
UNIDENTIFIED

LX400A/G

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal) MHz
Chip Set         SiS
Max. Onboard DRAM32MB
Cache            64/128/256
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (2), PS/2 mouse port
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Flash LED connector       FLASH      Power LED & keylock         J7

  Turbo LED                   J3       PS/2 mouse connector       J11

  Turbo switch                J4       Standby output             J28
                                       connector

  Speaker                     J5       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J6       32-bit VESA Local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured do not alter         JP1              Open

     Monitor type select color               JP2             Closed

      Monitor type select monochrome          JP2              Open

     Factory configured do not alter         JP10             N/A

     Factory configured do not alter         JP11             N/A

      PS/2 mouse interrupt                    JP12          pins 1 & 2
                                                              closed

      PS/2 mouse set at AT Bus IRQ12          JP12          pins 2 & 3
                                                              closed

     Factory configured do not alter         JP13             N/A

     Factory configured do not alter         JP14             N/A

     Factory configured do not alter         JP21             N/A

     Factory configured do not alter         JP22             N/A

     Factory configured do not alter         JP23             N/A

     Power saving mode switch off           STDBY             Open

      Power saving mode switch on            STDBY            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) 4MB x 9    (4) 4MB x 9

      20MB        (4) 1MB x9     (4) 4MB x 9

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

                        CACHE 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 are in the closed position.

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64 KB       (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

    128 KB      (4) 32K x 8        NONE       (1) 8K x 8

    256 KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                          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           Closed           pins 1 & 2         pins 1 & 2
                                          closed             closed

                          CPU SPEED CONFIGURATION

    CPU speed             S0                 S1                 S2

      25 MHz            Closed              Open               Open

      33 MHz            Closed             Closed             Closed

      40 MHz            Closed             Closed             Closed

      50 MHz             Open               Open              Closed

      50iMHz            Closed              Open               Open

      60iMHz            Closed             Closed             Closed

  Note:The location on the system board of the above jumpers is
  unidentified.

                  VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU Speed        Wait states        JP24, JP26         JP25, JP27

     < 33MHz        0 wait states        pins 1 & 2         pins 1 & 2
                                          closed             closed

     > 33MHz         1 wait state        pins 2 & 3         pins 2 & 3
                                          closed             closed

                       MISCELLANEOUS TECHNICAL NOTE

  Note:Some of the SR jumpers may be hard-wired by the manufacturer, thus
  some of the cache options may not be available.

