
MICRONICS COMPUTERS, INC.

80486 ASIC SYSTEM BOARD

Processor         80486DX
Processor Speed   33MHz
Chip Set          Micronics
Max. Onboard DRAM 64MB
Cache             64/128/256KB
BIOS              Phoenix
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  External battery           J13        Turbo LED                W9
  connector

  Speaker                    J30        Reset switch            W10

  Keylock                    J31        Turbo switch            W11

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper/Switch        Position

     Factory configured-do not              SW1/1              Off
      alter

     Factory configured-do not              SW1/2              Off
      alter

     Factory configured-do not              SW1/3              Off
      alter

     Factory configured-do not              SW1/4              Off
      alter

     Factory configured-do not              SW1/5              Off
      alter

     Factory configured-do not              SW1/6              Off
      alter

     Video BIOS cacheable                   SW1/7              Off

      Video BIOS not cacheable               SW1/7               On

     Factory configured-do not              SW1/8              Off
      alter

     70ns DRAM select                       SW2/6              Off

      80ns DRAM select                       SW2/6               On

      64KB or 256KB cache select             SW2/7              Off

      128KB cache select                     SW2/7               On

      64KB cache select                      SW2/8              Off

      128KB or 256KB cache select            SW2/8               On

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

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

     128KB       (4) 32K x 8      None

     256KB       (4) 32K x 8   (4) 32K x 8

             CACHE JUMPER CONFIGURATION

       Size              W5                W6

  128KB or 256KB       Closed              N/A

       64KB             Open               N/A

      256KB              N/A             Closed

  64KB or 128KB          N/A              Open

                            DRAM CONFIGURATION

    Size         Bank 0          Bank 1         Bank 2         Bank 3

     1MB       (4) 256KB x        NONE           NONE           NONE
                    9

     2MB       (4) 256KB x     (4) 256KB x       NONE           NONE
                    9              9

     3MB       (4) 256KB x     (4) 256KB x    (4) 256KB x       NONE
                    9              9              9

     4MB       (4) 256KB x     (4) 256KB x    (4) 256KB x   (4) 256KB x 9
                    9              9              9

     4MB       (4) 1MB X 9        NONE           NONE           NONE

     5MB       (4) 256KB x    (4) 1MB x 9        NONE           NONE
                    9

     6MB       (4) 256KB x     (4) 256KB x   (4) 1MB x 9        NONE
                    9              9

     7MB       (4) 256KB x     (4) 256KB x    (4) 256KB x    (4) 1MB x 9
                    9              9              9

     8MB       (4) 1MB x 9    (4) 1MB x 9        NONE           NONE

     9MB       (4) 256KB x    (4) 1MB x 9    (4) 1MB x 9        NONE
                    9

    10MB       (4) 256KB x     (4) 256KB x   (4) 1MB x 9     (4) 1MB x 9
                    9              9

    12MB       (4) 1MB x 9    (4) 1MB x 9    (4) 1MB x 9        NONE

    13MB       (4) 256KB x    (4) 1MB x 9    (4) 1MB x 9     (4) 1MB x 9
                    9

                      DRAM CONFIGURATION (CONTINUED)

     Size          Bank 0         Bank 1        Bank 2         Bank 3

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

     16MB       (4) 4MB x 9        NONE          NONE           NONE

     20MB       (4) 1MB x 9    (4) 4MB x 9       NONE           NONE

     24MB       (4) 1MB x 9    (4) 1MB x 9    (4) 4MB x 9       NONE

     28MB       (4) 1MB x 9    (4) 1MB x 9    (4) 1MB x 9    (4) 4MB x 9

     32MB       (4) 4MB x 9    (4) 4MB x 9       NONE           NONE

     36MB       (4) 1MB x 9    (4) 4MB x 9    (4) 4MB x 9       NONE

     40MB       (4) 1MB x 9    (4) 1MB x 9    (4) 4MB x 9    (4) 4MB x 9

     48MB       (4) 4MB x 9    (4) 4MB x 9    (4) 4MB x 9       NONE

     52MB       (4) 1MB x 9    (4) 4MB x 9    (4) 4MB x 9    (4) 4MB x 9

     64MB       (4) 4MB x 9    (4) 4MB x 9    (4) 4MB x 9    (4) 4MB x 9

                DRAM SWITCH CONFIGURATION

   Size     SW2/1     SW2/2     SW2/3     SW2/4    SW2/5

   1MB        On       On        On        On       On

   2MB       Off       On        On        On       On

   3MB        On       Off       On        On       On

   4MB       Off       Off       On        On       On

   4MB        On       On        Off       On       On

   5MB        On       On        Off       On       On

   6MB        On       Off       On        Off      On

   7MB       Off       On        On        Off      On

   8MB       Off       On        Off       On       On

   9MB        On       Off       Off       Off      On

   10MB      Off       Off       On        Off      On

   12MB       On       Off       Off       On       On

   13MB      Off       Off       Off       Off      On

   16MB      Off       Off       Off       On       On

   16MB       On       On        Off       On       Off

   20MB       On       On        Off       Off      Off

   24MB       On       Off       On        Off      Off

   28MB      Off       On        On        Off      Off

   32MB      Off       On        Off       On       Off

   36MB       On       Off       Off       Off      Off

   40MB      Off       Off       On        Off      Off

   48MB       On       Off       Off       On       Off

   52MB      Off       Off       Off       Off      Off

   64MB      Off       Off       Off       On       Off

