
AST RESEARCH, INC.

ADVANTAGE! 8000 SERIES 486 (COBRA)

(202695-1X1)

Processor     80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/Pentium
              Overdrive
Processor     25/33/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set      Unidentified
Max. Onboard  128MB
DRAM
Cache         64/256KB
BIOS          Unidentified
Dimensions    330mm x 218mm
I/O Options   Floppy drive interface, IDE interface, parallel port, PS/2
              mouse port, serial ports (2), 8514 video pass through, VGA
              port, riser slot
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  PS/2 mouse port           CN2        External battery          J26

  Serial port               CN3        Speaker                   J27

  Serial port               CN4        Chassis fan power         J28

  Parallel port             CN5        Front console LED         J29

  VGA port                  CN6        Chassis fan power         J32

  8514 video pass           J19        IDE interface LED         J40
  through connector

  IDE interface             J22        Riser slot                SL1

  Floppy drive              J24
  interface

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     Factory configured - do not            E6              pins 1 & 2
      alter                                                   closed

     CMOS memory normal operation           E8                Open

      CMOS memory clear                      E8               Closed

     Video memory enabled                  E800              Closed

     Flash BIOS normal operation           SW1/1               Off

      Flash BIOS force update at            SW1/1               On
      boot

     Password enabled                      SW1/2               On

      Password disabled                     SW1/2               Off

     Monitor type select color             SW1/3               On

      Monitor type select                   SW1/3               Off
      monochrome

     Setup access enabled                  SW1/4               Off

      Setup access disabled                 SW1/4               On

     On board video enabled                SW1/5               On

      On board video disabled               SW1/5               Off

     Factory configured - do not           SW1/6               On
      alter

     Factory configured - do not           SW1/7               On
      alter

     Factory configured - do not           SW1/8               On
      alter

                            DRAM CONFIGURATION

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     4MB        (1) 1M x 32      NONE           NONE            NONE

     8MB        (1) 2M x 32      NONE           NONE            NONE

     8MB        (1) 1M x 32   (1) 1M x 32       NONE            NONE

     9MB        (1) 1M x 32   (1) 1M x 32     (1) 256K x        NONE
                                                 32

     10MB       (1) 1M x 32   (1) 1M x 32     (1) 256K x    (1) 256K x 32
                                                 32

     12MB       (1) 1M x 32   (1) 1M x 32    (1) 1M x 32        NONE

     16MB       (1) 1M x 32   (1) 1M x 32    (1) 1M x 32     (1) 1M x 32

     16MB       (1) 4M x 32      NONE           NONE            NONE

     17MB       (1) 2M x 32   (1) 2M x 32     (1) 256K x        NONE
                                                 32

     18MB       (1) 2M x 32   (1) 2M x 32     (1) 256K x    (1) 256K x 32
                                                 32

     20MB       (1) 2M x 32   (1) 2M x 32    (1) 1M x 32        NONE

     24MB       (1) 2M x 32   (1) 2M x 32    (1) 1M x 32     (1) 1M x 32

     24MB       (1) 2M x 32   (1) 2M x 32    (1) 2M x 32        NONE

     32MB       (1) 2M x 32   (1) 2M x 32    (1) 2M x 32     (1) 2M x 32

     32MB       (1) 8M x 32      NONE           NONE            NONE

     32MB       (1) 4M x 32   (1) 4M x 32       NONE            NONE

     33MB       (1) 4M x 32   (1) 4M x 32     (1) 256K x        NONE
                                                 32

     34MB       (1) 4M x 32   (1) 4M x 32     (1) 256K x    (1) 256K x 32
                                                 32

     36MB       (1) 4M x 32   (1) 4M x 32    (1) 1M x 32        NONE

     40MB       (1) 4M x 32   (1) 4M x 32    (1) 1M x 32     (1) 1M x 32

     40MB       (1) 4M x 32   (1) 4M x 32    (1) 2M x 32        NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1        Bank 2          Bank 3

     48MB        (1) 4M x 32   (1) 4M x 32   (1) 2M x 32     (1) 2M x 32

     48MB        (1) 4M x 32   (1) 4M x 32   (1) 4M x 32        NONE

     64MB        (1) 4M x 32   (1) 4M x 32   (1) 4M x 32     (1) 4M x 32

     64MB        (1) 8M x 32   (1) 8M x 32      NONE            NONE

     66MB        (1) 8M x 32   (1) 8M x 32    (1) 256K x    (1) 256K x 32
                                                 32

     68MB        (1) 8M x 32   (1) 8M x 32   (1) 1M x 32        NONE

     72MB        (1) 8M x 32   (1) 8M x 32   (1) 1M x 32     (1) 1M x 32

     72MB        (1) 8M x 32   (1) 8M x 32   (1) 2M x 32        NONE

     80MB        (1) 8M x 32   (1) 8M x 32   (1) 2M x 32     (1) 2M x 32

     80MB        (1) 8M x 32   (1) 8M x 32   (1) 4M x 32        NONE

     96MB        (1) 8M x 32   (1) 8M x 32   (1) 4M x 32     (1) 4M x 32

     96MB        (1) 8M x 32   (1) 8M x 32   (1) 8M x 32        NONE

     128MB       (1) 8M x 32   (1) 8M x 32   (1) 8M x 32     (1) 8M x 32

                           CACHE CONFIGURATION

  Note: The location and chips sizes of 64/256KB cache is unidentified.

  CACHE JUMPER CONFIGURATION

     Size             E5

     64KB            Open

     256KB          Closed

                          CPU TYPE CONFIGURATION

       Type            E1           E2             E3             E10

  80486SX (PQFP)      Open       pins 2 & 3     pins 1 & 2      Closed
                                  closed         closed

     ODP486SX         Open       pins 2 & 3     pins 1 & 2      Closed
                                  closed         closed

     80486DX          Open       pins 1 & 2     pins 1 & 2      Closed
                                  closed         closed

     80486DX2         Open       pins 1 & 2     pins 1 & 2      Closed
                                  closed         closed

  80486DX2 (WB)       Open       pins 1 & 2     pins 2 & 3       Open
                                  closed         closed

     80486DX4         Open       pins 1 & 2     pins 1 & 2      Closed
                                  closed         closed

      Pentium         Open       pins 2 & 3     pins 2 & 3       Open
    Overdrive                     closed         closed

  Note: E10 is not on all boards.

                   CPU SPEED CONFIGURATION

        Speed                 E7                   E9

        25MHz          pins 1 & 2 closed         Closed

        33MHz          pins 2 & 3 closed          Open

       50iMHz          pins 1 & 2 closed         Closed

       66iMHz          pins 2 & 3 closed          Open

       100iMHz         pins 1 & 2 closed         Closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

       Voltage                  E4

          2x            pins 2 & 3 closed

         2.5x           pins 1 & 2 closed

          3x                   Open

                         CPU VOLTAGE CONFIGURATION

   Voltage      E11       E12      E13      E14        E15         E16

  3v Cyrix     2 & 3     2 & 3    2 & 3    2 & 3       Open       1 & 2

  3v Intel     1 & 2     1 & 2    1 & 2    1 & 2      Closed      2 & 3

  5v Cyrix     2 & 3     2 & 3    2 & 3    2 & 3       Open        Open

  5v Intel     1 & 2     1 & 2    1 & 2    1 & 2      Closed       Open

  Note: Pins designated should be in the closed position. The location of
  E12 is unidentified.

               VIDEO MEMORY CONFIGURATION

  1024KB is factory installed and is not configurable.

