K | (1) 16K |
| | 8 | x 8 | 8 | x 1 | x 1 |
|-------+-----------+---------+----------+---------+---------|
| 128KB | (4) 32K x | NONE | (1) 8K x | (1) 16K | (1) 16K |
| | 8 | | 8 | x 1 | x 1 |
|-------+-----------+---------+----------+---------+---------|
| 256KB | (4) 32K x | (4) 32K | (1) 32K | (1) 16K | (1) 16K |
| | 8 | x 8 | x 8 | x 1 | x 1 |
+------------------------------------------------------------+
+-----------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|-----------------------------------------------------------------|
|Size | RNA1 | RNA2 | RNB1 | RNB2 | RNC1 | RNC2 |
|-----+---------+---------+---------+---------+---------+---------|
|64KB |Installed|Installed| Not | Not | Not | Not |
| | | |installed|installed|installed|installed|
|-----+---------+---------+---------+---------+---------+---------|
|128KB| Not | Not |Installed|Installed| Not | Not |
| |installed|installed| | |installed|installed|
|-----+---------+---------+---------+---------+---------+---------|
|256KB| Not | Not | Not | Not |Installed|Installed|
| |installed|installed|installed|installed| | |
+-----------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | RBA | RBB | RBC | W4 |
|----------+--------------+------------+------------+--------|
| 80486SX | Installed | Not | Not | Closed |
| | | installed | installed | |
|----------+--------------+------------+------------+--------|
| 80487SX | Not | Installed | Not | Open |
| | installed | | installed | |
|----------+--------------+------------+------------+--------|
| 80486DX | Not | Not | Installed | Open |
| | installed | installed | | |
|----------+--------------+------------+------------+--------|
| 80486DX2 | Not | Not | Installed | Open |
| | installed | installed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP1 | JP2 | JP3 | JP4 |
|--------+------------+------------+------------+------------|
| 20MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 25MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 33MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50iMHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 66iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+