UNIDENTIFIED

486SX/DX/DX2

Processor        80486SX/80487SX/ODP80486SX/80486DX/80486DX2
Processor Speed  16/20/25/33/50/55i/66iMHz
Chip Set         OPTI
Max. Onboard DRAM32MB
Cache            64/128KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      None
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                  J4

  Speaker                      J2       Turbo switch               J5

  Power LED & keylock          J3       Reset switch               J6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color               JP1             Closed

      Monitor type select monochrome          JP1              Open

  »   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             JP8              N/A
      alter

  »   Power on clock select CLKI/4            JP9           pins 1 & 2
                                                              closed

      Power on clock select CLKI/6            JP9           pins 2 & 3
                                                              closed

  »   CMOS memory normal operation            JP10          pins 2 & 3
                                                              closed

      CMOS memory clear                       JP10          pins 1 & 2
                                                              closed

  »   Factory configured - do not             JP12             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         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

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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1         TAG0           TAG1

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8     (1) 16K x 4

     128KB      (4) 32K x 8    (4) 32K x 8    (1) 8K x 8     (1) 16K x 4

                        CACHE JUMPER CONFIGURATION

      Size               JP2               JP3                 JP7

      64KB            pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      128KB           pins 2 & 3        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

                    CPU TYPE CONFIGURATION

        Type                 JP13                 JP14

       80486SX         pins 2 & 3 closed   pins 2 & 3 closed

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

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

         CPU SPEED CONFIGURATION

        Speed                JP11

        25MHz         pins 2 & 3 closed

        33MHz         pins 2 & 3 closed

        40MHz         pins 1 & 2 closed

       50iMHz         pins 1 & 2 closed

       66iMhz         pins 2 & 3 closed