
AST RESEARCH, INC.

PREMIUM II 386SX/25

MODELS 202373-001 & 202373-002

Processor                    80386SX(on external CPU/Memory module)
Processor Speed              25MHz
Chip Set                     AST
Max. Onboard DRAM            None (16MB on external CPU/Memory module)
Cache                        None (16KB on external CPU/Memory module)
BIOS                         AST
Dimensions                   344mm x 250mm
I/O Options                  16-bit external CPU/Memory module slot

                             16-bit external Memory module slot (2)

                             bus mouse port, floppy drive interface

                             IDE interface, parallel port, serial port (2),
                             SVGA port
NPU Options                  80387SX(on external CPU/Memory module)

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  SVGA port                    CN1      Front panel switches       P5
                                        & LEDs

  Bus mouse port               CN2      Speaker                    P6

  Serial port 1 (COM1)         CN3      External battery           P8

  Parallel port                CN4      IDE interface              P11

  Serial port 2 (COM2)         J15      Fan power                 P101

  VGA pass-through             J18      16-bit external            S1
                                        CPU/Memory module

  Floppy drive interface       P3       16-bit external            S2
                                        Memory module slot

  Third floppy drive           P4       16-bit external            S3
  interface                             Memory module slot

                        USER CONFIGURABLE SETTINGS

                 Function                   Switch SW1       Position

     VGA port enabled                       switch 1         closed

      VGA port disabled                      switch 1          open

     Password check enabled                 switch 2          open

      Password check disabled                switch 2         closed

     Factory configured - do not alter      switch 3          open

     Factory configured - do not alter      switch 4          open

     Factory configured - do not alter      switch 5         closed

     Factory configured - do not alter      switch 6         closed

     Monitor type select PS/2 style         switch 7         closed

      Monitor type select AT style           switch 7          open

     Monitor type select VGA or             switch 8          open
      fixed-frequency

      Monitor type select                    switch 8         closed
      multi-frequency

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Parity check enabled                    E1              closed

      Parity check disabled                   E1               open

  Note:AST CPU/Memory module part number is 202438-004.

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2          Bank 3

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

      2MB        (1) 1M x 9     (1) 1M x 9       NONE            NONE

      3MB        (1) 1M x 9     (1) 1M x 9    (1) 1M x 9         NONE

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

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

      5MB        (1) 1M x 9     (1) 4M x 9       NONE            NONE

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

      7MB        (1) 1M x 9     (1) 1M x 9    (1) 1M x 9      (1) 4M x 9

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

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

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

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

     13MB        (1) 1M x 9     (1) 4M x 9    (1) 4M x 9      (1) 4M x 9

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

  Notes:16KB of SRAM Cache is on the CPU/Memory module. 128KB of DRAM is
  reserved for System

  and VGA BIOS shadowing and cannot be disabled. Up to two of the
  following memory boards

  may be installed in addition to the CPU/Memory module: AST part numbers
  202275-001,

  202275-004, 202275-006, 202387-001, or 202387-005.

