AMERICAN MEGATRENDS, INC.

AMI-386XT SERIES-6

Processor              80386DX
Processor Speed        8/16/20/25MHz
Chip Set               AMI
Max. Onboard DRAM      None (16MB on 32-bit external memory cards)
Cache                  64KB
BIOS                   AMI
Dimensions             330mm x 218mm
I/O Options            32-bit external memory card slot
NPU Options            80387DX

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  Turbo LED                  J1       Power LED & keylock         J20

  Reset switch               J2       External battery            J21

  Speaker                   J19       32-bit external memory       S1
                                      card

                                       USER CONFIGURABLE SETTINGS

                           Function                               Jumper/Switch          Position

  »   BIOS type select 27128                                           J4           pins 1 & 2 closed

      BIOS type select 27256                                           J4           pins 2 & 3 closed

  »   Monitor type select color                                       SW1/1                 On

      Monitor type select monochrome                                  SW1/1                Off

  »   CPU speed select 8MHz                                           SW1/2                 On

      CPU speed select 16/20/25MHz                                    SW1/2                Off

  »   NPU disabled                                                    SW1/3                 On

      NPU enabled                                                     SW1/3                Off

      Note : The cache is factory installed and can not be altered.

      The size and location of the cache and tag chips are unknown.

[Image]

       DRAM CONFIGURATION (CARD 1)

     Size        Bank 0        Bank 1

     1MB        (36) 41256      None

     2MB        (36) 41256   (36) 41256

                    DRAM SWITCH CONFIGURATION (CARD 1)

     Size       Base Memory       SW2/1          SW2/2          SW2/3

     512KB         512KB           Off            Off            Off

     640KB         640KB           Off            On             Off

     896KB         512KB           Off            Off            On

    1024KB         640KB           Off            On             On

    1536KB         512KB            On            Off            Off

    1664KB         640KB            On            On             Off

    1920KB         512KB            On            Off            On

    1920KB         640KB            On            On             On

                                                                    [Image]

        DRAM CONFIGURATION (CARD-2)

     Size          Bank 0        Bank 1

      4MB        (36) 411000      None

      8MB        (36) 411000   (36) 411000

                    DRAM SWITCH CONFIGURATION (CARD-2)

     Size       Base Memory       SW3/1          SW3/2          SW3/3

    3584KB         512KB           Off            Off            Off

    3712KB         640KB           Off            On             Off

    3968KB         512KB           Off            Off            On

    4096KB         640KB           Off            On             On

    7680KB         512KB            On            Off            Off

    7808KB         640KB            On            On             Off

    8064KB         512KB            On            Off            On

    8192KB         640KB            On            On             On

[Image]

                     DAUGHTER BOARD DRAM CONFIGURATION

         Size                   Bank 0                    Bank 1

          4MB                 (36) 411000                  None

          8MB                 (36) 411000               (36) 411000

  Note: Each system memory card can be connected to a daughter board, for
  an additional 4 to 8MB of memory. The daughter board's Strips J2 & J3
  (component side) plug into the J2 & J3 Strips (solder side) on the
  system memory boards.

            DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 1

       Size            Base Memory           SW2/1             SW2/2

      5632KB              512KB               Off               Off

      5760KB              640KB               Off               On

      9728KB              512KB               On                Off

      9856KB              640KB               On                On

  Note: The system memory card must be filled to maximum capacity (2MB)
  to implement the daughter board. When the daughter board is plugged
  into the system memory board the switches previously used to set the
  base memory size on the system memory card is then used to set the base
  memory size of the daughter board.

            DAUGHTER BOARD DRAM SWITCH CONFIGURATION FOR CARD 2

       Size         Base Memory      SW3/1         SW3/2         SW3/3

     11776KB           512KB          Off           Off           N/A

     11904KB           640KB          Off            On           N/A

     14848KB           512KB           On           Off           On

     14976KB           640KB           On            On           On

     15744KB           512KB           On           Off           Off

     15872KB           640KB           On            On           Off

  Note: The system memory card must be filled to maximum capacity (8MB)
  to implement the daughter board. When the daughter board is plugged
  into the system memory board, the switches previously used to set the
  base memory size on the system memory card are then used to set the
  base memory size of the daughter board.