
BCM ADVANCED RESEARCH, INC.

LX400A/P VLB

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   20/25/33/50(internal)/50/66(internal)
Chip Set          SIS
Max. Onboard DRAM 32MB
SRAM Cache        64/128/256KB
BIOS              AMI
Dimensions        254mm x 218mm
I/O Options       32-bit VESA local bus slot (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  Turbo LED                  J3        Power LED & keylock         J7

  Turbo switch               J4        32-bit VESA local bus       S1
                                       slot

  Speaker                    J5        32-bit VESA local bus       S2
                                       slot

  Reset switch               J6

                 32-BIT VESA LOCAL BUS SLOT CONFIGURATION

   CPU Speed        JP24           JP25          JP26           JP27

    <=33MHz      pins 1 & 2     pins 1 & 2     pins 1 & 2     pins 1 & 2
                   closed         closed        closed         closed

    > 33MHz      pins 2 & 3     pins 2 & 3     pins 2 & 3     pins 2 & 3
                   closed         closed        closed         closed

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not            JP1                open
      alter

     Monitor type select color              JP2               closed

      Monitor type select                    JP2                open
      monochrome

     Power good signal detect from          JP14            pins 1 & 2
      power supply                                             closed

      Power good signal detect from          JP14            pins 2 & 3
      board                                                    closed

                    SRAM CONFIGURATION

     Size          Cache         Location         TAG

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (2) 32K x 8

                         SRAM JUMPER CONFIGURATION

    Size         SR1          SR2         SR3         SR4         SR5

    64KB       pins 2 &     pins 2 &    pins 1 &    pins 1 &   pins 1 & 2
                  3            3           2           2

    128KB      pins 1 &     pins 1 &    pins 2 &    pins 2 &   pins 1 & 2
                  2            2           3           3

    256KB      pins 2 &     pins 2 &    pins 2 &    pins 2 &   pins 2 & 3
                  3            3           3           3

  Note:Pins designated should be in the closed position.

                            CPU SPEED SELECTION

        Speed             JP10         JP11          JP12         JP13

        20MHz           pins 2 & 3   pins 2 & 3   pins 2 & 3   pins 2 & 3

  25MHz/50(internal)    pins 2 & 3   pins 2 & 3   pins 1 & 2   pins 1 & 2

  33MHz/66(internal)    pins 1 & 2   pins 2 & 3   pins 1 & 2   pins 1 & 2

        50MHz           pins 1 & 2   pins 1 & 2   pins 1 & 2   pins 1 & 2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      CPU type              JP6              JP7                JP8

       80486SX             open              open            pins 2 & 3
                                                              closed

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

     80486DX/DX2          closed          pins 1 & 2         pins 1 & 2
                                            closed            closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

