NORTHGATE COMPUTER SYSTEMS, INC.
================================

   386/486/486SX (486 BOARD)

   Processor             80486SX/80486DX                          
   Processor Speed       20/33MHz                                 
   Chip Set              OPTI                                     
   Max. Onboard DRAM     32MB                                     
   Cache                 64KB                                     
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           32-bit external memory card slot         
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/M-O/30666-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       |  Location  | Purpose          |  Location  |
   |---------------+------------+------------------+------------|
   | External      |    J10     | Reset switch     | J23 pins 9 |
   | battery       |            |                  |    & 19    |
   |---------------+------------+------------------+------------|
   | Speaker       | J23 pins 1 | Power LED &      |  J23 pins  |
   |               |    - 4     | Keylock          |  11 - 15   |
   |---------------+------------+------------------+------------|
   | Turbo switch  | J23 pins 7 | 32-bit external  |     S1     |
   |               |    & 17    | memory card      |            |
   |---------------+------------+------------------+------------|
   | Turbo LED     | J23 pins 8 |                  |            |
   |               |    & 18    |                  |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select monochrome   |  JP1   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select color        |  JP1   |   Closed   |
   |---+----------------------------------+--------+------------|
   |>> | Battery type select internal     |  JP2   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Battery type select external     |  JP2   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP3   |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP4   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP9   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP12  |    N/A     |
   |   | alter                            |        |            |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size   |    Bank 0    |     TAG      |     Dirty Bit      |
   |---------+--------------+--------------+--------------------|
   |  64KB   |  (8) 8K x 8  |  (1) 8K x 8  |    (1) 16K x 1     |
   |------------------------------------------------------------|
   | Note:The cache, TAG, and dirty bit chip locations and      |
   | sizes are unidentified.                                    |
   +------------------------------------------------------------+