
UNIDENTIFIED

486SI4 (M-81)

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             C & T
Max. Onboard DRAM    32MB
SRAM Cache           128/256KB
BIOS                 AMI
Dimensions           254mm x 218mm
I/O Options          32-bit local bus card slot
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 local bus card       S1

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Local bus data size select               J8            pins 1 & 2
      32-bits                                                 closed

      Local bus data size select               J8            pins 2 & 3
      16-bits                                                 closed

     Factory configured - do not alter        JP1             open

     Monitor type select color                JP2            closed

      Monitor type select monochrome           JP2             open

     Factory configured - do not alter        JP3           pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP4           pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP5            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

              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

                  SRAM JUMPER CONFIGURATION

       Jumper               128KB                256KB

         SR1           pins 2 & 3 closed   pins 2 & 3 closed

         SR2           pins 2 & 3 closed   pins 2 & 3 closed

         SR3           pins 2 & 3 closed   pins 2 & 3 closed

         SR4           pins 1 & 2 closed   pins 2 & 3 closed

         SR5           pins 1 & 2 closed   pins 2 & 3 closed

         SR6           pins 2 & 3 closed   pins 2 & 3 closed

         SR7           pins 2 & 3 closed   pins 2 & 3 closed

         SR8           pins 1 & 2 closed   pins 2 & 3 closed

         SR9           pins 1 & 2 closed   pins 2 & 3 closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      Location         TAG

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

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

