AST RESEARCH, INC.

PREMIUM/386

Processor               80386DX
Processor Speed         20MHz
Chip Set                AST
Max. Onboard DRAM       None
Cache                   None
BIOS                    AST
Dimensions              330mm x 218mm
I/O Options             32-bit external memory card slot

                        Parallel port

                        Serial port (2)

                        SMART expansion/16-bit ISA expansion slots (3)
NPU Options             80287/80387

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  32-bit external            J7        Front panel                P5
  memory card                          switches & LEDs

  SMART expansion or    S1, S2 & S3    Speaker                    P6
  16-bit ISA

  Serial port 2              P2        External battery           P8
  header

  Floppy drive               P3        Optional ROM              U88
  interface (A: and                    (even)
  B:)

  Third floppy drive         P4        Optional ROM (odd)        U89
  interface

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Serial port 1              COM1      Parallel port              LPT1

  Serial port 2              COM2      Keyboard                   KYBD

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not alter        E1             closed

  »   Factory configured - do not alter        E2             closed

  »   Factory configured - do not alter        E3             closed

  »   Factory configured - do not alter        E4              open

  »   Factory configured - do not alter        E5             closed

  »   Factory configured - do not alter        E6              open

  Note:Jumper E6 may not appear on all board revisions.

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                   Switch SW1        Position

  »   Parity check enabled                  switch 7          closed

      Parity check disabled                 switch 7           open

  »   Factory configured - do not alter     switch 8           open

                            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

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

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

     5MB        (4) 256K x 9   (4) 1M x 9        NONE           NONE

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

     7MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9   (4) 1M x 9

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

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

     13MB       (4) 256K x 9   (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

  Note:Bank 0 must be populated with 256KB SIMMs.

                             DRAM SWITCH CONFIGURATION

  Size   SW1/switch  SW1/switch   SW1/switch   SW1/switch   SW1/switch   SW1/switch
             1           2            3            4            5            6

  1MB      open         open         open         open         open        open

  2MB      open        closed        open         open         open        open

  3MB      open        closed        open        closed        open        open

  4MB      open        closed        open        closed        open       closed

  5MB     closed        open         open         open         open        open

  6MB      open        closed       closed        open         open        open

  7MB      open        closed        open        closed       closed       open

  9MB     closed        open        closed        open         open        open

  10MB     open        closed       closed        open        closed       open

  13MB    closed        open        closed        open         open        open