
AMERICAN MEGATRENDS, INC.

80386 25/33 AT MARK II

Processor         80386DX
Processor Speed   25/33MHz
Chip Set          C & T
Max. Onboard DRAM 20MB
Cache             64KB
BIOS              AMI
Dimensions        355mm x 304mm
I/O Options       32-bit external memory card slot
NPU Options       80387/3167

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  Turbo LED                  J1       Power LED & keylock          J8

  Reset switch               J2       External battery             J9

  Speaker                    J7       32-bit external memory       S1
                                      card

                        USER CONFIGURABLE SETTINGS

                Function                     Switch          Position

     Factory configured - do not            SW1/1             Off
      alter

     Monitor type select monochrome         SW1/2             Off

      Monitor type select color              SW1/2              On

      Note: Cache is factory installed and is not configurable. The size
      and location of cache and tag are unidentified.

                            DRAM CONFIGURATION

         Size                    Bank 1                    Bank 2

          1MB                  (36) 41256                   NONE

          1MB                     NONE                  (4) 256K x 9

          2MB                  (36) 41256               (4) 256K x 9

          4MB                  (36) 411000                  NONE

          4MB                     NONE                   (4) 1M x 9

          5MB                  (36) 41256                (4) 1M x 9

          5MB                  (36) 411000              (4) 256K x 9

          8MB                  (36) 411000               (4) 1M x 9

         16MB                     NONE                   (4) 4M x 9

         17MB                  (36) 41256                (4) 4M x 9

         20MB                  (36) 411000               (4) 4M x 9

  Note: There were two versions of this board made, one that had 1MB of
  DIPP DRAM installed and one that had 4MB of DIPP DRAM installed. The
  1MB version could be upgraded by the factory to support 4MB of DIPP
  DRAM.

                         DRAM JUMPER CONFIGURATION

         Size                     J26                       J27

          1MB                    Open               pins 1 & 2 and 3 & 4
                                                          closed

          1MB                    Open               pins 2 & 3 and 4 & 5
                                                          closed

          2MB                    Open               pins 1 & 2 and 3 & 4
                                                          closed

          4MB                    Open               pins 1 & 2 and 3 & 4
                                                          closed

          4MB                    Open               pins 2 & 3 and 4 & 5
                                                          closed

          5MB                    Open               pins 1 & 2 and 3 & 4
                                                          closed

          5MB                    Open               pins 2 & 3 and 4 & 5
                                                          closed

          8MB                    Open               pins 2 & 3 and 4 & 5
                                                          closed

         16MB              pins 1 & 2 closed        pins 2 & 3 and 4 & 5
                                                          closed

         17MB              pins 1 & 2 closed        pins 1 & 2 and 3 & 4
                                                          closed

         20MB              pins 1 & 2 closed        pins 1 & 2 and 3 & 4
                                                          closed

