
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

