
AIM MOTHERBOARD COMPANY

486 VESA

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  20/25/33/50(internal)/50/66(internal)MHz
Chip Set         UNI
Max. Onboard DRAM128MB
Cache            32/64/128/256KB
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J4        Turbo switch              JP17

  Power LED & keylock         J5        32-bit VESA Local          S1
                                        bus slots

  Speaker                     J6        32-bit VESA Local          S2
                                        bus slots

  Reset switch               JP18       32-bit VESA Local          S3
                                        bus slots

  Turbo LED                  JP16

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP1             Closed

      Monitor type select monochrome          JP1              Open

     CMOS memory normal operation            JP2           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP2           pins 2 & 3
                                                              closed

     Factory configured - do not             JP20            Closed
      alter

     V-L bus clock select - normal           JP43          pins 2 & 3
                                                              closed

      V-L bus clock select - adjusted         JP43          pins 1 & 2
                                                              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) 1M x 9     (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      17MB        (4) 4M x 9     (4) 256K x 9

      20MB        (4) 4M x 9      (4) 1M x 9

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

      64MB        (4) 16M x 9        NONE

      65MB        (4) 16M x 9    (4) 256K x 9

      68MB        (4) 16M x 9     (4) 4M x 9

      80MB        (4) 16M x 9     (4) 4M x 9

     128MB        (4) 16M x 9    (4) 16M x 9

                          CPU TYPE CONFIGURATION

      Type                JP4                JP19              JP44

     80486SX       pins 5 & 6 closed         Open           pins 2 & 3
                                                              closed

     80487SX       pins 2 & 3, 4 & 5,        Open           pins 2 & 3
                      6 & 7 closed                            closed

   80486DX/33      pins 1 & 2, 4 & 5,        Open           pins 2 & 3
                      6 & 7 closed                            closed

   80486DX/50      pins 1 & 2, 4 & 5,       Closed          pins 1 & 2
                      6 & 7 closed                            closed

    80486DX2       pins 1 & 2, 4 & 5,        Open           pins 2 & 3
                      6 & 7 closed                            closed

              CPU SPEED CONFIGURATION

   Speed       JP29         JP30          JP31

   20MHz       Open        Closed        Closed

   25Mhz      Closed        Open         Closed

   33MHz      Closed       Closed         Open

  50i MHz      Open        Closed         Open

   50MHz      Closed        Open         Closed

  66i MHz     Closed       Closed         Open

                        CACHE JUMPER CONFIGURATION

    Size          JP6           JP7            JP9             JP11

    32KB         Open           Open          Open          pins 2 & 3
                                                              closed

    64KB         Open          Closed         Open          pins 1 & 2
                                                              closed

   128KB         Open          Closed        Closed      pins 1 & 2 and 3
                                                            & 4 closed

   256KB        Closed         Closed        Closed      pins 1 & 2 and 4
                                                            & 5 closed

                            VESA CONFIGURATION

     Setting             JP40              JP41               JP42

  V-L bus master         Open              Open               Open

  V-L bus slave         Closed            Closed             Closed

