
UNIDENTIFIED

ISA-S486

Processor         80486SX/80486DX
Processor Speed   16/20/25/33/50MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128/256/1024KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         JP5      Speaker                    JP16

  Turbo switch               JP10      External battery           JP17

  Turbo LED                  JP11      Reset switch               JP19

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP6             Closed

      Monitor type select monochrome          JP6              Open

              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

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

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

      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          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

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 128K x 8

                 CACHE JUMPER CONFIGURATION

   Size      JP22      JP23       JP24      JP25      JP34

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

  128KB      1 & 2     1 & 2     1 & 2     1 & 2     1 & 2

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

   1MB       2 & 3     2 & 3     2 & 3     2 & 3     2 & 3

  Note: Pins designated should be in the closed position.

                        CACHE JUMPER CONFIGURATION

         Size                    JP100                     JP101

         64KB            2 & 4, 6 & 8, 10 & 12,    2 & 4, 6 & 8, 10 & 12,
                                14 & 16                   14 & 16

         128KB            1 & 3, 5 & 7, 9 & 11,    1 & 3, 5 & 7, 9 & 11,
                                13 & 15                   13 & 15

         256KB           2 & 4, 6 & 8, 10 & 12,    2 & 4, 6 & 8, 10 & 12,
                                14 & 16                   14 & 16

          1MB            2 & 4, 6 & 8, 10 & 12,    2 & 4, 6 & 8, 10 & 12,
                                14 & 16                   14 & 16

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

     CPU Type             JP12              JP13               JP14

      80486SX             Open           pins 2 & 3            Open
                                           closed

      80486DX            Closed          pins 1 & 2           Closed
                                           closed

