
DASH COMPUTER, INC.

DC 386 WB WRITE BACK-CACHE

Processor         80386DX
Processor Speed   25/33/40MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             32/64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       80387

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  Power LED & keylock         J23       Reset switch              SW1

  Speaker                     J24       Turbo switch              SW2

  32-bit external             S1        Turbo LED                 SW3
  memeory card

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome           JP1             open

      Monitor type select color                JP1            closed

     CMOS memory normal operation             JP2           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP2           pins 1 & 2
                                                              closed

     Bus speed select ATCLK/6                 JP3           pins 1 & 2
                                                              closed

      Bus speed select ATCLK/8                 JP3             open

  Note:Pins 3 and 4 on JP3 are not used

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

      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

                        CACHE JUMPER CONFIGURATION

   Size       JP5       JP6       JP7        JP8        JP9        JP10

   32KB      pins 1    pins 1    pins 1      open      pins 2    pins 2 &
              & 2       & 2       & 2                   & 3         3

   64KB      pins 2    pins 1    pins 1      open      pins 2    pins 1 &
              & 3       & 2       & 2                   & 3         2

   128KB     pins 2    pins 1    pins 2     closed     pins 2    pins 1 &
              & 3       & 2       & 3                   & 3         2

   256KB     pins 2    pins 2    pins 2     closed     pins 1    pins 1 &
              & 3       & 3       & 3                   & 2         2

  Note:Pins designated should be in the closed position

                            CACHE CONFIGURATION

     Size       Cache SRAM      Location       TAG (U32 &     Dirty Bit
                                                 U33)           (U42)

     32KB       (4) 8K x 8       Bank 0       (2) 4K x 4     (1) 4K x 4

     64KB       (8) 8K x 8    Banks 0 & 1     (2) 4K x 4     (1) 4K x 4

    128KB       (4) 32K x 8      Bank 0       (2) 16K x 4    (1) 16K x 1

    256KB       (8) 32K x 8   Banks 0 & 1     (2) 16K x 4    (1) 16K x 1

