UNIDENTIFIED

286 MAIN BOARD (DIP VERSION)

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

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Power LED & keylock          J1       Turbo switch               J4

  Speaker                      J2       Turbo LED                  J5

  Reset switch                 J3

                        USER CONFIGURABLE SETTINGS

      Function                             Jumper           Position

      BIOS type select 27128                 JP1        pins 1 & 2 closed

      BIOS type select 27256                 JP1        pins 2 & 3 closed

  »   Monitor type select color              JP2             Closed

      Monitor type select monochrome         JP2              Open

  »   Factory configured - DRAM              JP5        pins 2 & 3 closed
      access speed 12MHz

      Invalid setting                        JP5        pins 1 & 2 closed

  »   NPU speed select ³ 8MHz               JP13        pins 1 & 2 closed

      NPU speed select £ 6MHz               JP13        pins 2 & 3 closed

  »   Bus speed select fast                 JP15             Closed

      Bus speed select slow                 JP15              Open

  »   Early address latch enabled           JP16              Open

      Early address latch disabled          JP16             Closed

  »   DRAM select 0 wait states             JP17             Closed

      DRAM select 1 wait state              JP17              Open

  »   Parity check enabled                  JP44              Open

      Parity check disabled                 JP44             Closed

      Notes: Location of pin 1s
      unverified. Location of JP44
      unverified

                                 DRAM CONFIGURATION

   Size     Bank 0   Bank 1   Bank 2     Bank   Bank 4     P0        P1       JP4
                                          3

  512KB      (16)     NONE     NONE     NONE     NONE      (2)      NONE     closed
            41256                                        41256

  512KB      NONE      (4)     NONE     NONE     NONE      (2)      NONE     closed
                     44256                               41256

  640KB      (16)      (4)     NONE     NONE     NONE      (2)       (2)     closed
            41256     4464                               41256      4164

  640KB      NONE      (4)     NONE      (4)     NONE      (2)       (2)     closed
                     44256              4464             41256      4164

  640KB      (16)     NONE      (16)    NONE     NONE      (2)       (2)     closed
            41256              4164                      41256      4164

  640KB      NONE      (4)      (16)    NONE     NONE      (2)       (2)     closed
                     44256     4164                      41256      4164

   1MB       (16)     NONE      (16)    NONE     NONE      (2)       (2)     closed
            41256              41256                     41256     41256

   1MB       NONE      (4)     NONE     NONE      (4)      (2)       (2)     closed
                     44256                      44256    41256     41256

   1MB       (16)     NONE     NONE     NONE      (4)      (2)       (2)     closed
            41256                               44256    41256     41256

   1MB       NONE      (4)      (16)    NONE     NONE      (2)       (2)     closed
                     44256     41256                     41256     41256

   2MB       (16)     NONE     NONE     NONE     NONE      (2)      NONE     open
            411000                                       411000

  2.128MB    (16)     NONE      (16)    NONE     NONE      (2)       (2)     open
            411000             4164                      411000     4164

  2.5MB      (16)     NONE      (16)    NONE     NONE      (2)       (2)     open
            411000             41256                     411000    41256

   4MB       (16)     NONE      (16)    NONE     NONE      (2)       (2)     open
            411000            411000                     411000    411000