AST RESEARCH, INC.

Bravo LC 4/33

Processor              80486SX/80486DX(on external CPU/Cache module)
Processor Speed        25/33MHz(only with external CPU/Cache module)
Chip Set               AST
Max. Onboard DRAM      64MB
SRAM Cache             None
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]

                                CONNECTIONS

  Purpose                                               Location

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

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

                    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.