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