
UNIDENTIFIED

LX400/P VESA LOCAL BUS

Processor          80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed    20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set           SIS
Max. Onboard DRAM  32MB
SRAM Cache         64/128/256KB
BIOS               AMI
Dimensions         254mm x 218mm
I/O Options        32-bit VESA card slot (2)
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Turbo LED                   J3       Reset switch                J6

  Turbo switch                J4       Power LED & keylock         J7

  Speaker                     J5       32-bit VESA card (2)      S1 & S2

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Factory configured - do not alter        JP1            closed

     Monitor type select color                JP2            closed

      Monitor type select monochrome           JP2             open

     Factory configured - do not alter        JP9            unknown

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

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

     Factory configured - do not alter        JP15           unknown

     Factory configured - do not alter        JP16           unknown

     Factory configured - do not alter        JP24           unknown

     Factory configured - do not alter        JP25           unknown

     VESA bus wait states select 0            JP26            open

      VESA bus wait state select 1             JP26            open

     CPU speed select  33MHz                 JP27           closed

      CPU speed select > 33MHz                 JP27           closed

  Note: The locations of JP1 and JP16 are unknown.

              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) 4M x 9      (4) 1M x 9

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

                          CPU SPEED CONFIGURATION

      Speed            JP10          JP11          JP12          JP13

       66MHz        pins 1 & 2    pins 2 & 3    pins 1 & 2     pins 1 & 2
    (internal)        closed        closed        closed        closed

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

       50MHz        pins 2 & 3    pins 2 & 3    pins 1 & 2     pins 1 & 2
    (internal)        closed        closed        closed        closed

      33MHz         pins 1 & 2    pins 2 & 3    pins 1 & 2     pins 1 & 2
                      closed        closed        closed        closed

      25MHz         pins 2 & 3    pins 2 & 3    pins 1 & 2     pins 1 & 2
                      closed        closed        closed        closed

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

                         CPU JUMPER CONFIGURATION

        CPU               JP6               JP7                JP8

      80486DX           closed           pins 1 & 2         pins 1 & 2
                                          closed             closed

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

      80486SX            open              open             pins 2 & 3
                                                             closed

                         SRAM JUMPER CONFIGURATION

      Jumper             64KB              128KB              256KB

       SR1            pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR2            pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR3            pins 1 & 2         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR4            pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR5            pins 1 & 2         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR6            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      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    (1) 32K x 8

