
DATAEXPERT CORPORATION

OPTI-495SX-2VL

Device Type   Mainboard
Processor     80386DX/CX486DLC/CX486DLC/80486SX/80486DX
Processor     8/10/12/16/20/25/33/40/50(internal)/50/60/66(internal)/66/75
Speed
              (internal)/80(internal)/100(internal)/120(internal)/75/90MHz
Chip Set      OPTI
Maximum       32MB
Onboard
Memory
Cache         64/128/256KB
BIOS          AMI
Dimensions    254mm x 218mm
I/O Options   32-bit VESA local bus slots (2)
NPU options   80387, CX87DLC

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         J1       Reset switch                J5

  Speaker                     J2       External battery           JP35

  Turbo switch                J3       32-bit VESA local bus   SL1  SL2
                                       slots

  Turbo LED                   J4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP2          Unidentified
      alter

     Factory configured - do not           JP2          Unidentified
      alter

     Factory configured - do not           JP4          Unidentified
      alter

     Factory configured - do not           JP5          Unidentified
      alter

     Factory configured - do not           JP6          Unidentified
      alter

     Factory configured - do not          JP17          Unidentified
      alter

     Factory configured - do not          JP18          Unidentified
      alter

     Factory configured - do not          JP19          Unidentified
      alter

     Factory configured - do not          JP20          Unidentified
      alter

     Factory configured - do not          JP21          Unidentified
      alter

     Factory configured - do not          JP22          Unidentified
      alter

     Factory configured - do not          JP23          Unidentified
      alter

     Factory configured - do not           JP4          Unidentified
      alter

     Factory configured - do not          JP31          Unidentified
      alter

      Monitor type select color            JP34             Closed

      Monitor type select monochrome       JP34              Open

     CMOS memory normal operation         JP35        Pins 2 & 3 closed

      CMOS memory clear                    JP35        Pins 3 & 4 closed

      Battery type select external         JP35             Closed

      80387 PGA installed                  JP36             Closed

      80387 PQFP installed                 JP36              Open

     Factory configured - do not           S1           Unidentified
      alter

     Factory configured - do not           S2           Unidentified
      alter

     Factory configured - do not           S3           Unidentified
      alter

              SIMM 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

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

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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 32K x 8

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

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

                        CACHE JUMPER CONFIGURATION

     Size          JP25            JP26          JP27            JP28

     64KB        Pins 2 & 3        Open          Open            Open
                  closed

    128KB        Pins 1 & 2        Open         Closed          Closed
                  closed

    256KB        Pins 2 & 3       Closed        Closed          Closed
                  closed

         CPU TYPE SELECTION

       Type              JP7

  80386DX (PQFP)        Open

  80386DX (PGA)        Closed

  CX486DLC (PGA)       Closed

    CX 486DLC          Closed

                            CPU TYPE SELECTION

     Type          JP1       JP10       JP11     JP12     JP16      JP33

  80386DX-25      Open      Closed     1 & 2    2 & 3     2 & 3    1 & 2

  80386DX-33     Closed      Open      1 & 2    2 & 3     2 & 3    1 & 2

  80386DX-40      Open       Open      1 & 2    2 & 3     2 & 3    1 & 2

  CX486DLC-33    Closed      Open      1 & 2    2 & 3     2 & 3    1 & 2

  CX486DLC-40     Open       Open      1 & 2    2 & 3     2 & 3    1 & 2

  80486SX-25      Open      Closed     2 & 3    1 & 2     1 & 2    2 & 3

  80486DX-33     Closed      Open      2 & 3    1 & 2     1 & 2    2 & 3

  80486DX-50      Open      Closed     1 & 2    1 & 2     1 & 2    2 & 3

  Note: Pins designated should be in the closed position.

                     CPU SPEED SELECTION (80486 ONLY)

       Type               JP8               JP29               JP30

      80486SX             Open            Pins 2 & 3           Open
                                           closed

      80487SX          Pins 2 & 3         Pins 1 & 2          Closed
                         closed            closed

      80486DX          Pins 1 & 2         Pins 1 & 2          Closed
                         closed            closed

