
MICRONICS COMPUTERS, INC.

ZIF SOCKET SYSTEM BOARD

Processor         80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed   25/33/50(internal)66/(internal)MHz
Chip Set          Intel
Max. Onboard DRAM 64MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit VESA local bus slots (2), floppy drive interface,
                  IDE interface, parallel port,

                  serial ports (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Floppy drive               CN1       Speaker                    J33
  interface

  IDE interface              CN2       Power LED & keylock        J34

  External battery            J8       IDE interface LED          W11

  External keyboard          J10       Reset switch               W12
  connector

  Serial port 1              J12       Turbo LED                  W13

  Parallel port              J15       Turbo switch               W14

  Serial port 2              J16       32-bit VESA Local bus   SL1 & SL2
                                       slots

                        USER CONFIGURABLE SETTINGS

               Function                   Jumper/Switch       Position

     Factory configured - do not             SW1/2              On
      alter

     Factory configured - do not             SW1/3              Off
      alter

     Factory configured - do not             SW1/4              Off
      alter

     Clock type select Motorola                W1              Open
      126818

      Clock type select Dallas                  W1             Closed

     Parallel port unidirectional              W5            pins 1 & 2
      (printer)                                                closed

      Parallel port bidirectional               W5            pins 2 & 3
                                                               closed

     Monitor type select color                 W6             Closed

      Monitor type select monochrome            W6              Open

     Factory configured - do not               W7              Open
      alter

     CMOS memory normal operation              W8            pins 2 & 3
                                                               closed

      CMOS memory clear                         W8            pins 1 & 2
                                                               closed

     Factory configured - do not              W20             Closed
      alter

     Factory configured - do not              W28             Closed
      alter

     Battery normal operation                 W31              Open
      (Dallas)

      Battery memory clear (Dallas)            W31             Closed

     Local bus parity enabled                 W40             Closed

      Local bus disabled                       W40              Open

     Factory configured - do not              W61              Open
      alter

     Factory configured - do not              W62              Open
      alter

     CPU type select                          W70            pins 2 & 3
      80486DX/DX2/Pentium Overdrive                            closed

      CPU type select 80486SX                  W70            pins 1 & 2
                                                               closed

     CPU type select PQFP installed           W71            pins 1 & 2
      with PGA Pentium Overdrive                               closed

      CPU type select PQFP installed           W71            pins 2 & 3
      with PGA 80486DX/DX2                                     closed

  Note: The location of jumpers W20, W28, W61 & W62 are unidentified.

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        NONE           NONE           NONE
                    36

     2MB        (1) 256K x     (1) 256K x        NONE           NONE
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        NONE
                    36             36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

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

     5MB        (1) 256K x    (1) 1M x 36        NONE           NONE
                    36

     6MB        (1) 256K x     (1) 256K x    (1) 1M x 36        NONE
                    36             36

     7MB        (1) 256K x     (1) 256K x     (1) 256K x     (1) 1M x 36
                    36             36             36

     8MB       (1) 1M x 36    (1) 1M x 36        NONE           NONE

     9MB        (1) 256K x    (1) 1M x 36    (1) 1M x 36        NONE
                    36

     10MB       (1) 256K x     (1) 256K x    (1) 1M x 36     (1) 1M x 36
                    36             36

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     13MB       (1) 256K x    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36
                    36

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     16MB      (1) 4M x 36        NONE           NONE           NONE

     20MB      (1) 1M x 36    (1) 4M x 36        NONE           NONE

                       DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     24MB       (1) 1M x 36   (1) 1M x 36    (1) 4M x 36       NONE

     28MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36    (1) 4M x 36

     32MB       (1) 4M x 36   (1) 4M x 36        NONE          NONE

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

     40MB       (1) 1M x 36   (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       NONE

     52MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

     128KB      (4) 32K x 8        NONE       (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size       W64       W65       W66       W67       W68

   64KB      1 & 2     1 & 2     2 & 3     2 & 3     1 & 2

  128KB      2 & 3     1 & 2     1 & 2     1 & 2     2 & 3

  256KB      2 & 3     2 & 3     2 & 3     2 & 3     2 & 3

  Note: Pins designated should be in the closed position.

  CPU SPEED CONFIGURATION

    Speed         SW1/1

    25MHz           On

    33MHz          Off

    50iMHz          On

    66iMHz         Off

