
ABIT COMPUTER CORPORATION

AR4

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   40/50(internal)/60/66(internal)MHz
Chip Set          ALI
Max. Onboard DRAM 32MB
Cache             None
BIOS              Award
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                    Location

  External battery           J4       Turbo switch/LED             J21

  Reset switch              J19       Keylock                      J22

  Speaker                   J20

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP1           pins 2 & 3
                                                              closed

      Monitor type select monochrome          JP1           pins 1 & 2
                                                              closed

      Factory configured - do not             JP2               on
      alter

      CPU set at 80486SX (PQFP)               JP7           pins 1 & 2
                                                              closed

      CPU set at 80486SX (PGA)                JP7           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

      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

      CPU Type               JP4                  JP5

       80486SX               Open           pin 1 & 2 closed

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

       80486DX         pins 2 & 3 closed   pins 2 & 3 closed

      80486DX2         pins 2 & 3 closed   pins 2 & 3 closed

                  AT BUS CLOCK CONFIGURATION

        Speed                JP3                  JP6

        40MHz          pins 2 & 3 closed   pins 1 & 2 closed

        50MHz          pins 1 & 2 closed   pins 2 & 3 closed

        66MHz          pins 1 & 2 closed   pins 1 & 2 closed

