
SQUARE ONE INDUSTRIES, INC.

S1-486

Processor            80486SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             OPTI
Max. Onboard DRAM    32MB
Cache                64/256KB
BIOS                 AMI
Dimensions           330mm x 218mm
I/O Options          32-bit external memory card slot
NPU Options          4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  32-bit external memory      CN1       Turbo LED                 JP12
  card

  External battery            J10       Reset switch              SW1

  Power LED & keylock         J23       Turbo switch              SW2

  Speaker                     J24

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                JP1            Closed

      Monitor type select monochrome           JP1             Open

     CMOS memory normal operation             JP2           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP2           pins 1 & 2
                                                              closed

     Bus speed select CLK2/6                  JP3            Closed

      Bus speed select CLK2/4                  JP3             Open

     CPU oscillator select single             JP4           pins 1 & 2
      phase                                                   closed

      CPU oscillator select double             JP4           pins 2 & 3
      phase                                                   closed

     Factory configured - do not alter       JP10             Open

     Factory configured - do not alter       JP13             Open

     Factory configured - do not alter       JP14             Open

  Note:Jumper JP3 may not be present on all board revisions.

           DRAM CONFIGURATION

     Size        Bank 0        Bank 1

     4MB        (4) 1M x 9      NONE

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

     16MB       (4) 4M x 9      NONE

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

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

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

          CACHE CONFIGURATION

       Size               Bank 0

       64KB             (8) 8K x 8

       256KB           (8) 32K x 8

  Note:TAG is not user configurable.

       CACHE JUMPER CONFIGURATION

   Size      JP8       JP9      JP11

   64KB      Open     Open      Open

  256KB     Closed   Closed    Closed

                          CPU TYPE CONFIGURATION

       Type                JP5               JP6                JP7

      80486SX             Open            pins 2 & 3           Open
                                            closed

      80486DX           pins 2 & 3        pins 1 & 2          Closed
                         closed             closed

     80486DX2           pins 2 & 3        pins 1 & 2          Closed
                         closed             closed

