
UNIDENTIFIED

80286 MOTHER BOARD

Processor         80286
Processor Speed   12/25MHz
Chip Set          Suntac
Max. Onboard DRAM 4MB
Cache             Award/Phoenix
BIOS              Unidentified
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                     J19       Turbo LED                  JP5

  Power LED & keylock         J20       Reset switch               JP6

  External battery            J21

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     Factory configured - do not          DSP1/2               N/A
      alter

     Factory configured - do not          DSP1/4               N/A
      alter

     Factory configured - do not            J18             pins 2 & 3
      alter                                                   closed

      BIOS type select Award                 JP7             pins 2 & 3
                                                              closed

      BIOS type select Phoenix               JP7             pins 1 & 2
                                                              closed

      Memory wait state select 0            JP11              Closed
      wait states

      Memory wait state select 1            JP11               Open
      wait state

      Monitor type select color              SW1             pins 2 & 3
                                                              closed

      Monitor type select                    SW1             pins 1 & 2
      monochrome                                              closed

  Note: The location of J18 is unidentified.

                            DRAM CONFIGURATION

   Mode       Size         Base         EMS        Bank 0       Bank 1
                         memory

    0        512KB        512KB         N/A      (18) 41256      NONE

    1        640KB        640KB         N/A      (18) 41256    (18) 4164

    2         1MB          1MB          N/A      (18) 41256    (18) 41256

    3         1MB         640KB        384KB     (18) 41256    (18) 41256

    4         2MB          2MB          N/A         (18)         NONE
                                                   411000

    5         2MB         640KB       1408KB        (18)         NONE
                                                   411000

    6         4MB          4MB          N/A         (18)          (18)
                                                   411000       411000

    7         4MB         640KB       3456KB        (18)          (18)
                                                   411000       411000

       DRAM SWITCH CONFIGURATION

   Mode    DSP1/6    DSP1/7    DSP1/8

    0        On        On        On

    1        On        On       Off

    2        On        Off       On

    3        On        Off      Off

    4        Off       On        On

    5        Off       On       Off

    6        Off       Off       On

    7        Off       Off      Off

             DRAM MODE CONFIGURATION

         Setting                   JP8

  Mode changes external           Closed

  Mode changes internal            Open

                         CLOCK SPEED CONFIGURATION

       Setting             DSP1/1             JP1               JP4

      High speed             Off           pins 2 & 3           N/A
      (internal)                             closed

       Low speed             On            pins 2 & 3           N/A
      (internal)                             closed

      High speed             N/A           pins 1 & 2          Closed
      (external)                             closed

       Low speed             N/A           pins 1 & 2           Open
      (external)                             closed

            Note: If JP4 is open, speed can be switched through the
            keyboard. High speed: CNTL, ALT, 2. Low speed: CNTL, ALT, 1.
            (Award BIOS only)

                 I/O WAIT STATE CONFIGURATION

     Wait states             JP3                 DSP1/3

          4            pins 2 & 3 closed           On

          6            pins 2 & 3 closed          Off

          6            pins 1 & 2 closed          N/A

  Note: The location of JP3 is unidentified.

                      BIOS CONFIGURATION

        Type                 JP9                 DSP1/5

        27128          pins 1 & 2 closed           On

        27256          pins 2 & 3 closed          Off

  Note: The location of JP9 is unidentified.

