
AST RESEARCH, INC.

POWER PREMIUM 486SX/25 (MODEL 202441-001)

Processor                  80486SX/80487SX (on external CPU/Memory module)
Processor Speed            25MHz
Chip Set                   AST
Max. Onboard DRAM          None (16MB on external CPU/Memory module)
Cache                      None
BIOS                       AST
Dimensions                 344mm x 250mm
I/O Options                32-bit external CPU/Memory module slot

                           32-bit external Memory module slot (2)

                           bus mouse port, floppy drive interface

                           IDE interface, parallel port, serial port (2),
                           SVGA port
NPU Options                4167 (on external CPU/Memory module)

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  SVGA port                    CN1      Third floppy drive         J25
                                        interface

  Bus mouse port               CN2      External battery           J26

  Serial port 1 (COM1)         CN3      Speaker                    J27

  Serial port 2 (COM2)         CN4      Fan power                  J28

  Parallel port                J13      Front panel switches       J29
                                        & LEDs

  VGA pass-through             J19      IDE interface LED          J40

  IDE interface                J22      32-bit external            S1
                                        CPU/Memory module

  Floppy drive interface       J24      32-bit external          S2 & S3
                                        Memory module slots

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     CMOS memory normal operation      SW1/switch 1            open

      CMOS memory clear                 SW1/switch 1           closed

     Password check enabled            SW1/switch 2            open

      Password check disabled           SW1/switch 2           closed

     Flash BIOS write disabled         SW1/switch 3            open

      Flash BIOS write enabled          SW1/switch 3           closed

     VGA port enabled                  SW1/switch 4           closed

      VGA port disabled                 SW1/switch 4            open

     Factory configured - do not            E1                closed
      alter

     Factory configured - do not            E2              pins 1 & 2
      alter                                                    closed

     Factory configured - do not            E3                closed
      alter

     Factory configured - do not            E4                 open
      alter

     Factory configured - do not            E5                 open
      alter

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Parity check enabled                     E1             closed

      Parity check disabled                    E1              open

     Factory configured - do not alter        E2             closed

  Note:AST CPU/Memory module part number is 202439-002.

                            DRAM CONFIGURATION

          Size                    Bank 0                   Bank 1

           2MB                  (2) 1M x 9                  NONE

           4MB                  (2) 1M x 9               (2) 1M x 9

           8MB                  (2) 4M x 9                  NONE

          10MB                  (2) 1M x 9               (2) 4M x 9

          16MB                  (2) 4M x 9               (2) 4M x 9

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

