
DASH COMPUTER, INC.

DC 486 EISA

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             OPTI
Max. Onboard DRAM    128MB
Cache                64/128/256KB
BIOS                 AMI
Dimensions           330.2mm x 218.4mm
I/O Options          None
NPU Options          4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J4       Reset switch               S9

  Power LED & keylock          J5       Turbo switch               SW

  Turbo LED                   LED

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                JP4            closed

      Monitor type select monochrome           JP4             open

     CPU speed select 25/33/50MHz             JP6             open

      CPU speed select 20MHz                   JP6            closed

     CPU speed select iOSC/1                  JP8           pins 1 & 2
                                                              closed

      CPU speed select iOSC/2                  JP8           pins 2 & 3
                                                              closed

                     EISA BUS CONTROLLER SPEED SELECT

      Speed              JP1               JP2                 JP3

      20MHz             open              closed        pins 2 & 3 closed

      25MHz             open               open         pins 1 & 2 closed

      33MHz            closed              open         pins 1 & 2 closed

      40MHz             open              closed        pins 1 & 2 closed

      50Mhz            closed             closed        pins 1 & 2 closed

                          CPU TYPE CONFIGURATION

  Jumper         80486SX               80487SX          80486DX or DX2

   JP7      pins 2 & 3 closed     pins 1 & 2 and 3 &   pins 1 & 2 and 3 &
                                      4 closed             4 closed

   JP9             open           pins 1 & 2 closed    pins 2 & 3 closed

             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

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

  64MB      (4) 16M x 9           NONE

  68MB       (4) 1M x 9       (4) 16M x 9

  80MB       (4) 4M x 9       (4) 16M x 9

  128MB     (4) 16M x 9       (4) 16M x 9

                        CACHE JUMPER CONFIGURATION

      Jumper             64KB              128KB              256KB

       JP5            pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       JP10              open              open               open

       JP11              open              open              closed

       JP12              open             closed             closed

       JP13              open              open              closed

       JP14              open             closed             closed

       JP15              open              open               open

                            CACHE CONFIGURATION

  Size     Cache     Location      TAG        TAG       TAG       Dirty
                                  (U49)     (U50)      (U51)       bit
                                                                  (U64)

  64KB     (8) 8K    Banks 0 &    (1) 4K    (1) 8K     NONE      (1) 64K
            x 8         1          x 1       x 8                   x 1

  128KB    (4) 32K    Bank 0     (1) 64K    (1) 8K     NONE      (1) 64K
            x 8                    x 1       x 8                   x 1

  256KB    (8) 32K   Banks 0 &   (1) 64K    (1) 8K     (1) 8K    (1) 64K
            x 8         1          x 1       x 8        x 8        x 1

