
DATAEXPERT CORPORATION

OPTI-495XLC 3/486WB CACHE

Processor        80386DX/80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  25/33/40/50(internal)/50/66(internal)/MHz
Chip Set         OPTi
Max. Onboard DRAM64MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         J1       Turbo LED                   J5

  Speaker                     J2       External battery            J6

  Turbo switch                J3       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J4       32-bit VESA Local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation             J6           pins 2 & 3
      (Internal battery)                                      closed

      CMOS memory clear                        J6           pins 3 & 4
                                                              closed

     Monitor type select color               JP21            Closed

      Monitor type select monochrome          JP21             Open

     Factory configured - do not             JP23             N/A
      alter

     Battery type select - NI-CD             JP26          pins 2 & 3
      recharge                                                closed

      Battery type select - Lithum            JP26          pins 1 & 2
      discharge                                               closed

              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

      17MB        (4) 256K x 9    (4) 4M x 9

      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

      64MB        (4) 16M x 9        NONE

                    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

                        CACHE JUMPER CONFIGURATION

    Size          JP10            JP11           JP16           JP17

    64KB       pins 2 & 3      pins 2 & 3        Open           Open
                 closed          closed

   128KB       pins 1 & 2      pins 1 & 2       Closed          Open
                 closed          closed

   256KB       pins 2 & 3      pins 2 & 3       Closed         Closed
                 closed          closed

                         80386/80486 CONFIGURATION

    Type         JP14          JP15        JP20        JP25       JP30

    80386        Open          Open       pins 2 &   pins 1 &    pins 2 &
                                             3          2           3

    80486       Closed        Closed      pins 1 &   pins 2 &    pins 1 &
                                             2          3           2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

        Type                JP2              JP18              JP19

    80486SX (PGA)           Open             Open            pins 2 & 3
                                                              closed

   80486SX (PQFP)           Open            Closed           pins 2 & 3
                                                              closed

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

      80486DX2           pins 1 & 2         Closed           pins 1 & 2
                           closed                             closed

  Pentium Overdrive      pins 2 & 3         Closed           pins 1 & 2
                           closed                             closed

                          CPU SPEED CONFIGURATION

       Speed          JP6        JP7         JP8        JP9       JP22

   80386DX/33MHz     Open       Open       Closed      pins 1     Open
                                                        & 2

   80486SX/25MHz     Open       Open        Open       pins 1    Closed
                                                        & 2

   80486SX/33MHz     Open       Open       Closed      pins 1     Open
                                                        & 2

   80486DX/25MHz     Open       Open        Open       pins 1    Closed
                                                        & 2

   80486DX/40MHz     Open      Closed      Closed      pins 1     Open
                                                        & 2

  80486DX/50i MHz    Open       Open        Open       pins 1    Closed
                                                        & 2

   80486DX/50MHz     Open      Closed       Open       pins 1     Open
                                                        & 2

  80486DX/66i MHz    Open       Open       Closed      pins 1     Open
                                                        & 2

  Note:Pins designated should be in the closed position.

