NORTHGATE COMPUTER SYSTEMS, INC.

SUPERMICRO 286

Processor           80286
Processor Speed     12/16/20MHz
Chip Set            VLSI
Max. Onboard DRAM   4MB
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

[Image]

                                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 bus         S1
                                       memory slot

  Power LED & keylock        J6

                        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        pins 3 & 4
                                           closed             closed

      7.15MHz           21.45MHz          pins 2 & 3        pins 3 & 4
                                           closed             closed

     10.00MHz           10.00MHz          pins 1 & 2        Pins 5 & 6
                                           closed             closed

     10.00MHz           30.00MHz          pins 2 & 3        Pins 5 & 6
                                           closed             closed

     14.32MHz           14.32MHz          pins 1 & 2        pins 1 & 2
                                           closed             closed

     14.32MHz           42.96MHz          pins 2 & 3        pins 1 & 2
                                           closed             closed

                         SERIAL PORT CONFIGURATION

     Port 1         Port 2      SW201/1    SW201/2    SW202/1    SW202/2
    (J203)          (J202)

   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