ABIT COMPUTER CORPORATION

486DX-AX4

Processor            80486SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             SIS
Max. Onboard DRAM    32MB
Cache                64/128/256KB
BIOS                 AMI
Dimensions           245mm x 220mm
I/O Options          None
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                  JW3

  Power LED & keylock         JW1       Reset switch               JW4

  Speaker                     JW2       Turbo switch               JW5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not alter        JP7             Open

  »   Factory configured - do not alter        JP9             Open

  »   CMOS memory normal operation             JP8           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP8           pins 2 & 3
                                                              closed

  »   Monitor type select color               JP10            Closed

      Monitor type select monochrome          JP10             Open

  »   Factory configured - do not alter       JP14             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

      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                 JPX1

         64KB           pins 1 - 8 closed

        128KB          pins 5 - 12 closed

        256KB          pins 7 - 14 closed

              CPU TYPE CONFIGURATION

      Type             JP11             JP12

     80486SX      Not installed        Closed

     80486DX        Installed           Open

    80486DX2        Installed           Open