
SOYO COMPUTER CO., LTD.

SY-24A


Processor            80386DX/80486SX/80486DX/80486DX2
Processor Speed      25/33/40/50(internal)/50/66(internal)MHz
Chip Set             CONTAQ
Max. Onboard DRAM    32MB
Cache                64/256KB
BIOS                 AMI
Dimensions           330mm x 217mm
I/O Options          None
NPU Options          80387/3167


[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

     Monitor type select monochrome           JP3             Open

      Monitor type select color                JP3            Closed

     CMOS memory normal operation             JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP5           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

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

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

      16MB        (4) 4M x 9         NONE

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

      2OMB        (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 (U28)        Dirty Bit
                                                                (U44)

     64KB       (4) 8K x 8    (4) 8K x 8     (1) 8K x 8      (1) 16K x 4

     256KB      (4) 32K x 8   (4) 32K x 8   (1) 32K x 8      (1) 16K x 4

  Note:Dirty bit need only be filled if writeback mode is selected in the
  CMOS-advanced chipset setup.

                     CACHE JUMPER CONFIGURATION

   Size     JP30      JP31     JP32      JP33      JP34      JP35

   64KB     Open      Open     Open      Open      Open     2 & 3

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

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

   Type      JP36   JP37   JP38   JP39   JP40   JP41   JP42   JP43   JP44

  80386DX    2 &    2 &    2 &    2 &    2 &    2 &    2 &    2 &     2 &
              3      3      3      3      3      3      3      3      3

  80486SX    1 &    1 &    1 &    1 &    1 &    1 &    1 &    1 &     1 &
              2      2      2      2      2      2      2      2      2

  80486DX    1 &    1 &    1 &    1 &    2 &    2 &    2 &    2 &     1 &
              2      2      2      2      3      3      3      3      2

  80486DX2   1 &    1 &    1 &    1 &    2 &    2 &    2 &    2 &     1 &
              2      2      2      2      3      3      3      3      2

  Note: Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

     Speed            OSC2            JP8           JP13         JP14

   25/50iMHz          25MHz        pins 1 & 2       Open        Closed
                                     closed

   25/50iMHz          50MHz        pins 2 & 3       Open        Closed
                                     closed

   33/66iMHz        33.33MHz       pins 1 & 2      Closed        Open
                                     closed

   33/66iMHz        66.667MHz      pins 2 & 3      Closed        Open
                                     closed

     40MHz            40MHz        pins 1 & 2       Open         Open
                                     closed

     40MHz            80MHz        pins 2 & 3       Open         Open
                                     closed

     50MHz            50MHz        pins 1 & 2      Closed       Closed
                                     closed

