
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 DRAM256MB
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

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Reset switch                J6        Turbo switch              J22

  Speaker                     J8        Turbo LED                 J24

  Power LED & keylock         J9        32-bit VESA local      SL1 - SL3
                                        bus slots

                        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 36        NONE
                     36

      8MB       (1) 1M x 36    (1) 1M x 36        NONE           NONE

      8MB       (1) 2M x 36        NONE           NONE           NONE

     10MB        (1) 256K x     (1) 256K x    (1) 1M x 36    (1) 1M x 36
                     36             36

     10MB        (1) 512K x        NONE       (1) 1M x 36    (1) 1M x 36
                     36

     12MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     16MB       (1) 2M x 36        NONE       (1) 2M x 36        NONE

     16MB       (1) 4M x 36        NONE           NONE           NONE

     18MB        (1) 256K x     (1) 256K x    (1) 4M x 36        NONE
                     36             36

     18MB        (1) 512K x        NONE       (1) 4M x 36        NONE
                     36

     20MB       (1) 1M x 36    (1) 4M x 36        NONE           NONE

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        NONE

     32MB       (1) 4M x 36    (1) 4M x 36        NONE           NONE

     34MB        (1) 512K x        NONE       (1) 4M x 36    (1) 4M x 36
                     36

     36MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36        NONE

     40MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     48MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36        NONE

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 16M x 36       NONE           NONE           NONE

     128MB      (1) 16M x 36   (1) 16M x 36       NONE           NONE

     172MB      (1) 16M x 36   (1) 16M x 36   (1) 16M x 36       NONE

     256MB      (1) 16M x 36   (1) 16M x 36   (1) 16M x 36   (1) 16M x 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 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3

  128KB    2 & 3   2 & 3   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3   1 & 2

  256KB    2 & 3   2 & 3   2 & 3   1 & 2   1 & 2   2 & 3   2 & 3   4 & 5

  512KB    2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   1 & 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

