
MICRONICS COMPUTERS, INC.

486/25

Processor         80486DX
Processor Speed   25MHz
Chip Set          Micronics
Max. Onboard DRAM 16MB
Cache             64/128/256KB
BIOS              Phoenix
Dimensions        355mm x 304mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J2       Reset switch               W4

  Speaker                     J22       Turbo LED                  W5

  Power LED & keylock         J23       Turbo switch               W6

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper/Switch        Position

     Internal cache enabled                 SW1/1               On

      Internal cache disabled                SW1/1              Off

     On board BIOS enabled                  SW1/2              Off

      External BIOS enabled                  SW1/2               On

     Factory configured - do not            SW1/3               On
      alter

     External cache enabled                 SW1/4               On

      External cache disabled                SW1/4              Off

     BIOS relocation disabled               SW1/5              Off

      BIOS relocation enabled                SW1/5               On

     Factory configured - do not            SW1/6              Off
      alter

     Monitor type select color,             SW1/7               On
      CGA, EGA, or VGA

      Monitor type select                    SW1/7              Off
      monochrome

     Factory configured - do not            SW1/8              Off
      alter

     Factory configured - do not            SW2/5              Off
      alter

     D00000-EFFFFF cacheable                SW2/6              Off

      D00000-EFFFFF non-cacheable            SW2/6               On

     Factory configured - do not             W1                N/A
      alter

     Factory configured - do not             W2             pins 2 & 3
      alter                                                    closed

     Factory configured - do not             W3                N/A
      alter

  Note:The exact location of W2 is unknown.

                              DRAM CONFIGURATION

  Size   Bank 0   Bank 1    Bank 2    Bank 3    SW1/1   SW1/2   SW1/3   SW1/4

  1MB    (4)256K   NONE      NONE      NONE      On      On      On      On
          x 9

  2MB    (4)256K  (4)256K    NONE      NONE      Off     On      On      On
          x 9       x 9

  3MB    (4)256K  (4)256K   (4)256K    NONE      On     Off      On      On
          x 9       x 9       x 9

  4MB    (4)256K  (4)256K   (4)256K   (4)256K    Off    Off      On      On
          x 9       x 9       x 9       x 9

  4MB    (4)1M x   NONE      NONE      NONE      On      On     Off      On
           9

  5MB    (4)256K  (4)1M x    NONE      NONE      On      On     Off     Off
          x 9        9

  6MB    (4)256K  (4)256K   (4)1M x    NONE      On     Off      On     Off
          x 9       x 9        9

  7MB    (4)256K  (4)256K   (4)256K   (4)1M x    Off     On      On     Off
          x 9       x 9       x 9        9

  8MB    (4)1M x  (4)1M x    NONE      NONE      Off     On     Off      On
           9         9

  9MB    (4)256K  (4)1M x   (4)1M x    NONE      On     Off     Off     Off
          x 9        9         9

  10MB   (4)256K  (4)256K   (4)1M x    (4) 1M    Off    Off      On     Off
          x 9       x 9        9        x 9

  12MB   (4)1M x  (4)1M x   (4)1M x    NONE      On     Off     Off      On
           9         9         9

  13MB   (4)256K  (4)1M x   (4)1M x   (4)1M x    Off    Off     Off     Off
          x 9        9         9         9

  16MB   (4)1M x  (4)1M x   (4)1M x   (4)1M x    Off    Off     Off      On
           9         9         9         9

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 32K 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

  Note:The exact location of the TAG chip is unknown.

                        CACHE JUMPER CONFIGURATION

    Size         SW2/7         SW2/8            W8               W9

    64KB          Off           Off         pins 1 & 2       pins 1 & 2
                                              closed           closed

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

    256KB         Off            On         pins 2 & 3       pins 2 & 3
                                              closed           closed

