
AST RESEARCH, INC.

BRAVO MT (202528-XXX)

Processor     80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor     25/33/50(internal)/66(internal)MHz
Speed
Chip Set      AST
Max. Onboard  64MB
DRAM
Cache         64/256KB
BIOS          AST
Dimensions    330mm x 218mm
I/O Options   Floppy drive interface, IDE interface, parallel port, PS/2
              mouse port, serial ports (2), VGA feature connector, VGA
              port
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         E1       VGA port                   J18

  Reset switch                E3       VGA feature connector      J19

  IDE interface LED           E4       IDE interface              J22

  PS/2 mouse port            J12       Floppy drive               J24
                                       interface

  Parallel port              J13       Chassis fan power          J28

  Serial ports (2)         J10 & J44

  Note: Serial port J44 is located under J10.

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     CMOS memory normal operation           E5                Open

      CMOS memory clear                      E5               Closed

     Factory configured - do not            E14             pins 1 & 2
      alter                                                   closed

     Parallel port IRQ select               E15             pins 1 & 2
      IRQ7                                                    closed

      Parallel port IRQ select               E15             pins 2 & 3
      IRQ5                                                    closed

     Factory configured - do not           E800             pins 1 & 2
      alter                                                   closed

     Factory configured - do not           E801             pins 2 & 3
      alter                                                   closed

     Power management enabled              E802             pins 1 & 2
                                                              closed

      Power management disabled             E802             pins 2 & 3
                                                              closed

     Factory configured - do not           E803             pins 1 & 2
      alter                                                   closed

     Factory configured - do not           E804             pins 1 & 2
      alter                                                   closed

     On board video enabled                SW1/1               Off

      On board video disabled               SW1/1               On

     POST type select normal               SW1/2               Off

      POST type select test loop            SW1/2               On

     Boot type select normal               SW1/3               Off

      Boot type select flash BIOS           SW1/3               On
      update

     Password enabled                      SW1/4               Off

      Password disabled                     SW1/4               On

     Monitor type select color             SW1/5               On

      Monitor type select                   SW1/5               Off
      monochrome

     Factory configured - do not           SW1/6               Off
      alter

     Factory configured - do not           SW1/7               Off
      alter

     System setup type select              SW1/8               Off
      allow access

      System setup type select              SW1/8               On
      deny access

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        NONE           NONE           NONE
                    36

     2MB        (1) 256K x     (1) 256K x        NONE           NONE
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        NONE
                    36             36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

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

     5MB       (1) 1M x 36     (1) 256K x        NONE           NONE
                                   36

     6MB       (1) 1M x 36     (1) 256K x     (1) 256K x        NONE
                                   36             36

     7MB       (1) 1M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     8MB       (1) 1M x 36    (1) 1M x 36        NONE           NONE

     9MB       (1) 1M x 36    (1) 1M x 36     (1) 256K x        NONE
                                                  36

     10MB      (1) 1M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     13MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     16MB      (1) 4M x 36        NONE           NONE           NONE

     17MB      (1) 4M x 36     (1) 256K x        NONE           NONE
                                   36

     18MB      (1) 4M x 36     (1) 256K x     (1) 256K x        NONE
                                   36             36

     19MB      (1) 4M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     20MB      (1) 4M x 36    (1) 1M x 36        NONE           NONE

     21MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x        NONE
                                                  36

     22MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

     24MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     25MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     28MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

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

     33MB      (1) 4M x 36    (1) 4M x 36     (1) 256K x        NONE
                                                  36

     34MB      (1) 4M x 36    (1) 4M x 36     (1) 256K x    (1) 256K x 36
                                                  36

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

     37MB      (1) 4M x 36    (1) 4M x 36    (1) 1M x 36    (1) 256K x 36

     40MB      (1) 4M x 36    (1) 4M x 36    (1) 1M x 36     (1) 1M x 36

     48MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36        NONE

     49MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 256K x 36

     52MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36     (1) 1M x 36

     64MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     64KB        (8) 8K x 8    (1) 8K x 8

     256KB       (8) 32K x 8   (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size                E6                 E7                 E8

      64KB            pins 1 & 2            Open               Open
                        closed

      256KB           pins 2 & 3           Closed             Closed
                        closed

  Note: Some later versions have omitted jumper E6.

                         CPU UPGRADE CONFIGURATION

       Type             E9          E10       E11       E12        E13

       None             N/A         N/A       N/A       N/A       2 & 3

      80486SX          Open        2 & 3     2 & 3     2 & 3      1 & 2

      80487SX         Closed       1 & 2     1 & 2     2 & 3      1 & 2

    80486DX/DX2       Closed       2 & 3     1 & 2     2 & 3      2 & 3

  Overdrive (ODPR)    Closed       2 & 3     1 & 2     2 & 3      1 & 2

  Overdrive (ODP)     Closed       1 & 2     1 & 2     2 & 3      2 & 3

  Overdrive (P24T)    Closed       1 & 2     1 & 2     1 & 2      2 & 3

  Note: Pins designated should be in the closed position.

  CPU SPEED CONFIGURATION

    Speed          E16

    25MHz          Open

    33MHz         Closed

    50iMHz         Open

    66iMHz        Closed

                    VIDEO MEMORY CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

      512KB       (1) 256K x 16         NONE            NONE

       1MB        (1) 256K x 16    (1) 256K x 16        NONE

       2MB        (1) 256K x 16    (1) 256K x 16    (2) 256K x 16

  Note: Bank 0 is factory installed and is not configurable.

