
AST RESEARCH, INC.

Bravo LC 4/66D

Processor              80486SX/80486DX2 (on external CPU/Cache module)
Processor Speed        25/66I MHz (only with external CPU/Cache module)
Chip Set               AST
Max. Onboard DRAM      64MB
SRAM Cache             256KB (on external CPU/Cache module)
BIOS                   AST
Dimensions             254mm x 338mm
I/O Options            Bus mouse port, CPU/Cache upgrade module, floppy
                       drive interface, IDE interface, LAN module,
                       parallel port, serial port (2), VGA port
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  Serial port 2 (COM2)        J12       Floppy drive             J24
                                        interface

  Parallel port               J13       External speaker         J27

  Bus mouse port              J14       Fan power                J28

  LAN module               J15 & J16    Front panel              J29
                                        switches & LEDs

  Serial port 1 (COM1)        J17       Feature connector        J46

  VGA port                    J18       CPU/Cache upgrade      J50, J51,
                                        module                 J52, J53

  VGA pass-through            J19       IDE interface LED        J100

  IDE interface               J22

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not             E1                open
      alter

     Factory configured - do not             E2             pins 2 & 3
      alter                                                    closed

     Parallel port interrupt                 E5             pins 2 & 3
      select IRQ7                                              closed

      Parallel port interrupt                 E5             pins 1 & 2
      select IRQ5                                              closed

     CMOS memory normal operation            E6                open

      CMOS memory clear                       E6               closed

     VGA port enabled                   SW1/switch 1          closed

      VGA port disabled                  SW1/switch 1           open

     Password check enabled             SW1/switch 2           open

      Password check disabled            SW1/switch 2          closed

     Factory configured - do not        SW1/switch 3           open
      alter

     Factory configured - do not        SW1/switch 4           open
      alter

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

     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

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

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

    VRAM CONFIGURATION

  Size         VRAM

  512KB      (4) 44256

[Image]

PROCESSOR/CACHE MODULE

                                CONNECTIONS

  Purpose                                               Location

  CPU/Cache upgrade module                         J50, J51, J52, J53

  Note: Connections are on the back side of the module and correspond to
  the connector with the same label on the motherboard.

      CACHE CONFIGURATION

      Size        Cache SRAM

     256KB       (8) 256K x 1

                    CPU/CACHE MODULE TYPE CONFIGURATION

    Module Type      Jumper E4     Jumper E5     Jumper E7     Jumper E8

       CPU only        open         closed        closed        closed

      Cache only      closed         open          open          open

       CPU and       closed        closed         open          open
         Cache

  Note:These settings are given for information only and should not be
  changed.

                          CPU SPEED CONFIGURATION

    Internal         External      Jumper E1     Jumper E3     Jumper E6

        25MHz         25MHz          closed       closed         open

        33MHz         33MHz           open        closed         open

        50MHz         25MHz          closed       closed         open

       66MHz         33MHz           open        closed         open

  Note:These settings are given for information only and should not be
  changed.

                          CPU TYPE CONFIGURATION

      CPU Type        Jumper E2     Jumper E9    Jumper E10    Jumper E11

       80486DX2      pins 2 & 3    pins 2 & 3    pins 2 & 3     closed
                       closed        closed        closed

        ODP486SX      pins 1 & 2    pins 2 & 3    pins 1 & 2     closed
                       closed        closed        closed

        80486DX       pins 2 & 3    pins 2 & 3    pins 2 & 3     closed
                       closed        closed        closed

        80487SX       pins 1 & 2    pins 2 & 3    pins 2 & 3     closed
                       closed        closed        closed

        80486SX       pins 1 & 2    pins 2 & 3    pins 2 & 3      open
                       closed        closed        closed

          None          open          open          open          open

  Note:These settings are given for information only and should not be
  changed.

