
NORTHGATE COMPUTER SYSTEMS, INC.

SLIMLINE CACHE 25/33

Processor               80386DX
Processor Speed         25/33MHz
Chip Set                OPTI
Max. Onboard DRAM       16MB
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

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  VGA port                    J1       Serial port 2               J10

  Turbo LED                   J3       Parallel port               J15

  Power LED & keylock         J4       Floppy drive interface      J16

  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 interrupt    SW2/pins 11 &        Closed
      (IRQ6) enabled                           12

      Floppy drive interface interrupt    SW2/pins 11 &         Open
      (IRQ6) disabled                          12

     Floppy drive interface DMARQ2       SW2/pins 13 &        Closed
      enabled                                  14

      Floppy drive interface DMARQ2       SW2/pins 13 &         Open
      disabled                                 14

     Floppy drive interface DACK2        SW2/pins 15 &        Closed
      enabled                                  16

      Floppy drive interface DACK2        SW2/pins 15 &         Open
      disabled                                 16

     Floppy drive interface enabled       SW3/pins 1 &        Closed
                                                2

      Floppy drive interface disabled      SW3/pins 1 &         Open
                                                2

     Factory configured - do not alter        W1               Open

     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 monochrome           W7            pins 1 & 2
                                                               closed

      Monitor type select color                W7            pins 2 & 3
                                                               closed

     Parallel port mode select input          W13           pins 2 & 3
      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 single          W18           pins 1 & 2
      speed                                                    closed

      Floppy drive mode select dual            W18           pins 2 & 3
      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

