
NORTHGATE COMPUTER SYSTEMS, INC.

486ZXP

Processor        80486SX/80486DX/80486DX2
Processor Speed  16/20/25/33/50(internal)/66(internal)MHz
Chip Set         OPTI
Max. Onboard     32MB
DRAM
Cache            64/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      Parallel port, serial ports (2), floppy drive interface,
                 IDE interface
NPU Options      4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Parallel port               J1       Turbo LED                   JP3

  Serial port 1               J2       Reset switch                JP4

  Serial port 2               J3       Speaker                     JP5

  Floppy drive interface      J4       IDE interface LED           JP6

  IDE interface               J5       External battery           JP22

  Power LED & keylock         JP2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      Monitor type select color                JP1            Closed

      Monitor type select monochrome           JP1             Open

     Parallel port IRQ select                JP19           pins 2 & 3
      LPT1/IRQ7                                               closed

      Parallel port IRQ select                JP19           pins 1 & 2
      LPT2/IRQ5                                               closed

     I/O ports enabled                       JP20           pins 1 & 2
                                                              closed

      I/O ports disabled                      JP20           pins 2 & 3
                                                              closed

     Battery type select internal            JP21           pins 2 & 3
                                                              closed

      Battery type select external            JP21           pins 1 & 2
                                                              closed

                            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

  Note:Systems being used as file servers should not use the 5MB or 20MB
  configurations.

     CACHE CONFIGURATION

     Size          Bank 0

     64KB       (8) 64K x 1

     256KB      (8) 64K x 4

           CACHE JUMPER CONFIGURATION

   Size      JP7      JP11      JP12      JP13

   64KB     Open      Open      Open      Open

  256KB    Closed    Closed     Open     Closed

                          CPU TYPE CONFIGURATION

       Type                JP8               JP9               JP10

      80486SX             Open            pins 2 & 3           Open
                                            closed

      80486DX           pins 1 & 2        pins 1 & 2          Closed
                         closed             closed

     80486DX2           pins 2 & 3        pins 1 & 2          Closed
                         closed             closed

                          CPU SPEEDCONFIGURATION

    Speed         JP14            JP15           JP16           JP17

    16MHz       pins 2 & 3     pins 2 & 3     pins 2 & 3      pins 1 & 2
                 closed          closed         closed         closed

    20MHz       pins 2 & 3     pins 1 & 2     pins 2 & 3      pins 1 & 2
                 closed          closed         closed         closed

    25MHz       pins 2 & 3     pins 2 & 3     pins 1 & 2      pins 2 & 3
                 closed          closed         closed         closed

    33MHz       pins 2 & 3     pins 1 & 2     pins 1 & 2      pins 2 & 3
                 closed          closed         closed         closed

   50iMHz       pins 2 & 3     pins 2 & 3     pins 1 & 2      pins 2 & 3
                 closed          closed         closed         closed

   66iMHz       pins 2 & 3     pins 1 & 2     pins 1 & 2      pins 2 & 3
                 closed          closed         closed         closed

