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

   SLIMLINE CACHE 25/33

   Processor        80386DX                                       
   Processor Speed  25/33MHz                                      
   Chip Set         OPTI                                          
   Max. Onboard     16MB                                          
   DRAM             
   Cache            64/256KB                                      
   BIOS             AMI                                           
   Dimensions       350mm x 304mm                                 
   I/O Options      Floppy drive interface, IDE interface,        
                    parallel port, serial ports (2), VGA port     
   NPU Options      80387/3167                                    

<gopher://bitreich.org/I/th99/m/M-O/30634-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | VGA port          |    J1    | Serial port 2    |   J10    |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |    J3    | Parallel port    |   J15    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    J4    | Floppy drive     |   J16    |
   | keylock           |          | interface        |          |
   |-------------------+----------+------------------+----------|
   | Speaker           |    J5    | IDE interface    |   J17    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    J6    | Riser card       |    R1    |
   |-------------------+----------+------------------+----------|
   | IDE interface LED |    J8    | Turbo switch     |    W6    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |    J9    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function             |   Jumper   |  Position  |
   |----------------------------------+------------+------------|
   |>> | Floppy drive interface       |  SW2/pins  |   Closed   |
   |   | interrupt (IRQ6) enabled     |  11 & 12   |            |
   |---+------------------------------+------------+------------|
   |   | Floppy drive interface       |  SW2/pins  |    Open    |
   |   | interrupt (IRQ6) disabled    |  11 & 12   |            |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive interface       |  SW2/pins  |   Closed   |
   |   | DMARQ2 enabled               |  13 & 14   |            |
   |---+------------------------------+------------+------------|
   |   | Floppy drive interface       |  SW2/pins  |    Open    |
   |   | DMARQ2 disabled              |  13 & 14   |            |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive interface DACK2 |  SW2/pins  |   Closed   |
   |   | enabled                      |  15 & 16   |            |
   |---+------------------------------+------------+------------|
   |   | Floppy drive interface DACK2 |  SW2/pins  |    Open    |
   |   | disabled                     |  15 & 16   |            |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive interface       | SW3/pins 1 |   Closed   |
   |   | enabled                      |    & 2     |            |
   |---+------------------------------+------------+------------|
   |   | Floppy drive interface       | SW3/pins 1 |    Open    |
   |   | disabled                     |    & 2     |            |
   |---+------------------------------+------------+------------|
   |>> | Factory configured - do not  |     W1     |    Open    |
   |   | alter                        |            |            |
   |---+------------------------------+------------+------------|
   |>> | Cache enabled                |     W4     |   Closed   |
   |---+------------------------------+------------+------------|
   |   | Cache disabled               |     W4     |    Open    |
   |---+------------------------------+------------+------------|
   |>> | BIOS type select 27512       |     W5     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | BIOS type select 27256       |     W5     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Monitor type select          |     W7     | pins 1 & 2 |
   |   | monochrome                   |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Monitor type select color    |     W7     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Parallel port mode select    |    W13     | pins 2 & 3 |
   |   | input only                   |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Parallel port mode select    |    W13     | pins 1 & 2 |
   |   | bi-directional               |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive precompensation |    W17     | pins 2 & 3 |
   |   | select standard              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Floppy drive precompensation |    W17     | pins 1 & 2 |
   |   | select alternate             |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive mode select     |    W18     | pins 1 & 2 |
   |   | single speed                 |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Floppy drive mode select     |    W18     | pins 2 & 3 |
   |   | dual speed                   |            |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |     DRAM CONFIGURATION (PAL CHIP "A" INSTALLED AT U44)     |
   |------------------------------------------------------------|
   |       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        |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   | DRAM JUMPER CONFIGURATION (PAL CHIP "A" INSTALLED AT U44)  |
   |------------------------------------------------------------|
   | Size |  W8   |  W9   |  W10  |  W11  |         SW1         |
   |------+-------+-------+-------+-------+---------------------|
