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                                         

<gopher://bitreich.org/I/th99/m/M-O/32364-1.png>
   

   +------------------------------------------------------------+
   |                        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  |
   |--------------------------------------+---------+-----------|
   |>> | 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  |
   +------------------------------------------------------------+