UNIDENTIFIED

80486

Processor        80486SX/80487SX/ODP486SX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/66(internal)MHz
Chip Set         OPTI
Max. Onboard DRAM32MB
Cache            None
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      None
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J17      External battery            J20

  Speaker                     J18      Turbo switch                J21

  Reset switch                J19      Turbo LED                   J22

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

  »   CPU type select PGA or PQFP              J23             Open
      installed

      CPU type select PQFP disabled &          J23            Closed
      PGA enabled

  »   Monitor type select monochrome           JP3             Open

      Monitor type select color/EGA/VGA        JP3            Closed

  »   CMOS memory normal operation             JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP5           pins 2 & 3
                                                              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

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

                          CPU TYPE CONFIGURATION

       Type           JP101         JP102         JP103         JP104

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

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

     ODP486SX        Closed       pins 1 & 2    pins 2 & 3    pins 2 & 3
                                   closed        closed         closed

   80486DX/DX2       Closed       pins 1 & 2    pins 1 & 2    pins 2 & 3
                                   closed        closed         closed

         CPU SPEED CONFIGURATION

  Speed      J24        J25       J26

  20MHz      Open     Closed    Closed

  25MHz     Closed     Open     Closed

  33MHz     Closed    Closed     Open

  50iMHz    Closed     Open     Closed

  66iMHz    Closed    Closed     Open