   | 1MB  | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |  1 & 2, 5 & 6, 7 &  |
   |      |       |       |       |       |      8, 9 & 10      |
   |------+-------+-------+-------+-------+---------------------|
   | 2MB  | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2, 5 & 6, 7 & 8 |
   |------+-------+-------+-------+-------+---------------------|
   | 4MB  | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |    7 & 8, 9 & 10    |
   |------+-------+-------+-------+-------+---------------------|
   | 8MB  | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |        7 & 8        |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |     DRAM CONFIGURATION (PAL CHIP "B" INSTALLED AT U44)     |
   |------------------------------------------------------------|
   |       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        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   | DRAM JUMPER CONFIGURATION (PAL CHIP "B" INSTALLED AT U44)  |
   |------------------------------------------------------------|
   | Size  |   W8   |  W9   |  W10  |  W11  |        SW1        |
   |-------+--------+-------+-------+-------+-------------------|
   |  4MB  | 1 & 2  | 2 & 3 | 1 & 2 | 2 & 3 |   7 & 8, 9 & 10   |
   |-------+--------+-------+-------+-------+-------------------|
   |  8MB  | 1 & 2  | 2 & 3 | 1 & 2 | 2 & 3 |       7 & 8       |
   |-------+--------+-------+-------+-------+-------------------|
   | 16MB  | 1 & 2  | 1 & 2 | 1 & 2 | 1 & 2 | 5 & 6, 7 & 8, 9 & |
   |       |        |       |       |       |        10         |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |            Size            |            Bank 0             |
   |----------------------------+-------------------------------|
   |            64KB            |          (10) 8K x 8          |
   |----------------------------+-------------------------------|
   |           256KB            |         (10) 32K x 8          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |          W2           |          W3           |
   |------------+-----------------------+-----------------------|
   |    64KB    |   pins 1 & 2 closed   |   pins 1 & 2 closed   |
   |------------+-----------------------+-----------------------|
   |   256KB    |   pins 2 & 3 closed   |   pins 2 & 3 closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     IDE CONFIGURATION                      |
   |------------------------------------------------------------|
   |      Setting       |        W20        |        W21        |
   |--------------------+-------------------+-------------------|
   |      Enabled       |       Open        |      Closed       |
   |--------------------+-------------------+-------------------|
   |      Disabled      |      Closed       |       Open        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            PARALLEL PORT ADDRESS CONFIGURATION             |
   |------------------------------------------------------------|
   |          Address           |              SW3              |
   |----------------------------+-------------------------------|
   |            378h            |             Open              |
   |----------------------------+-------------------------------|
   |            3BCh            |      pins 11 & 12 closed      |
   |----------------------------+-------------------------------|
   |            278h            |      pins 9 & 10 closed       |
   |----------------------------+-------------------------------|
   |          Disabled          |  pins 9 & 10, 11 & 12 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              PARALLEL PORT IRQ CONFIGURATION               |
   |------------------------------------------------------------|
   |            IRQ             |              SW2              |
   |----------------------------+-------------------------------|
   |            IRQ7            |      pins 9 & 10 closed       |
   |----------------------------+-------------------------------|
   |            IRQ5            |       pins 7 & 8 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                SERIAL PORT 1 CONFIGURATION                 |
   |------------------------------------------------------------|
   |     Setting      |        SW2         |        SW3         |
   |------------------+--------------------+--------------------|
   |     Enabled      | pins 5 & 6 closed  |        Open        |
   |------------------+--------------------+--------------------|
   |     Disabled     |        Open        | pins 7 & 8 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                SERIAL PORT 2 CONFIGURATION                 |
   |------------------------------------------------------------|
   |     Setting      |        SW2         |        SW3         |
   |------------------+--------------------+--------------------|
   |     Enabled      | pins 3 & 4 closed  |        Open        |
   |------------------+--------------------+--------------------|
   |     Disabled     |        Open        | pins 3 & 4 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    VIDEO CONFIGURATION                     |
   |------------------------------------------------------------|
   |         Setting          |               SW5               |
   |--------------------------+---------------------------------|
   |         Enabled          | pins 1 & 2, 3 & 4, 5 & 6 closed |
   |--------------------------+---------------------------------|
   |         Disabled         |        pins 7 & 8 closed        |
   +------------------------------------------------------------+