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.