UNIDENTIFIED

486SX/DX/DX2

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         UMC
Max. Onboard DRAM64MB
Cache            64/128/256KB
BIOS             Award
Dimensions       254mm x 220mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Speaker                     J2       Reset switch                J6

  Power LED & keylock         J3       External battery           J11

  Turbo switch                J4       32-bit VESA local bus   SL1 & SL2
                                       slots

  Turbo LED                   J5

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

  »   PQFP CPU disabled                       JP8              Open

      PQFP CPU enabled                        JP8             Closed

  »   VESA video card select normal          JP16           pins 1 & 2
                                                              closed

      VESA video card select Power           JP16           pins 2 & 3
      A9000                                                   closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB         (4) 256K x 9         NONE

       1MB             NONE        (1) 256K x 36

       2MB         (4) 256K x 9    (1) 256K x 36

       4MB          (4) 1M x 9          NONE

       4MB             NONE         (1) 1M x 36

       5MB          (4) 1M x 9     (1) 256K x 36

       8MB          (4) 1M x 9      (1) 1M x 36

      16MB          (4) 4M x 9          NONE

      16MB             NONE         (1) 4M x 36

      17MB          (4) 4M x 9     (1) 256K x 36

      20MB          (4) 4M x 9      (1) 1M x 36

      32MB          (4) 4M x 9      (1) 4M x 36

      64MB         (4) 16M x 9          NONE

                    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          JP1            JP2             JP4             JP5

    64KB       pins 1 & 2     pins 1 & 2      pins 2 & 3      pins 1 & 2
                closed          closed         closed          closed

   128KB       pins 2 & 3     pins 2 & 3      pins 1 & 2      pins 1 & 2
                closed          closed         closed          closed

   256KB       pins 1 & 2     pins 1 & 2      pins 1 & 2      pins 2 & 3
                closed          closed         closed          closed

                          CPU TYPE CONFIGURATION

          Type                     JP6                      JP7

         80486SX            pins 2 & 3 closed               Open

         80487SX             pins 1 & 2, 3 & 4       pins 2 & 3 closed
                                  closed

         80486DX             pins 1 & 2, 3 & 4       pins 1 & 2 closed
                                  closed

        80486DX2             pins 1 & 2, 3 & 4       pins 1 & 2 closed
                                  closed

             CPU SPEED CONFIGURATION

  Speed      JP9       JP10      JP11      JP12

  16MHz     Closed    Closed    Closed    Closed

  20MHz      Open     Closed    Closed     Open

  25MHz     Closed     Open     Closed     Open

  33MHz     Closed    Closed     Open      Open

  40MHz      Open      Open     Closed     Open

  50iMHz    Closed     Open     Closed     Open

  50MHz      Open     Closed     Open      Open

  66iMHz    Closed    Closed     Open      Open

  BUS SPEED CONFIGURATION

  CPU speed        ID3

   <= 33MHz        Open

   > 33MHz        Closed