
UNIDENTIFIED

386SX25/20/16

Processor         80386SX
Processor Speed   16/20/25MHz
Chip Set          OPTI
Max. Onboard DRAM 16MB
Cache             None
BIOS              AMI
Dimensions        223mm x 218mm
I/O Options       None
NPU Options       80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            JP2       Reset switch              JP10

  Speaker                     JP8       Turbo switch              JP11

  Power LED & keylock         JP9       Turbo LED                 JP12

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome           JP1             Open

      Monitor type select color                JP1            Closed

     CMOS memory normal operation             JP3           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP3           pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

  Size    Bank 0   Bank 1     Bank 2      Parity     Bank 3       Parity
                                          (P-2)                   (P-3)

  1MB       (2)      (2)       NONE        NONE       NONE        NONE
          256K x    256K x
            9         9

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

  2MB       (2)      (2)        (4)         (2)        (4)      (2) 41256
          256K x    256K x     44256      41256       44256
            9         9

  3MB       (2)      (2)        (4)         (2)       NONE        NONE
          256K x    256K x    441000      411000
            9         9

  3MB     (2) 1M    NONE        (4)         (2)        (4)      (2) 41256
           x 9                 44256      41256       44256

  4MB     (2) 1M    (2) 1M     NONE        NONE       NONE        NONE
           x 9       x 9

  4MB      NONE     NONE        (4)         (2)        (4)         (2)
                              441000      411000     441000      411000

  5MB     (2) 1M    (2) 1M      (4)         (2)        (4)      (2) 41256
           x 9       x 9       44256      41256       44256

  5MB       (2)      (2)        (4)         (2)        (4)         (2)
          256K x    256K x    441000      411000     441000      411000
            9         9

  6MB     (2) 1M    (2) 1M      (4)         (2)       NONE        NONE
           x 9       x 9      441000      411000

  6MB     (2) 1M    NONE        (4)         (2)        (4)         (2)
           x 9                441000      411000     441000      411000

  8MB     (2) 1M    (2) 1M      (4)         (2)        (4)         (2)
           x 9       x 9      441000      411000     441000      411000

  10MB    (2) 1M    (2) 4M     NONE        NONE       NONE        NONE
           x 9       x 9

  12MB    (2) 4M    NONE        (4)         (2)        (4)         (2)
           x 9                441000      411000     441000      411000

  16MB    (2) 4M    (2) 4M     NONE        NONE       NONE        NONE
           x 9       x 9

                  DRAM JUMPER CONFIGURATION

  Size     JP4      JP5      JP6      JP7     JP8      JP9

   1MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   1MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

   2MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   3MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   3MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

   4MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   4MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

   5MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   5MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

   6MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

   6MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

   8MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

  10MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

  12MB    1 & 2    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2

  16MB    2 & 3    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3

  Note:Pins designated should be in the closed position.

