
AST RESEARCH, INC.

BRAVO LC 4/100T

Processor   80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T
Processor   25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set    Unidentified
Video Chip  Cirrus Logic
Set
Maximum     64MB
Onboard
Memory
Maximum     1MB
Video
Memory
Cache       64/256KB
BIOS        Unidentified
Dimensions  355mm x 304mm
I/O Options 32-bit VESA local bus slot, floppy drive interface, IDE
            interface, parallel port, PS/2 mouse port, serial ports (2),
            8514 video pass through connector, VGA port
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  PS/2 mouse port           CN1        IDE interface             J22

  Serial port               CN2        Floppy drive              J24
                                       interface

  Serial port               CN3        Speaker                   J27

  Parallel port             CN4        Chassis fan power         J28

  VGA port                  CN5        Front panel LEDs          J29

  8514 video pass           J19        32-bit VESA local         SL1
  through connector                    bus slot

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Parallel port IRQ select IRQ7            E2           Pins 1 & 2
                                                              closed

      Parallel port IRQ select IRQ5            E2           Pins 2 & 3
                                                              closed

     On board video enabled                   E7             Closed

      On board video disabled                  E7              Open

     Monitor type select color                E8             Closed

      Monitor type select monochrome           E8              Open

     Factory configured - do not alter        E9             Closed

     Password normal operation               E10             Closed

      Password clear                          E10              Open

     Factory configured - do not alter       E11              Open

     Factory configured - do not alter       E16              Open

                            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

                        DRAM CONFIGURATION (CON'T)

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     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      E12        E14

   64KB      Open      Open

  256KB     Closed    Closed

                         CACHE TYPE CONFIGURATION

       Type                E1                 E6                E20

   Write through        Pins 1 & 2        Pins 1 & 2           Open
                         closed             closed

    Write back          Pins 2 & 3        Pins 2 & 3          Closed
                         closed             closed

  Note: E20 may not be present on all boards.

              VIDEO MEMORY CONFIGURATION (1994 CONFIGURATION)

          Size                    Bank 0                   Bank 1

          512KB                (4) 256K x 4                 None

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

  Note: Bank 0 is factory installed and is not configurable. On some
  revisions, Bank 1 may be factory installed. Board shown uses this
  configuration.

              VIDEO MEMORY CONFIGURATION (1995 CONFIGURATION)

          Size                    Bank 0                   Bank 1

          512KB               (1) 256K x 16                 None

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

  Note: Bank 0 is factory installed and is not configurable. On some
  revisions, Bank 1 may be factory installed. If board is a 1995
  configuration, install the upgrade chip in socket U802.

  CPU SPEED SELECTION

   Speed        E15

   25MHz       Closed

   33MHz        Open

   50iMHz      Closed

   66iMHz       Open

   75iMHz      Closed

  100iMHz       Open

                            CPU TYPE SELECTION

      Type             E3             E4            E5            E13

  80486SX (PQFP)    Pins 2 & 3    Pins 2 & 3     Pins 2 & 3      Open
                     closed         closed        closed

  80486SX (PGA)     Pins 1 & 2    Pins 1 & 2     Pins 1 & 2     Closed
                     closed         closed        closed

    SL80486DX       Pins 2 & 3    Pins 2 & 3     Pins 2 & 3     Closed
                     closed         closed        closed

   SL80486DX2       Pins 2 & 3    Pins 2 & 3     Pins 2 & 3     Closed
                     closed         closed        closed

   SL80486DX4       Pins 2 & 3    Pins 2 & 3     Pins 2 & 3     Closed
                     closed         closed        closed

      P24T          Pins 2 & 3    Pins 1 & 2     Pins 2 & 3     Closed
                     closed         closed        closed

                            CPU TYPE SELECTION

      Type               E17                E18                E19

      Cyrix           Pins 2 & 3         Pins 2 & 3         Pins 2 & 3
                       closed             closed              closed

      Intel           Pins 1 & 2         Pins 1 & 2         Pins 1 & 2
                       closed             closed              closed

  Note: These jumpers may not be present on all boards. If they are not,
  board only supports processor that was shipped from the factory.

