
DATAEXPERT CORPORATION

OPTI-495WB Ver 2.0

Processor         80486SX/80486DX/ODP486SX
Processor Speed   20/25/33/50MHz
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

  Power LED & keylock      J1       Turbo switch              J4

  Speaker                  J2       Turbo LED                 J5

  Reset switch             J3       External battery          J6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation             J6           pins 2 & 3
                                                              closed

      CMOS memory clear                        J6           pins 3 & 4
                                                              closed

     CPU speed select 20/25/33MHz            JP9           pins 2 & 3
                                                              closed

      CPU speed select 50MHz                  JP9           pins 1 & 2
                                                              closed

     Monitor type select color               JP10            Closed

      Monitor type select monochrome          JP10             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

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

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

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

      64KB        (4) 8K x 8      (4) 8K x 8      (1) 8K x 8

     128KB        (4) 32K x 8        NONE         (1) 8K x 8

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 32K x 8

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

                         CACHE JUMPER CONFIGURATION

  Size    JP4   JP5      JP6      JP7      JP13    JP15   JP16   JP17   JP18

  64KB    2 &   Open     Open     Open     Open    1 &    1 &    2 &    2 &
          3                                         2      2      3      3

  128KB   1 &   Open     Open    Closed   Closed   2 &    1 &    1 &    2 &
          2                                         3      2      2      3

  256KB   2 &  Closed    Open    Closed   Closed   1 &    2 &    1 &    2 &
          3                                         2      3      2      3

  512KB   1 &  Closed   Closed   Closed   Closed   2 &    2 &    1 &    2 &
          2                                         3      3      2      3

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP1               JP2                JP3

      80486SX             Open           pins 2 & 3            Open
                                           closed

     ODP486SX            Closed          pins 1 & 2         pins 1 & 2
                                           closed             closed

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

