
SOYO COMPUTER CO., LTD.

80486 DX/SX CACHE

Processor           80486SX/80487SX/80486DX/80486DX2
Processor Speed     25/33/50(internal)/50/66(internal)MHz
Chip Set            ETEQ
Max. Onboard DRAM   32MB
Cache               64/256KB
BIOS                AMI
Dimensions          220mm x 218mm
I/O Options         None
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J17      External battery            J20

  Speaker                     J18      Turbo switch                J21

  Reset switch                J19      Turbo LED                   J22

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not alter        J4              Open

     Factory configured - do not alter        J12           pins 1 & 2
                                                              closed

     Factory configured - do not alter        J13           pins 2 & 3
                                                              closed

     Factory configured - do not alter        J23           pins 2 & 3
                                                              closed

     Monitor type select color                JP3            Closed

      Monitor type select monochrome           JP3             Open

     CMOS memory normal operation             JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP5           pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP6           pins 1 & 2
                                                              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

      5MB         (4) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 256K x 9    (4) 4M x 9

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

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

            CACHE CONFIGURATION

     Size          Bank 0          TAG

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

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

                   CACHE JUMPER CONFIGURATION

   Size        J5         J6         J7         J8         J9

   64KB       1 & 2      1 & 2      Open       Open       Open

   256KB      2 & 3      2 & 3     Closed     Closed     Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type           J10            J11           J15            J16

    80486SX -     pins 1 & 2       Open        pins 2 & 3     pins 2 & 3
     25MHz          closed                       closed         closed

    80487SX -     pins 1 & 2     pins 2 & 3    pins 2 & 3     pins 1 & 2
     25MHz          closed        closed         closed         closed

    80487SX -     pins 1 & 2     pins 2 & 3    pins 2 & 3     pins 1 & 2
     33MHz          closed        closed         closed         closed

    80486DX -     pins 1 & 2     pins 1 & 2    pins 2 & 3     pins 1 & 2
     33MHz          closed        closed         closed         closed

    80486DX -     pins 1 & 2     pins 1 & 2    pins 1 & 2     pins 1 & 2
     50MHz          closed        closed         closed         closed

   80486DX2 -     pins 2 & 3     pins 1 & 2    pins 1 & 2     pins 1 & 2
     50MHz          closed        closed         closed         closed

   80486DX2 -     pins 2 & 3     pins 1 & 2    pins 1 & 2     pins 1 & 2
     66MHz          closed        closed         closed         closed

  Note:Oscillator at Y1 must match the external speed of the CPU
  installed.

