UNIDENTIFIED

486 MOTHER BOARD

Processor              80486DX/80486DX2
Processor Speed        25/33/50(internal)/66(internal)MHz
Chip Set               OPTI
Video Chip Set         None
Maximum Onboard Memory 32MB
Maximum Video Memory   None
Cache                  64/256KB
BIOS                   AMI
Dimensions             220mm x 220mm
I/O Options            None
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                 JP11

  Speaker                     J17       Reset switch               SW1

  Power LED & keylock         J18       Turbo switch               SW2

                        USER CONFIGURABLE SETTINGS

                Function                      Label          Position

  ?   CMOS memory normal operation             JP1          Pins 2 & 3
                                                              closed

      CMOS memory clear                        JP1          Pins 1 & 2
                                                              closed

      Monitor type select monochrome           JP2            Closed

      Monitor type select CGA/EGA/VGA          JP2             Open

              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

      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          TAG

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

     256KB       (8) 32K x 8   (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

       Size              JP4                JP6                JP7

       64KB              Open              Open               Open

      256KB             Closed            Closed             Closed

  Note: Above jumpers are shown for location purposes only and may not be
  exact.