AMERICAN MEGATRENDS, INC.

MARK IV AT Convertible Screamer

Processor         80386DX/80486DX
Processor Speed   25/33/40MHz
Chip Set          C & T
Max. Onboard DRAM 64MB
Cache             64/256KB
BIOS              AMI
Dimensions        355mm x 289mm
I/O Options       32-bit external CPU/NPU card slot
NPU Options       80387/3167/4167 (on 32-bit external CPU/NPU card)

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  32-bit external           CN1        Turbo LED                  J6
  CPU/NPU card

  External battery           J1        Power LED & keylock        J7

  Speaker                    J4        Diagnostic LED             J8

  Reset switch               J5        Auxiliary keyboard         JX

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Factory configured - do not            J2                 Open
      alter

  »   Auxiliary BIOS disabled                J9                 Open

      Auxiliary BIOS enabled                 J9                Closed
      (27512 EPROM installed at
      U1)

  »   Factory configured - do not           SW1/1               Off
      alter

  »   Monitor type select                   SW1/2               Off
      monochrome

      Monitor type select color             SW1/2                On

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9       NONE           NONE

     4MB         (4) 1M x 9        NONE           NONE           NONE

     4MB         (4) 1M x 9        NONE           NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9    (4) 1M x 9        NONE

     8MB         (4) 1M x 9     (4) 1M x 9        NONE           NONE

     8MB         (4) 1M x 9     (4) 1M x 9        NONE           NONE

     10MB       (4) 256K x 9   (4) 256K x 9    (4) 1M x 9     (4) 1M x 9

     12MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     12MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     16MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB        (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB        (4) 4M x 9        NONE           NONE           NONE

     18MB       (4) 256K x 9   (4) 256K x 9    (4) 4M x 9        NONE

     24MB        (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     24MB        (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     32MB        (4) 4M x 9     (4) 4M x 9        NONE           NONE

     34MB       (4) 256K x 9   (4) 256K x 9    (4) 4M x 9     (4) 4M x 9

     36MB        (4) 4M x 9     (4) 4M x 9     (4) 1M x 9        NONE

     40MB        (4) 1M x 9     (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     40MB        (4) 1M x 9     (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     40MB        (4) 4M x 9     (4) 4M x 9     (4) 1M x 9     (4) 1M x 9

     48MB        (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     64MB        (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

  DRAM JUMPER CONFIGURATION

     Size            J3

      1MB          closed

      2MB          closed

      4MB          closed

      4MB           open

      6MB          closed

      8MB          closed

                     DRAM JUMPER CONFIGURATION (CON'T)

                Size                                  J3

                8MB                                  open

                10MB                                closed

                12MB                                closed

                12MB                                 Open

                16MB                                Closed

                16MB                                 Open

                16MB                                 Open

                18MB                                Closed

                24MB                                Closed

                24MB                                 Open

                32MB                                 Open

                34MB                                Closed

                36MB                                 Open

                40MB                                Closed

                40MB                                 Open

                40MB                                 Open

                48MB                                 Open

                64MB                                 Open

  Note:If jumper J3 is open, then PAL M00B2411 must be installed at U68
  (factory default).

  If jumper J3 is closed, then PAL M01B2411 must be installed at U68.

     CACHE CONFIGURATION

     Size          Bank 0

     64KB        (8) 8K x 8

     256KB      (8) 32K x 8