
DATAEXPERT CORPORATION

OPTI-495SX

Device Type            Mainboard
Processor              80386DX/80486SX/80487SX/80486DX/80486DX2/ODP486
Processor Speed        25/33/40/50(internal)/50/66(internal)MHz
Chip Set               OPTI495SX
Maximum Onboard Memory 32MB
Cache                  64/128/256KB
BIOS                   AMI
Dimensions             254mm x 218mm
I/O Options            32-bit VESA local bus slot
NPU Options            80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         J1       Reset switch                J5

  Speaker                     J2       External battery           JP18

  Turbo switch                J3       32-bit VESA local bus      SL1
                                       slot

  Turbo LED                   J4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP8          Unidentified
      alter

     Factory configured - do not           JP9          Unidentified
      alter

     Factory configured - do not          JP10          Unidentified
      alter

     Factory configured - do not          JP11          Unidentified
      alter

      Monitor type select color            JP17             Closed

      Monitor type select monochrome       JP17              Open

     CMOS memory normal operation         JP18        Pins 2 & 3 closed

      CMOS memory clear                    JP18        Pins 3 & 4 closed

      Battery type select external         JP18             Closed

     Factory configured - do not          JP23          Unidentified
      alter

     Factory configured - do not          JP29          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) 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          JP6            JP7           JP12            JP13

     64KB          Open           Open          Open          Pins 2 & 3
                                                               closed

    128KB          Open          Closed        Closed         Pins 1 & 2
                                                               closed

    256KB         Closed         Closed        Closed         Pins 2 & 3
                                                               closed

                            CPU SPEED SELECTION

     Speed          JP14           JP15           JP16           JP22

     25MHz        Pins 1 & 2       Open          Closed          N/A
                   closed

  33MHz (386)     Pins 2 & 3      Closed          Open          Closed
                   closed

     33MHz        Pins 1 & 2      Closed          Open           N/A
                   closed

  40MHz (386)     Pins 2 & 3       Open           Open           Open
                   closed

    50iMHz        Pins 1 & 2       Open          Closed          N/A
                   closed

     50MHz        Pins 2 & 3       Open          Closed          N/A
                   closed

    66iMHz        Pins 1 & 2      Closed          Open           N/A
                   closed

                            CPU TYPE SELECTION

       Type               JP1               JP2                JP4

      80486SX             Open           Pins 2 & 3            Open
                                           closed

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

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

     80486DX2            Closed          Pins 1 & 2         Pins 1 & 2
                                           closed             closed

      ODP486             Closed          Pins 1 & 2         Pins 2 & 3
                                           closed             closed

                            CPU TYPE SELECTION

      Type            JP3            JP5          JP21           JP24

  80386 (PQFP)     Pins 2 & 3     Pins 1 & 2      Open        Pins 1 & 2
                     closed        closed                       closed

   80486 (PGA)     Pins 1 & 2     Pins 2 & 3     Closed       Pins 2 & 3
                     closed        closed                       closed

      80486        Pins 1 & 2     Pins 2 & 3      Open        Pins 2 & 3
    (PQFPGA)         closed        closed                       closed

