MICRONICS COMPUTERS, INC.

486DX2/50 SYSTEM BOARD

Processor         80486DX2
Processor Speed   50(internal)MHz
Chip Set          Micronics
Max. Onboard DRAM 64MB (32MB on external memory board)
Cache             64/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J11       Turbo LED                  W5

  Speaker                     J23       Reset switch               W6

  Power LED & keylock         J24       Turbo switch               W7

  External keyboard           W1        32-bit external           SL1
  connector                             memory card

                        USER CONFIGURABLE SETTINGS

                Function                     Switch          Position

  »   Factory configured - do not            SW1/1              On
      alter

  »   Factory configured - do not            SW1/2             Off
      alter

  »   Factory configured - do not            SW1/3             Off
      alter

  »   I/O delay enabled                      SW1/4             Off

      I/O delay disabled                     SW1/4              On

  »   Factory configured - do not            SW1/5             Off
      alter

  »   Video BIOS cache enabled               SW1/6             Off

      Video BIOS cache disabled              SW1/6              On

  »   Factory configured - do not            SW1/7             Off
      alter

  »   Factory configured - do not            SW1/8             Off
      alter

  »   Factory configured - do not            SW2/6              On
      alter

  »   Cache enabled                          SW2/7             Off

      Cache disabled                         SW2/7              On

  »   Cache enabled                          SW2/8             Off

      Cache disabled                         SW2/8              On

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Note: Banks 2 & 3 are located on the external memory card.

                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       Off      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       Off

   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

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

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

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

                        CACHE JUMPER CONFIGURATION

      Size               W3                 W4                 W15

      64KB              Open               Open         pins 2 & 3 closed

      256KB            Closed             Closed        pins 1 & 2 closed