
FIRST INTERNATIONAL COMPUTER, INC.

486-20/25/33/50SC (REV. A)

Processor         80486SX/80486DX
Processor Speed   20/25/33/50MHz
Chip Set          Symphony
Max. Onboard DRAM 32MB
Cache             64/128/256/1024KB
BIOS              AMI
Dimensions        330.2mm x 218.4mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Turbo switch               JP12      Speaker                    JP18

  Turbo LED                  JP14      Power LED & keylock        JP19

  Reset switch               JP17

                        USER CONFIGURABLE SETTINGS

             Function                  Jumper/Switch          Position

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

     CPU speed select iOSC/2              JP5/6                Off

      CPU speed select iOSC/1              JP5/6                 On

     Monitor type select                  JP5/8                Off
      monochrome

      Monitor type select color            JP5/8                 On

     Factory configured - do not           JP20             pins 1 & 2
      alter                                                    closed

     Factory configured - do not           JP21             pins 1 & 2
      alter                                                    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) 1M x 9     (4) 256K x 9

      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

                            CACHE CONFIGURATION

   Size          Bank 0                Bank 1                 TAG

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

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

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

  1024KB      (4) 128K x 8          (4) 128K x 8         (1) 128K x 8

                        CACHE JUMPER CONFIGURATION

  Size     JP3  JP6   JP7    JP8   JP9   JP10   JP11   JP13   JP15  JP16

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

  128KB    1 &  1 &   Open   1 &   1 &   1 &    2 &    open   1 &   1 & 2
           2     2            2     2     2      3             2

  256KB    1 &  2 &    2 &   2 &   1 &   2 &    2 &    2 &    2 &   2 & 3
           2     3     3      3     2     3      3      3      3

  1024KB   2 &  2 &    2 &   2 &   2 &   2 &    2 &    2 &    2 &   2 & 3
           3     3     3      3     3     3      3      3      3

  Note:Pins designated should be in the closed position.

                   CACHE SWITCH CONFIGURATION

   Size       JP5/3        JP5/4         JP5/5        JP5/7

   64KB        Off          Off           Off           On

  128KB        On            On           On           Off

  256KB        Off          Off           Off           On

  1024KB       Off          Off           Off           On

                          CPU TYPE CONFIGURATION

       Type                JP2               JP5/1             JP5/2

      80486SX           pins 2 & 3            Off               Off
                          closed

      80486DX           pins 1 & 2            On                On
                          closed

