
UNIDENTIFIED

OPTI 486-25/33

Processor         80486SX
Processor Speed   25/33
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128KB (external cache card)
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card, 32-bit external cache card
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  External battery           J1        Power LED & keylock        J27

  Turbo LED                  J25       Reset switch               SW1

  Speaker                    J26       32-bit external            SL1
                                       memory card

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP2             Closed

      Monitor type select monochrome          JP2              Open

     Cache enabled                         JP5, JP6           Open

      Cache disabled                        JP5, JP6          Closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9      NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9      NONE           NONE

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

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

     4MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9  (4) 256K x 9

     5MB        (4) 256K x 9   (4) 1M x 9        NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9   (4) 1M x 9        NONE

     7MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9   (4) 1M x 9

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

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

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     36MB       (4) 4M x 9     (4) 4M x 9     (4) 1M x 9        NONE

     40MB       (4) 4M x 9     (4) 4M x 9     (4) 1M x 9     (4) 1M x 9

  Note:Banks 2 & 3 are located on the external memory card..

                 EXTERNAL CACHE CARD JUMPER CONFIGURATION

    Size         JP1         JP2           JP3          JP4        JP5

    64KB        1 & 2        Open          Open        1 & 2      1 & 2

    128KB       2 & 3       Closed        Closed       2 & 3      2 & 3

  Note:Pins designated should be in the closed position. JP1-5 are
  located on the external cache card.

