DATAEXPERT CORPORATION

OPTI-486WB

Processor         80486SX/80486DX
Processor Speed   25/33MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128/256/512KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Speaker                    J1        Reset switch               J4

  Turbo switch               J2        External battery          J22

  Power LED & keylock        J3        Turbo LED                 JP1

  Note:On some board revisions, JP1, J2, and J4 are aligned to the left
  of the NPU.

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

  »   CMOS memory normal operation            J22           pins 2 & 3
                                                              closed

      CMOS memory clear                       J22           pins 3 & 4
                                                              closed

  »   Monitor type select color              JP12             Closed

      Monitor type select monochrome         JP12              Open

              DRAM CONFIGURATION

     Size          Bank 0          Bank 1

      1MB        (4) 256K x 9       NONE

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

      4MB        (4) 1M x 9         NONE

      5MB        (4) 256K x 9    (4) 1M x 9

      8MB        (4) 1M x 9      (4) 1M x 9

     16MB        (4) 4M x 9         NONE

     20MB        (4) 1M x 9      (4) 4M x 9

     32MB        (4) 4M x 9      (4) 4M x 9

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U34)      TAG (U35)

     64KB        (8) 8K x 8        NONE       (1) 8K x 8     (1) 64K x 1

     128KB       (8) 8K x 8     (8) 8K x 8    (1) 8K x 8     (1) 64K x 1

     256KB      (8) 32K x 8        NONE       (1) 32K x 8    (1) 64K x 1

     512KB      (8) 32K x 8    (8) 32K x 8    (1) 32K x 8    (1) 64K x 1

                   CACHE JUMPER CONFIGURATION

   Size        JP6        JP7        JP8        JP9       JP10

   64KB       Open       2 & 3      Open       Open       Open

   128KB     Closed      2 & 3      Open       Open      Closed

   256KB     Closed      2 & 3      Open      Closed     Closed

   512KB     Closed      1 & 2     Closed     Closed     Closed

  Note:Pins designated should be in the closed position.

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U34)      TAG (U35)

     64KB        (8) 8K x 8        NONE       (1) 8K x 8     (1) 64K x 1

     128KB       (8) 8K x 8     (8) 8K x 8    (1) 8K x 8     (1) 64K x 1

     256KB      (8) 32K x 8        NONE       (1) 32K x 8    (1) 64K x 1

     512KB      (8) 32K x 8    (8) 32K x 8    (1) 32K x 8    (1) 64K x 1

                          CPU TYPE CONFIGURATION

       Type               JP2                JP3               JP4

      80486SX             Open            pins 1 & 2           Open
                                           closed

      80486DX          pins 1 & 2         pins 2 & 3          Closed
                         closed            closed