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

   SUPERMICRO 286

   Processor    80286                                             
   Processor    12/16/20MHz                                       
   Speed        
   Chip Set     VLSI                                              
   Max. Onboard 4MB                                               
   DRAM         
   SRAM Cache   None                                              
   BIOS         Award                                             
   Dimensions   355mm x 304mm                                     
   I/O Options  16-bit onboard bus memory slot, parallel port,    
                serial port (2)                                   
   NPU Options  80287                                             

<gopher://bitreich.org/I/th99/m/M-O/31515-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    J1    | Parallel port    |   J201   |
   |-------------------+----------+------------------+----------|
   | Speaker           |    J2    | Serial port 2    |   J202   |
   |                   |          | (COM2)           |          |
   |-------------------+----------+------------------+----------|
   | External battery  |    J3    | Serial port 1    |   J203   |
   |                   |          | (COM1)           |          |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |    J5    | 16-bit onboard   |    S1    |
   |                   |          | bus memory slot  |          |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    J6    |                  |          |
   | keylock           |          |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | RAM select 0 wait states  |      W3       |     On     |
   |---+---------------------------+---------------+------------|
   |   | RAM select 1 wait state   |      W3       |    Off     |
   |---+---------------------------+---------------+------------|
   |>> | ROM select 0 wait states  |      W4       |     On     |
   |---+---------------------------+---------------+------------|
   |   | ROM select 1 wait state   |      W4       |    Off     |
   |---+---------------------------+---------------+------------|
   |>> | Monitor type select color |      W10      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Monitor type select       |      W10      | pins 1 & 2 |
   |   | monochrome                |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | CPU speed select high     |      W11      |    Open    |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select low      |      W11      | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select keyboard |      W11      | pins 1 & 2 |
   |   | control                   |               |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |  W6   |  W7   |
   |------------+---------------+---------------+-------+-------|
   |   512KB    |  (18) 41256   |     NONE      |  Off  |  On   |
   |------------+---------------+---------------+-------+-------|
   |    1MB     |  (18) 41256   |  (18) 41256   |  Off  |  Off  |
   |------------+---------------+---------------+-------+-------|
   |    2MB     |  (18) 411000  |     NONE      |  On   |  On   |
   |------------+---------------+---------------+-------+-------|
   |    4MB     |  (18) 411000  |  (18) 411000  |  On   |  Off  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 MEMORY SPEED CONFIGURATION                 |
   |------------------------------------------------------------|
   |        Speed        |                  W5                  |
   |---------------------+--------------------------------------|
   |        60ns         |          pins 1 & 2 closed           |
   |---------------------+--------------------------------------|
   |        80ns         |       pins 1 & 2, 3 & 4 closed       |
   |---------------------+--------------------------------------|
   |        100ns        |          pins 2 & 3 closed           |
   |------------------------------------------------------------|
   | Note:Speed is factory configured and should not be         |
   | altered.                                                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  NPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |  Speed   |   OSC    |        W1         |        W2        |
   |----------+----------+-------------------+------------------|
   | 7.15MHz  | 7.15MHz  | pins 1 & 2 closed |    pins 3 & 4    |
   |          |          |                   |      closed      |
   |----------+----------+-------------------+------------------|
   | 7.15MHz  | 21.45MHz | pins 2 & 3 closed |    pins 3 & 4    |
   |          |          |                   |      closed      |
   |----------+----------+-------------------+------------------|
   | 10.00MHz | 10.00MHz | pins 1 & 2 closed |    Pins 5 & 6    |
   |          |          |                   |      closed      |
   |----------+----------+-------------------+------------------|
   | 10.00MHz | 30.00MHz | pins 2 & 3 closed |    Pins 5 & 6    |
   |          |          |                   |      closed      |
   |----------+----------+-------------------+------------------|
   | 14.32MHz | 14.32MHz | pins 1 & 2 closed |    pins 1 & 2    |
   |          |          |                   |      closed      |
   |----------+----------+-------------------+------------------|
   | 14.32MHz | 42.96MHz | pins 2 & 3 closed |    pins 1 & 2    |
   |          |          |                   |      closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SERIAL PORT CONFIGURATION                  |
   |------------------------------------------------------------|
   |Port 1 (J203)|Port 2 (J202)|SW201/1 |SW201/2|SW202/1|SW202/2|
   |-------------+-------------+--------+-------+-------+-------|
   |  COM1/IRQ4  |  COM2/IRQ3  |  Off   |  Off  |  On   |  On   |
   |-------------+-------------+--------+-------+-------+-------|
   |  COM1/IRQ4  |  Disabled   |  Off   |  On   |  On   |  Off  |
   |-------------+-------------+--------+-------+-------+-------|
   |  Disabled   |  COM2/IRQ3  |  Off   |  On   |  Off  |  On   |
   |-------------+-------------+--------+-------+-------+-------|
   |  Disabled   |  Disabled   |   On   |  On   |  N/A  |  N/A  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |    LPT     |  IRQ  | SW201/3 | SW201/4 | SW202/3 | SW202/4 |
   |------------+-------+---------+---------+---------+---------|
   |    LPT1    | IRQ5  |   Off   |   Off   |   On    |   Off   |
   |------------+-------+---------+---------+---------+---------|
   |    LPT1    | IRQ7  |   Off   |   Off   |   Off   |   On    |
   |------------+-------+---------+---------+---------+---------|
   |    LPT2    | IRQ5  |   Off   |   On    |   On    |   Off   |
   |------------+-------+---------+---------+---------+---------|
   |    LPT2    | IRQ7  |   Off   |   On    |   Off   |   On    |
   |------------+-------+---------+---------+---------+---------|
   |  Disabled  |  N/A  |   On    |   N/A   |   N/A   |   N/A   |
   +------------------------------------------------------------+