
UNIDENTIFIED

OPTI-495SX 3/486WB CACHE

Processor        80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         OPTI
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387DX/CX487DLC

[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                     Jumper          Position

     Factory configured - do not             JP2              N/A
      alter

     Factory configured - do not             JP3              N/A
      alter

     Factory configured - do not             JP4              N/A
      alter

     Factory configured - do not             JP5              N/A
      alter

     Factory configured - do not             JP6              N/A
      alter

     Factory configured - do not             JP17             N/A
      alter

     Factory configured - do not             JP18             N/A
      alter

     Factory configured - do not             JP19             N/A
      alter

     Factory configured - do not             JP20             N/A
      alter

     Factory configured - do not             JP21             N/A
      alter

     Factory configured - do not             JP22             N/A
      alter

     Factory configured - do not             JP23             N/A
      alter

     Factory configured - do not             JP24             N/A
      alter

     Factory configured - do not             JP31             N/A
      alter

     Monitor type select monochrome          JP34             Open

      Monitor type select color               JP34            Closed

     CMOS memory normal operation            JP35          pins 2 & 3
                                                              closed

      CMOS memory clear                       JP35          pins 3 & 4
                                                              closed

      Battery type select external            JP35            Closed

     NPU type select 80387 PQFP              JP36             Open

      NPU type select 80387 PGA               JP36            Closed

     Factory configured - do not              S1              N/A
      alter

     Factory configured - do not              S2              N/A
      alter

     Factory configured - do not              S3              N/A
      alter

              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      (4) 4M x 9

      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

                        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 CONFIGURATION

       Type              JP7

  80386DX (PQFP)        Open

  80386DX (PGA)        Closed

     CX486DLC          Closed

   80486 (PQFP)         Open

   80486 (PGA)         Closed

                    CPU TYPE CONFIGURATION (80486 PGA)

       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

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

              CPU SPEED CONFIGURATION (80386/CX486DLC)

  Speed      JP1      JP10     JP11      JP12      JP16      JP33

  25MHz     Open     Closed    1 & 2     2 & 3    2 & 3     1 & 2

  33MHz     Closed    Open     1 & 2     2 & 3    2 & 3     1 & 2

  40MHz     Open      Open     1 & 2     2 & 3    2 & 3     1 & 2

  Note: Pins designated should be in the closed position.

                  CPU SPEED CONFIGURATION (80486)

  Speed      JP1      JP10     JP11      JP12      JP16      JP33

  25MHz     Open     Closed    2 & 3     1 & 2    1 & 2     2 & 3

  33MHz     Closed    Open     2 & 3     1 & 2    1 & 2     2 & 3

  50iMHz    Open     Closed    2 & 3     1 & 2    1 & 2     2 & 3

  50MHz     Open     Closed    1 & 2     1 & 2    1 & 2     2 & 3

  66iMHz    Closed    Open     2 & 3     1 & 2    1 & 2     2 & 3

  Note: Pins designated should be in the closed position.

