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                                     

<gopher://bitreich.org/I/th99/m/M-O/30612-1.png>
   

   +------------------------------------------------------------+
   |                        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   |
   +------------------------------------------------------------+