
MICRONICS COMPUTERS, INC.

486DX2 SYSTEM BOARD

Processor         80486DX2
Processor Speed   50(internal)MHz
Chip Set          Micronics
Max. Onboard DRAM 64MB
Cache             64/256KB
BIOS              Phoenix
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                    Location    Purpose                Location

  External battery             J11       Reset switch              W6

  Speaker                      J23       Turbo switch              W7

  Keylock/power LED            J24       32-bit external           S1
                                         memory card

  Turbo LED                     W5

                        USER CONFIGURABLE SETTINGS

                Function                      Switch         Position

     Factory configured-do not alter         SW1/1             On

     Factory configured-do not alter         SW1/2             Off

     Factory configured-do not alter         SW1/3             Off

     Factory configured-do not alter         SW1/4             On

     Factory configured-do not alter         SW1/5             Off

     Factory configured-do not alter         SW1/6             Off

     Factory configured-do not alter         SW1/7             Off

     Factory configured-do not alter         SW1/8             Off

     Factory configured-do not alter         SW2/6             On

     Factory configured-do not alter         SW2/7             Off

      64KB External cache select              SW2/8             Off

      256KB External cache select             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 a memory expansion card that fits in
  the 32-bit expansion slot.

                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       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

                       EXTERNAL CACHE CONFIGURATION

      Size               W3                 W4                 W15

      64KB              Open               Open         pins 2 & 3 closed

      256KB            Closed             Closed        pins 1 & 2 closed

