
AST RESEARCH, INC.

PREMIUM/486-25

Processor               80486DX
Processor Speed         25MHz
Chip Set                AST
Max. Onboard DRAM       None (36MB total on 32-bit external cards)
Cache                   None
BIOS                    AST
Dimensions              355mm x 251mm
I/O Options             Parallel port, serial ports (2), floppy drive
                        interface, IDE interface, 32-bit external CPU/NPU
                        card slot, 32-bit external memory card slots (2),
                        16-bit external expansion card slot
NPU Options             4167

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                 Location

  32-bit external           CN1        Auxiliary floppy           P4
  CPU/NPU card                         drive interface

  32-bit external           CN2        Power LED & reset          P5
  memory card                          switch

  32-bit external           CN3        Speaker                    P6
  memory card

  16-bit external           CN4        External battery           P8
  expansion card

  Primary floppy            P3         IDE interface             P11
  drive interface

  Note:Expansion card slots CN1 through CN4 will accept standard 8 or
  16-bit ISA cards.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Password check enabled                   E1            pins 1 & 2
                                                              closed

      Password check disabled                  E1            pins 2 & 3
                                                              closed

     Factory configured - do not alter        E2              Open

     Factory configured - do not alter        E3              Open

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Parity check enabled                    E1              Closed

      Parity check disabled                   E1               Open

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         NONE

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

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                       SW1           Position

     Parity check enabled                    SW1/1             On

      Parity check disabled                   SW1/1            Off

     Total system memory is less than        SW1/2            Off
      16MB

      Total system memory is 16MB or          SW1/2             On
      more

     Factory configured - do not alter       SW1/3            Off

                         DRAM SWITCH CONFIGURATION

  Total memory    SW1/4       SW1/5       SW1/6       SW1/7       SW1/8

        1MB         On          On         On          On          Off

        2MB         On          On         On          Off         On

        3MB         On          On         On          Off         Off

       4MB         On          On         Off         On          On

        5MB         On          On         Off         On          Off

        6MB         On          On         Off         Off         On

        7MB         On          On         Off         Off         Off

        8MB         On         Off         On          On          On

        9MB         On         Off         On          On          Off

        10MB        On         Off         On          Off         On

        11MB        On         Off         On          Off         Off

        12MB        On         Off         Off         On          On

        13MB        On         Off         Off         On          Off

        14MB        On         Off         Off         Off         On

        15MB        On         Off         Off         Off         Off

        16MB       Off          On         On          On          On

        17MB       Off          On         On          On          Off

        18MB       Off          On         On          Off         On

        19MB       Off          On         On          Off         Off

        20MB       Off          On         Off         On          On

  Note:Set the switches to the total amount of system memory installed
  not including this card.

  A setting of more than 4MB means that this card is the second memory
  card that is installed.

                                                                  DRAM CONFIGURATION

  Size       0       1        2        3        4        5        6        7        8       9        10       11       12      13       14       15

   0MB     None     None     None     None     None    None     None     None     None     None     None     None     None    None     None     None

   1MB     Filled   None     None     None     None    None     None     None     None     None     None     None     None    None     None     None

   2MB     Filled  Filled    None     None     None    None     None     None     None     None     None     None     None    None     None     None

   3MB     Filled  Filled   Filled    None     None    None     None     None     None     None     None     None     None    None     None     None

   4MB     Filled  Filled   Filled   Filled    None    None     None     None     None     None     None     None     None    None     None     None

   5MB     Filled  Filled   Filled   Filled   Filled   None     None     None     None     None     None     None     None    None     None     None

   6MB     Filled  Filled   Filled   Filled   Filled   Filled   None     None     None     None     None     None     None    None     None     None

   7MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   None     None     None     None     None     None    None     None     None

  Filled   Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   None     None     None     None     None    None     None     None

   9MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled   None     None     None     None    None     None     None

  10MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled    None     None     None    None     None     None

  11MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled    None     None    None     None     None

  12MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled   Filled    None    None     None     None

  13MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled   Filled   Filled   None     None     None

  14MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled   Filled   Filled   Filled   None     None

  15MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled   Filled   Filled   Filled   Filled   None

  16MB     Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled   Filled  Filled   Filled   Filled   Filled   Filled   Filled   Filled

  Note:Banks (0 through 15) are filled using (1) 256K x 36 SIMMs. This table is for a single card only.

