AMERICAN DIGITAL DATA ASSOCIATES

Precision 486-25

Processor              80486DX
Processor Speed        25MHz
Chip Set               OPTI
Max. Onboard DRAM      32MB
Cache                  64/128KB (on 32-bit external cache card)
BIOS                   AMI
Dimensions             330mm x 218mm
I/O Options            32-bit external memory card slot, 32-bit external
                       cache card slot
NPU Options            4167

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            BAT       Speaker                   J25

  32-bit external             CN1       Power LED & keylock       J26
  memory card

  32-bit external cache       CN2       Reset switch              SW1
  card

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color                JP1            Closed

      Monitor type select monochrome           JP1             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) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

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

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

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

     CACHE CARD CONFIGURATION

  Setting       JP3        JP4

  Disabled    Closed      Closed

  Enabled      Open        Open

[Image]

           CACHE CONFIGURATION

     Size        Bank 0        Bank 1

     64KB       (8) 8K x 8      NONE

    128KB       (8) 8K x 8   (8) 8K x 8

                 CACHE JUMPER CONFIGURATION

   Size       JP1       JP2       JP3       JP4       JP5

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

  128KB      2 & 3    Closed     Closed    2 & 3     2 & 3

  Note: Pins designated should be in the closed position.